佐分利 亘 (サブリ ワタル)

農学研究院 基盤研究部門 生物機能化学分野准教授
Last Updated :2025/12/04

■研究者基本情報

学位

  • 博士(農学), 北海道大学, 2006年03月

Researchmap個人ページ

研究キーワード

  • 蛋白質工学
  • 応用微生物学
  • 糖質合成
  • 酵素化学
  • 応用生物化学

研究分野

  • ライフサイエンス, 応用生物化学

担当教育組織

■経歴

経歴

  • 2020年07月 - 現在
    北海道大学, 大学院農学研究院, 准教授
  • 2019年04月 - 2020年06月
    北海道大学, 大学院農学研究院, 講師
  • 2010年10月 - 2019年03月
    北海道大学, 大学院農学研究院, 助教
  • 2006年04月 - 2010年09月
    日本食品化工株式会社, 研究所, 研究員

学歴

  • 2001年04月 - 2006年03月, 北海道大学, 大学院農学研究科
  • 1997年04月 - 2001年03月, 北海道大学, 農学部, 応用生命科学科

委員歴

  • 2023年09月 - 現在
    日本応用糖質科学会, 評議員
  • 2023年05月 - 現在
    日本農芸化学会, 北海道支部庶務幹事
  • 2021年07月 - 現在
    日本応用糖質科学会, 北海道支部事務局長
  • 2017年09月 - 現在
    応用糖質科学会, Journal of Applied Glycoscience編集委員, 学協会
  • 2021年03月 - 2025年03月
    日本農芸化学会, 英文誌編集委員, 学協会
  • 2011年04月 - 2013年03月
    日本農芸化学会, 北海道支部会計幹事, 学協会

■研究活動情報

受賞

  • 2020年09月, 日本応用糖質科学会, 奨励賞               
    佐分利 亘
  • 2018年09月, 日本応用糖質科学会, ポスター賞               
    佐分利 亘
  • 2017年09月, 日本応用糖質科学会, ポスター賞               
    佐分利 亘
  • 2017年04月, Congress on Gastrointestinal Function, James Russel Award               
    佐分利 亘
  • 2016年09月, 日本応用糖質科学会, ポスター賞               
    佐分利 亘
  • 2015年03月, 日本農芸化学会, 農芸化学奨励賞               
    佐分利 亘
  • 2014年10月, 植物化学調節学会, ポスター賞               
    佐分利 亘
  • 2013年06月, 酵素応用シンポジウム, 研究奨励賞               
    佐分利 亘

論文

  • AtGH3.10 and JAR1 Produce 12-Hydroxyjasmonoyl-l-isoleucine from 12-Hydroxyjasmonic Acid in Arabidopsis thaliana.
    Katsunari Oki, Akane Enoki, Yoshitaka Yokota, Taiki Kurihara, Takafumi Shimizu, Wataru Saburi, Takayuki Tohge, Haruhide Mori, Guido Van den Ackerveken, Naoki Kitaoka, Hideyuki Matsuura
    Chembiochem : a European journal of chemical biology, e2500151, 2025年09月11日, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), Jasmonates are plant hormones that regulate plant defense and development. 7-iso-Jasmonoyl-l-isoleucine (JA-Ile) is a representative active jasmonate which is biosynthesized from 7-iso-jasmonic acid (JA) by the jasmonoyl-amido synthases JASMONATE RESISTANT 1 (JAR1) and AtGH3.10 in Arabidopsis thaliana. 12-Hydroxy-7-iso-jasmonoyl-l-isoleucine (12-OH-JA-Ile) is another active jasmonate, and 12-hydroxylation of JA-Ile is considered the major biosynthetic pathway toward 12-OH-JA-Ile. Previous report elucidated that recombinant JAR1 showed a weak activity against 12-hydroxy-7-iso-jasmonic acid (12-OH-JA). However, the direct conversion from 12-OH-JA to 12-OH-JA-Ile in planta and the enzyme activity of AtG3.10 against 12-OH-JA have never been reported. Herein, a feeding experiment with deuterated 12-OH-JA confirms the direct conversion of 12-OH-JA to 12-OH-JA-Ile in wild-type Arabidopsis plants. The conversion from 12-OH-JA to 12-OH-JA-Ile is not observed in jar1 gh3.10 double mutant, suggesting that 12-OH-JA is converted to 12-OH-JA-Ile by JAR1 and AtGH3.10. Notably, enzyme assays show that the catalytic efficiency with 12-OH-JA for AtGH3.10 is higher than those with JA for AtGH3.10 and with 12-OH-JA for JAR1. Comparative analysis of JAR1 and AtGH3.10 structures and site-directed mutation analysis reveals that Ser120 in AtGH3.10 is the key amino acid residue responsible for its high catalytic efficiency against 12-OH-JA.
  • Structural basis of transglucosylation in dextran dextrinase, a homolog of anomer-inverting GH15 glucoside hydrolases.
    Takayoshi Tagami, Wataru Saburi, Juri Sadahiro, Yuya Kumagai, Weeranuch Lang, Naohiro Matsugaki, Masayuki Okuyama, Haruhide Mori, Atsuo Kimura
    The Journal of biological chemistry, 301, 9, 110541, 110541, 2025年07月30日, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌), Bacterial exopolysaccharide, dextran, primarily composed of α-(1→6)-linked d-glucosyl residues, is synthesized from α-(1→4)-glucan dextrin or sucrose through successive anomer-retaining transglucosylation reactions by dextran dextrinase (DDase) or dextransucrase, respectively. Although the structure-function relationship of dextransucrase has been extensively studied, that of DDase remains largely unknown. Herein, we revealed the Gluconobacter oxydans DDase structural basis through biochemical and structural analyses. The DDase comprises 1,284 residues, with its N-terminal 902 residues being functionally essential. Crystal structure analysis of the minimal active DDase (Δ382C) complex with the pseudo-maltotetraose inhibitor, acarbose, revealed its homodimeric structure. A Δ382C protomer contains two β-sandwich domains, N1 and N2, and an (α/α)6-barrel domain A. Surprisingly, domains N2, A, and the helix-loop-helix connecting them structurally resemble those of bacterial anomer-inverting glucohydrolases in glycoside hydrolase family 15 (GH15). Domain N1 primarily forms intra- and inter-subunit domain interfaces. The DDase acarbose-binding residues in subsite -1 are conserved with GH15 glucohydrolases. The DDase Glu671 and Glu858 are positioned similarly to the GH15 glucohydrolase general acid and base catalysts, respectively. However, Glu858 is approximately 1.2-1.6 Å closer to the acarbose equivalent anomeric carbon, facilitating being a nucleophile catalyst in the double displacement mechanism. The catalytic residue functions were biochemically confirmed using mutant enzymes. Spatial position of Glu858 is arranged by the local structure of the α11→α12 loop and subunit interactions involving domain N1. Enzymes classified in the same GH family catalyze reactions with different mechanisms, anomer-inverting or -retaining, due to differences in their catalytic residue spatial arrangement.
  • Biochemical and structural analysis of the mechanism for the catalysis and specificity of cellobiose 2-epimerase from Rhodothermus marinus.
    Wataru Saburi, Hirohiko Muto-Fukiya, Nongluck Jaito, Koji Kato, Jian Yu, Min Yao, Haruhide Mori
    Bioscience, biotechnology, and biochemistry, 89, 7, 973, 984, 2025年03月22日, [査読有り], [筆頭著者, 責任著者], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), Cellobiose 2-epimerase (CE) catalyzes C-2 epimerization of reducing end d-glucose/d-mannose residue of β-(1→4)-disaccharides, and also slightly catalyzes aldose-ketose conversion. In this study, we investigated the structure-function relationship of Rhodothermus marinus CE (RmCEs). In 2H2O, 2H replaced the 2-H of the reducing end sugar residue, suggesting a proton abstraction-addition mechanism via the cis-enediolate intermediate. The structure of the RmCE-mannobiitol complex showed that His259 was suitable for abstracting 2-H from d-mannose residue, whereas His390 was suitable for the d-glucose residue. H259A and H390A mutations abolished activity for Galβ1-4Man and Galβ1-4Glc formation from Galβ1-4Fru, respectively, and these mutants catalyzed both epimerization and isomerization to Galβ1-4Glc and Galβ1-4Man, respectively. Ala substitution of the residues interacting with the 2-O of the reducing end sugar residue significantly reduced the velocity for epimerization, but not for isomerization. Trp385, stacked onto the non-reducing-end sugar residues of disaccharides, was shown to be important for disaccharide specificity.
  • Molecular mechanism for the substrate specificity of Arthrobacter globiformis M6 α-glucosidase CmmB, belonging to glycoside hydrolase family 13 subfamily 30
    Wataru Saburi, Takayoshi Tagami, Takuya Usui, Jian Yu, Toyoyuki Ose, Min Yao, Haruhide Mori
    Food Bioscience, 61, 104516, 104516, Elsevier BV, 2024年10月, [査読有り], [筆頭著者, 責任著者]
    研究論文(学術雑誌)
  • Comparisons of the amylolytic enzymes and malt starch hydrolysates of two barley cultivars, Hokudai 1 (the first cultivar developed in Japan) and Kitanohoshi (currently used cultivar for beer production)
    Wataru Saburi, Haruhide Mori
    Bioscience, Biotechnology, and Biochemistry, 88, 10, 1180, 1187, Oxford University Press (OUP), 2024年07月11日, [査読有り], [筆頭著者, 責任著者], [国際誌]
    英語, 研究論文(学術雑誌), Abstract

    Starch degradation in malted barley produces yeast-fermentable sugars. In this study, we compared the amylolytic enzymes and composition of the malt starch hydrolysates of two barley cultivars, Hokudai 1 (the first cultivar established in Japan) and Kitanohoshi (the currently used cultivar for beer production). Hokudai 1 malt contained lower activity of amylolytic enzymes than Kitanohoshi malt, although these cultivars contained α-amylase AMY2 and β-amylase Bmy1 as the predominant enzymes. Malt starch hydrolysate of Hokudai 1 contained more limit dextrin and less yeast-fermentable sugars than that of Kitanohoshi. In mixed malt saccharification, a high Hokudai 1 malt ratio increased the limit dextrin levels and decreased the maltotriose and maltose levels. Even though Kitanohoshi malt contained more amylolytic enzymes than Hokudai 1 malt, addition of Kitanohoshi extract containing the amylolytic enzymes did not enhance malt starch degradation of Hokudai 1. Hokudai 1 malt starch was less degradable than Kitanohoshi malt starch.
  • Extraction and antioxidant capacity of mycosporine-like amino acids from red algae in Japan.
    Ryuya Yamamoto, Shigeru Toriumi, Chikara Kawagoe, Wataru Saburi, Hideki Kishimura, Yuya Kumagai
    Bioscience, biotechnology, and biochemistry, 88, 7, 830, 838, 2024年04月29日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Mycosporine-like amino acids (MAAs) are the natural UV absorbing compounds with antioxidant activity found in microalgae and macroalgae. We collected red algae Asparagopsis taxiformis, Meristotheca japonica, and Polysiphonia senticulosa from Nagasaki, where UV radiation is more intense than in Hokkaido, and investigated the effect of UV radiation on MAAs content. It was suggested that A. taxiformis and M. japonica contained shinorine and palythine, while UV absorbing compound in P. senticulosa could not be identified. The amounts of these MAAs were lower compared to those from Hokkaido. Despite an increase in UV radiation in both region from February to April, MAAs contents of red algae from Nagasaki slightly decreased, while that from Hokkaido significantly decreased. This difference was suggested the amount of inorganic nitrogen in the ocean. Antioxidant activity of MAAs increased under alkaline conditions. The extract containing MAAs from P. senticulosa showed the highest antioxidant activity among four red algae.
  • Tunable structure of chimeric isomaltomegalosaccharides with double α-(1 → 4)-glucosyl chains enhances the solubility of water-insoluble bioactive compounds
    Weeranuch Lang, Takayoshi Tagami, Yuya Kumagai, Seiya Tanaka, Hye-Jin Kang, Masayuki Okuyama, Wataru Saburi, Haruhide Mori, Tohru Hira, Chaehun Lee, Takuya Isono, Toshifumi Satoh, Hiroshi Hara, Takayuki Kurokawa, Nobuo Sakairi, Yoshiaki Yuguchi, Atsuo Kimura
    Carbohydrate Polymers, 319, 121185, 121185, Elsevier BV, 2023年11月, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), Isomaltomegalosaccharides with α-(1 → 4) and α-(1 → 6)-segments solubilize water-insoluble ligands since the former complexes with the ligand and the latter solubilizes the complex. Previously, we enzymatically synthesized isomaltomegalosaccharide with a single α-(1 → 4)-segment at the reducing end (S-IMS) by dextran dextrinase (DDase), but the chain length [average degree of polymerization (DP) ≤ 9] was insufficient for strong encapsulation. We hypothesized that the conjugation of longer α-(1 → 4)-segment afforded the promising function although DDase is incapable to do so. In this study, the cyclodextrin glucanotransferase-catalyzed coupling reaction of α-cyclodextrin to S-IMS synthesized a new α-(1 → 4)-segment at the nonreducing end (N-4S) of S-IMS to form D-IMS [IMS harboring double α-(1 → 4)-segments]. The length of N-4S was modulated by the ratio between α-cyclodextrin and S-IMS, generating N-4Ss with DPs of 7-50. Based on phase-solubility analysis, D-IMS-28.3/13/3 bearing amylose-like helical N-4S with DP of 28.3 displayed a water-soluble complex with aromatic drugs and curcumin. Small-angle X-ray scattering revealed the chain adapted to rigid in solution in which the radius of gyration was estimated to 2.4 nm. Furthermore, D-IMS with short N-4S solubilized flavonoids of less-soluble multifunctional substances. In our research, enzyme-generated functional biomaterials from DDase were developed to maximize the hydrophobic binding efficacy towards water-insoluble bioactive compounds.
  • Molecular mechanism for endo-type action of glycoside hydrolase family 55 endo-β-1,3-glucanase on β1-3/1-6-glucan.
    Tomoya Ota, Wataru Saburi, Takayoshi Tagami, Jian Yu, Shiro Komba, Linda Elizabeth Jewell, Tom Hsiang, Ryozo Imai, Min Yao, Haruhide Mori
    The Journal of biological chemistry, 299, 11, 105294, 105294, 2023年09月27日, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), The glycoside hydrolase family 55 (GH55) includes inverting exo-β-1,3-glucosidases and endo-β-1,3-glucanases, acting on laminarin, which is a β1-3/1-6-glucan consisting of a β1-3/1-6-linked main chain and β1-6-linked branches. Despite their different modes of action toward laminarin, endo-β-1,3-glucanases share with exo-β-1,3-glucosidases conserved residues that form the dead-end structure of subsite -1. Here, we investigated the mechanism of endo-type action on laminarin by GH55 endo-β-1,3-glucanase MnLam55A, identified from Microdochium nivale. MnLam55A, like other endo-β-1,3-glucanases, degraded internal β-d-glucosidic linkages of laminarin, producing more reducing sugars than the sum of d-glucose and gentiooligosaccharides detected. β1-3-Glucans lacking β1-6-linkages in the main chain were not hydrolyzed. NMR analysis of the initial degradation of laminarin revealed that MnLam55A preferentially cleaved the non-reducing terminal β1-3-linkage of the laminarioligosaccharide moiety at the reducing end side of the main chain β1-6-linkage. MnLam55A liberates d-glucose from laminaritriose and longer laminarioligosaccharides, but kcat/Km values to laminarioligosaccharides (≤4.21 s-1mM-1) were much lower than to laminarin (5,920 s-1mM-1). These results indicate that β-glucan binding to the minus subsites of MnLam55A, including exclusive binding of the gentiobiosyl moiety to subsites -1 and -2, is required for high hydrolytic activity. A crystal structure of MnLam55A, determined at 2.4 Å resolution, showed that MnLam55A adopts an overall structure and catalytic site similar to those of exo-β-1,3-glucosidases. However, MnLam55A possesses an extended substrate-binding cleft that is expected to form the minus subsites. Sequence comparison suggested that other endo-type enzymes share the extended cleft structure. The specific hydrolysis of internal linkages in laminarin is presumably common to GH55 endo-β-1,3-glucanases.
  • Hydrolysis-transglycosylation of sucrose and production of β-(2→1)-fructan by inulosucrase from Neobacillus drentensis 57N.
    Yusuke Kido, Wataru Saburi, Taizo Nagura, Haruhide Mori
    Bioscience, biotechnology, and biochemistry, 87, 10, 1169, 1182, 2023年09月21日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Inulin, β-(2→1)-fructan, is a beneficial polysaccharide used as a functional food ingredient. Microbial inulosucrases (ISs), catalyzing β-(2→1)-transfructosylation, produce β-(2→1)-fructan from sucrose. In this study, we identified a new IS (NdIS) from the soil isolate, Neobacillus drentensis 57N. Sequence analysis revealed that, like other Bacillaceae ISs, NdIS consists of a glycoside hydrolase family 68 domain and shares most of the 1-kestose-binding residues of the archaeal IS, InuHj. Native and recombinant NdIS were characterized. NdIS is a homotetramer. It does not require calcium for activity. High performance liquid chromatography and 13C-nuclear magnetic resonance indicated that NdIS catalyzed the hydrolysis and β-(2→1)-transfructosylation of sucrose to synthesize β-(2→1)-fructan with chain lengths of 42 or more residues. The rate dependence on sucrose concentration followed hydrolysis-transglycosylation kinetics, and a 50% transglycosylation ratio was obtained at 344 m m sucrose. These results suggest that transfructosylation from sucrose to β-(2→1)-fructan occurs predominantly to elongate the fructan chain because sucrose is an unfavorable acceptor.
  • Chemical synthesis of oligosaccharide derivatives with partial structure of β1-3/1-6 glucan, using monomeric units for the formation of β1-3 and β1-6 glucosidic linkages.
    Tomoya Ota, Wataru Saburi, Shiro Komba, Haruhide Mori
    Bioscience, biotechnology, and biochemistry, 87, 10, 1111, 1121, 2023年07月05日, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), β1-3/1-6 Glucans, known for their diverse structures, comprise a β1-3-linked main chain and β1-6-linked short branches. Laminarin, a β1-3/1-6 glucan extracted from brown seaweed, for instance, includes β1-6 linkages even in the main chain. The diverse structures provide various beneficial functions of the glucan. To investigate the relationship between structure and functionality, and to enable the characterization of β1-3/1-6 glucan-metabolizing enzymes, oligosaccharides containing exact structures of β1-3/1-6 glucans are required. We synthesized the monomeric units for the synthesis of β1-3/1-6 mixed-linked glucooligosaccharides. 2-(Trimethylsilyl)ethyl 2-O-benzoyl-4,6-O-benzylidene-β-d-glucopyranoside served as an acceptor in the formation of β1-3 linkages. Phenyl 2-O-benzoyl-4,6-O-benzylidene-3-O-(tert-butyldiphenylsilyl)-1-thio-β-d-glucopyranoside and phenyl 2,3-di-O-benzoyl-4,6-di-O-levulinyl-1-thio-β-d-glucopyranoside acted as donors, synthesizing acceptors suitable for the formation of β1-3- and β1-6-linkages, respectively. These were used to synthesize a derivative of Glcβ1-6Glcβ1-3Glcβ1-3Glc, demonstrating that the proposed route can be applied to synthesize the main chain of β-glucan, with the inclusion of both β1-3 and β1-6 linkages.
  • Structural insights into the substrate specificity and activity of a novel mannose 2-epimerase from Runella slithyformis.
    Hang Wang, Xiaomei Sun, Wataru Saburi, Saki Hashiguchi, Jian Yu, Toyoyuki Ose, Haruhide Mori, Min Yao
    Acta crystallographica. Section D, Structural biology, 79, Pt 7, 585, 595, 2023年07月01日, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), Mannose 2-epimerase (ME), a member of the acylglucosamine 2-epimerase (AGE) superfamily that catalyzes epimerization of D-mannose and D-glucose, has recently been characterized to have potential for D-mannose production. However, the substrate-recognition and catalytic mechanism of ME remains unknown. In this study, structures of Runella slithyformis ME (RsME) and its D254A mutant [RsME(D254A)] were determined in their apo forms and as intermediate-analog complexes [RsME-D-glucitol and RsME(D254A)-D-glucitol]. RsME possesses the (α/α)6-barrel of the AGE superfamily members but has a unique pocket-covering long loop (loopα7-α8). The RsME-D-glucitol structure showed that loopα7-α8 moves towards D-glucitol and closes the active pocket. Trp251 and Asp254 in loopα7-α8 are only conserved in MEs and interact with D-glucitol. Kinetic analyses of the mutants confirmed the importance of these residues for RsME activity. Moreover, the structures of RsME(D254A) and RsME(D254A)-D-glucitol revealed that Asp254 is vital for binding the ligand in a correct conformation and for active-pocket closure. Docking calculations and structural comparison with other 2-epimerases show that the longer loopα7-α8 in RsME causes steric hindrance upon binding to disaccharides. A detailed substrate-recognition and catalytic mechanism for monosaccharide-specific epimerization in RsME has been proposed.
  • Identification and characterization of extracellular GH3 β-glucosidase from the pink snow mold fungus, Microdochium nivale.
    Tomoya Ota, Wataru Saburi, Linda Elizabeth Jewell, Tom Hsiang, Ryozo Imai, Haruhide Mori
    Bioscience, biotechnology, and biochemistry, 87, 7, 707, 716, 2023年06月23日, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), Glycoside hydrolase family 3 (GH3) β-glucosidase exists in many filamentous fungi. In phytopathogenic fungi, it is involved in fungal growth and pathogenicity. Microdochium nivale is a severe phytopathogenic fungus of grasses and cereals and is the causal agent of pink snow mold, but its β-glucosidase has not been identified. In this study, a GH3 β-glucosidase of M. nivale (MnBG3A) was identified and characterized. Among various p-nitrophenyl β-glycosides, MnBG3A showed activity on d-glucoside (pNP-Glc) and slight activity on d-xyloside. In the pNP-Glc hydrolysis, substrate inhibition occurred (Kis = 1.6 m m), and d-glucose caused competitive inhibition (Ki = 0.5 m m). MnBG3A acted on β-glucobioses with β1-3, -6, -4, and -2 linkages, in descending order of kcat/Km. In contrast, the regioselectivity for newly formed products was limited to β1-6 linkage. MnBG3A has similar features to those of β-glucosidases from Aspergillus spp., but higher sensitivity to inhibitory effects.
  • Alteration of Substrate Specificity and Transglucosylation Activity of GH13_31 α-Glucosidase from Bacillus sp. AHU2216 through Site-Directed Mutagenesis of Asn258 on β→α Loop 5
    Waraporn Auiewiriyanukul, Wataru Saburi, Tomoya Ota, Jian Yu, Koji Kato, Min Yao, Haruhide Mori
    Molecules, 28, 7, 3109, 3109, MDPI AG, 2023年03月30日, [査読有り], [責任著者], [国際誌]
    英語, 研究論文(学術雑誌), α-Glucosidase catalyzes the hydrolysis of α-d-glucosides and transglucosylation. Bacillus sp. AHU2216 α-glucosidase (BspAG13_31A), belonging to the glycoside hydrolase family 13 subfamily 31, specifically cleaves α-(1→4)-glucosidic linkages and shows high disaccharide specificity. We showed previously that the maltose moiety of maltotriose (G3) and maltotetraose (G4), covering subsites +1 and +2 of BspAG13_31A, adopts a less stable conformation than the global minimum energy conformation. This unstable d-glucosyl conformation likely arises from steric hindrance by Asn258 on β→α loop 5 of the catalytic (β/α)8-barrel. In this study, Asn258 mutants of BspAG13_31A were enzymatically and structurally analyzed. N258G/P mutations significantly enhanced trisaccharide specificity. The N258P mutation also enhanced the activity toward sucrose and produced erlose from sucrose through transglucosylation. N258G showed a higher specificity to transglucosylation with p-nitrophenyl α-d-glucopyranoside and maltose than the wild type. E256Q/N258G and E258Q/N258P structures in complex with G3 revealed that the maltose moiety of G3 bound at subsites +1 and +2 adopted a relaxed conformation, whereas a less stable conformation was taken in E256Q. This structural difference suggests that stabilizing the G3 conformation enhances trisaccharide specificity. The E256Q/N258G-G3 complex formed an additional hydrogen bond between Met229 and the d-glucose residue of G3 in subsite +2, and this interaction may enhance transglucosylation.
  • Function and structure of Lacticaseibacillus casei GH35 β-galactosidase LBCZ_0230 with high hydrolytic activity to lacto-N-biose I and galacto-N-biose
    Saburi Wataru, Tomoya Ota, Koji Kato, Takayoshi Tagami, Keitaro Yamashita, Min Yao, Haruhide Mori
    Journal of Applied Glycoscience, 70, 2, 43, 52, The Japanese Society of Applied Glycoscience, 2023年03月11日, [査読有り], [筆頭著者, 責任著者], [国内誌]
    英語, 研究論文(学術雑誌), β-Galactosidase (EC 3.2.1.23) hydrolyzes β-D-galactosidic linkages at the non-reducing end of substrates to produce β-D-galactose. Lacticaseibacillus casei is one of the most widely utilized probiotic species of lactobacilli. It possesses a putative β-galactosidase belonging to glycoside hydrolase family 35 (GH35). This enzyme is encoded by the gene included in the gene cluster for utilization of lacto-N-biose I (LNB; Galβ1-3GlcNAc) and galacto-N-biose (GNB; Galβ1-3GalNAc) via the phosphoenolpyruvate: sugar phosphotransferase system. The GH35 protein (GnbG) from L. casei BL23 is predicted to be 6-phospho-β-galactosidase (EC 3.2.1.85). However, its 6-phospho-β-galactosidase activity has not yet been examined, whereas its hydrolytic activity against LNB and GNB has been demonstrated. In this study, L. casei JCM1134 LBCZ_0230, homologous to GnbG, was characterized enzymatically and structurally. A recombinant LBCZ_0230, produced in Escherichia coli, exhibited high hydrolytic activity toward o-nitrophenyl β-D-galactopyranoside, p-nitrophenyl β-D-galactopyranoside, LNB, and GNB, but not toward o-nitrophenyl 6-phospho-β-D-galactopyranoside. Crystal structure analysis indicates that the structure of subsite -1 of LBCZ_0230 is very similar to that of Streptococcus pneumoniae β-galactosidase BgaC and not suitable for binding to 6-phospho-β-D-galactopyranoside. These biochemical and structural analyses indicate that LBCZ_0230 is a β-galactosidase. According to the prediction of LNB's binding mode, aromatic residues, Trp190, Trp240, Trp243, Phe244, and Tyr458, form hydrophobic interactions with N-acetyl-D-glucosamine residue of LNB at subsite +1.
  • Discovery of solabiose phosphorylase and its application for enzymatic synthesis of solabiose from sucrose and lactose
    Wataru Saburi, Takanori Nihira, Hiroyuki Nakai, Motomitsu Kitaoka, Haruhide Mori
    Scientific Reports, 12, 1, 259, 259, Springer Science and Business Media LLC, 2022年12月, [査読有り], [筆頭著者, 責任著者], [国際誌]
    英語, 研究論文(学術雑誌), AbstractGlycoside phosphorylases (GPs), which catalyze the reversible phosphorolysis of glycosides, are promising enzymes for the efficient production of glycosides. Various GPs with new catalytic activities are discovered from uncharacterized proteins phylogenetically distant from known enzymes in the past decade. In this study, we characterized Paenibacillus borealis PBOR_28850 protein, belonging to glycoside hydrolase family 94. Screening of acceptor substrates for reverse phosphorolysis, in which α-d-glucose 1-phosphate was used as the donor substrate, revealed that the recombinant PBOR_28850 produced in Escherichia coli specifically utilized d-galactose as an acceptor and produced solabiose (β-d-Glcp-(1 → 3)-d-Gal). This indicates that PBOR_28850 is a new GP, solabiose phosphorylase. PBOR_28850 catalyzed the phosphorolysis and synthesis of solabiose through a sequential bi-bi mechanism involving the formation of a ternary complex. The production of solabiose from lactose and sucrose has been established. Lactose was hydrolyzed to d-galactose and d-glucose by β-galactosidase. Phosphorolysis of sucrose and synthesis of solabiose were then coupled by adding sucrose, sucrose phosphorylase, and PBOR_28850 to the reaction mixture. Using 210 mmol lactose and 280 mmol sucrose, 207 mmol of solabiose was produced. Yeast treatment degraded the remaining monosaccharides and sucrose without reducing solabiose. Solabiose with a purity of 93.7% was obtained without any chromatographic procedures.
  • Functional characterization of a novel GH94 glycoside phosphorylase, 3-O-β-d-glucopyranosyl β-d-glucuronide phosphorylase, and implication of the metabolic pathway of acidic carbohydrates in Paenibacillus borealis.
    Naoto Isono, Emi Mizutani, Haruka Hayashida, Hirotaka Katsuzaki, Wataru Saburi
    Biochemical and biophysical research communications, 625, 60, 65, 2022年10月15日, [査読有り], [最終著者], [国際誌]
    英語, 研究論文(学術雑誌), Glycoside hydrolase family 94 (GH94) contains enzymes that reversibly catalyze the phosphorolysis of β-glycosides. We conducted this study to investigate a GH94 protein (PBOR_13355) encoded in the genome of Paenibacillus borealis DSM 13188 with low sequence identity to known phosphorylases. Screening of acceptor substrates for reverse phosphorolysis in the presence of α-d-glucose 1-phosphate as a donor substrate showed that PBOR_13355 utilized d-glucuronic acid and p-nitrophenyl β-d-glucuronide as acceptors. In the reaction with d-glucuronic acid, 3-O-β-d-glucopyranosyl-d-glucuronic acid was synthesized. PBOR_13355 showed a higher apparent catalytic efficiency to p-nitrophenyl β-d-glucuronide than to d-glucuronic acid, and thus, PBOR_13355 was concluded to be a novel glycoside phosphorylase, 3-O-β-d-glucopyranosyl β-d-glucuronide phosphorylase. PBOR_13360, encoded by the gene immediately downstream of the PBOR_13355 gene, was shown to be β-glucuronidase. Collectively, PBOR_13355 and PBOR_13360 are predicted to work together in the cytosol to metabolize oligosaccharides containing the 3-O-β-d-glucopyranosyl β-d-glucuronide structure released from bacterial and plant acidic carbohydrates.
  • Characterization of Antioxidant Activity of Heated Mycosporine-like Amino Acids from Red Alga Dulse Palmaria palmata in Japan.
    Yuki Nishida, Wataru Saburi, Yoshikatsu Miyabe, Hideki Kishimura, Yuya Kumagai
    Marine drugs, 20, 3, 2022年03月01日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), We recently demonstrated the monthly variation and antioxidant activity of mycosporine-like amino acids (MAAs) from red alga dulse in Japan. The antioxidant activity of MAAs in acidic conditions was low compared to that in neutral and alkali conditions, but we found strong antioxidant activity from the heated crude MAA fraction in acidic conditions. In this study, we identified and characterized the key compounds involved in the antioxidant activity of this fraction. We first isolated two MAAs, palythine, and porphyra-334, from the fraction and evaluated the activities of the two MAAs when heated. MAAs possess absorption maxima at around 330 nm, while the heated MAAs lost this absorption. The heated MAAs showed a high ABTS radical scavenging activity at pH 5.8-8.0. We then determined the structure of heated palythine via ESI-MS and NMR analyses and speculated about the putative antioxidant mechanism. Finally, a suitable production condition of the heated compounds was determined at 120 °C for 30 min at pH 8.0. We revealed compounds from red algae with antioxidant activities at a wide range of pH values, and this information will be useful for the functional processing of food.
  • Substrate specificity of glycoside hydrolase family 1 β-glucosidase AtBGlu42 from Arabidopsis thaliana and its molecular mechanism.
    Shu Horikoshi, Wataru Saburi, Jian Yu, Hideyuki Matsuura, James R Ketudat Cairns, Min Yao, Haruhide Mori
    Bioscience, biotechnology, and biochemistry, 86, 2, 231, 245, 2022年01月24日, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), Plants possess many glycoside hydrolase family 1 (GH1) β-glucosidases, which physiologically function in cell wall metabolism and activation of bioactive substances, but most remain uncharacterized. One GH1 isoenzyme AtBGlu42 in Arabidopsis thaliana has been identified to hydrolyze scopolin using the gene deficient plants, but no enzymatic properties were obtained. Its sequence similarity to another functionally characterized enzyme Os1BGlu4 in rice suggests that AtBGlu42 also acts on oligosaccharides. Here, we show that the recombinant AtBGlu42 possesses high kcat/Km not only on scopolin, but also on various β-glucosides, cellooligosaccharides, and laminarioligosaccharides. Of the cellooligosaccharides, cellotriose was the most preferred. The crystal structure, determined at 1.7 Å resolution, suggests that Arg342 gives unfavorable binding to cellooligosaccharides at subsite +3. The mutants R342Y and R342A showed the highest preference on cellotetraose or cellopentaose with increased affinities at subsite +3, indicating that the residues at this position have an important role for chain length specificity.
  • A practical approach to producing isomaltomegalosaccharide using dextran dextrinase from Gluconobacter oxydans ATCC 11894.
    Weeranuch Lang, Yuya Kumagai, Juri Sadahiro, Wataru Saburi, Rakrudee Sarnthima, Takayoshi Tagami, Masayuki Okuyama, Haruhide Mori, Nobuo Sakairi, Doman Kim, Atsuo Kimura
    Applied microbiology and biotechnology, 106, 2, 689, 698, 2022年01月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Dextran dextrinase (DDase) catalyzes formation of the polysaccharide dextran from maltodextrin. During the synthesis of dextran, DDase also generates the beneficial material isomaltomegalosaccharide (IMS). The term megalosaccharide is used for a saccharide having DP = 10-100 or 10-200 (DP, degree of polymerization). IMS is a chimeric glucosaccharide comprising α-(1 → 6)- and α-(1 → 4)-linked portions at the nonreducing and reducing ends, respectively, in which the α-(1 → 4)-glucosyl portion originates from maltodextrin of the substrate. In this study, IMS was produced by a practical approach using extracellular DDase (DDext) or cell surface DDase (DDsur) of Gluconobacter oxydans ATCC 11894. DDsur was the original form, so we prepared DDext via secretion from intact cells by incubating with 0.5% G6/G7 (maltohexaose/maltoheptaose); this was followed by generation of IMS from various concentrations of G6/G7 substrate at different temperatures for 96 h. However, IMS synthesis by DDext was limited by insufficient formation of α-(1 → 6)-glucosidic linkages, suggesting that DDase also catalyzes elongation of α-(1 → 4)-glucosyl chain. For production of IMS using DDsur, intact cells bearing DDsur were directly incubated with 20% G6/G7 at 45 °C by optimizing conditions such as cell concentration and agitation efficiency, which resulted in generation of IMS (average DP = 14.7) with 61% α-(1 → 6)-glucosyl content in 51% yield. Increases in substrate concentration and agitation efficiency were found to decrease dextran formation and increase IMS production, which improved the reaction conditions for DDext. Under modified conditions (20% G6/G7, agitation speed of 100 rpm at 45 °C), DDext produced IMS (average DP = 14.5) with 65% α-(1 → 6)-glucosyl content in a good yield of 87%. KEY POINTS: • Beneficial IMS was produced using thermostabilized DDase. • Optimum conditions for reduced dextran formation were successfully determined. • A practical approach was established to provide IMS with a great yield of 87%.
  • A Ubiquitously Expressed UDP-Glucosyltransferase, UGT74J1, Controls Basal Salicylic Acid Levels in Rice.
    Daisuke Tezuka, Hideyuki Matsuura, Wataru Saburi, Haruhide Mori, Ryozo Imai
    Plants (Basel, Switzerland), 10, 9, 2021年09月10日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Salicylic acid (SA) is a phytohormone that regulates a variety of physiological and developmental processes, including disease resistance. SA is a key signaling component in the immune response of many plant species. However, the mechanism underlying SA-mediated immunity is obscure in rice (Oryza sativa). Prior analysis revealed a correlation between basal SA level and blast resistance in a range of rice varieties. This suggested that resistance might be improved by increasing basal SA level. Here, we identified a novel UDP-glucosyltransferase gene, UGT74J1, which is expressed ubiquitously throughout plant development. Mutants of UGT74J1 generated by genome editing accumulated high levels of SA under non-stressed conditions, indicating that UGT74J1 is a key enzyme for SA homeostasis in rice. Microarray analysis revealed that the ugt74j1 mutants constitutively overexpressed a set of pathogenesis-related (PR) genes. An inoculation assay demonstrated that these mutants had increased resistance against rice blast, but they also exhibited stunted growth phenotypes. To our knowledge, this is the first report of a rice mutant displaying SA overaccumulation.
  • β-(1→4)-Mannobiose Acts as an Immunostimulatory Molecule in Murine Dendritic Cells by Binding the TLR4/MD-2 Complex.
    Ting-Yu Cheng, Yen-Ju Lin, Wataru Saburi, Stefan Vieths, Stephan Scheurer, Stefan Schülke, Masako Toda
    Cells, 10, 7, 2021年07月14日, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌), Some β-mannans, including those in coffee bean and soy, contain a mannose backbone with β-(1→4) bonds. Such mannooligosaccharides could have immunological functions involving direct interaction with immune cells, in addition to acting as prebiotics. This study aimed at assessing the immunological function of mannooligosaccharides with β-(1→4) bond, and elucidating their mechanism of action using bone marrow-derived murine dendritic cells (BMDCs). When BMDCs were stimulated with the mannooligosaccharides, only β-Man-(1→4)-Man significantly induced production of cytokines that included IL-6, IL-10, TNF-α, and IFN-β, and enhanced CD4+ T-cell stimulatory capacity. Use of putative receptor inhibitors revealed the binding of β-Man-(1→4)-Man to TLR4/MD2 complex and involvement with the complement C3a receptor (C3aR) for BMDC activation. Interestingly, β-Man-(1→4)-Man prolonged the production of pro-inflammatory cytokines (IL-6 and TNF-α), but not of the IL-10 anti-inflammatory cytokine during extended culture of BMDCs, associated with high glucose consumption. The results suggest that β-Man-(1→4)-Man is an immunostimulatory molecule, and that the promotion of glycolysis could be involved in the production of pro-inflammatory cytokine in β-Man-(1→4)-Man-stimulated BMDCs. This study could contribute to development of immune-boosting functional foods and a novel vaccine adjuvant.
  • A model system for studying plant-microbe interactions under snow.
    Chikako Kuwabara, Kentaro Sasaki, Natsuki Umeki, Tamotsu Hoshino, Wataru Saburi, Hirokazu Matsui, Ryozo Imai
    Plant physiology, 185, 4, 1489, 1494, 2021年02月02日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), A model plant–pathogen system using Arabidopsis and its natural snow mold pathogen Typhula ishikariensis demonstrated Arabidopsis plants develop disease resistance through cold acclimation.
  • Preliminary evaluation of colorimetric and HPLC-based methods for quantifying β-(1→4)-mannobiose in a crude material
    Kensuke Fukui, Wataru Saburi, Masahisa Ibuki, Kazunobu Tsumura, Haruhide Mori
    Food Science and Technology Research, 27, 2, 249, 257, Japanese Society for Food Science and Technology, 2021年, [査読有り]
    研究論文(学術雑誌)
  • Efficient one-pot enzymatic synthesis of trehalose 6-phosphate using GH65 α-glucoside phosphorylases.
    Yodai Taguchi, Wataru Saburi, Ryozo Imai, Haruhide Mori
    Carbohydrate research, 488, 107902, 107902, 2020年02月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Trehalose 6-phosphate (Tre6P) is an important intermediate for trehalose biosynthesis. Recent researches have revealed that Tre6P is an endogenous signaling molecule that regulates plant development and stress responses. The necessity of Tre6P in physiological studies is expected to be increasing. To achieve the cost-effective production of Tre6P, a novel approach is required. In this study, we utilized trehalose 6-phosphate phosphorylase (TrePP) from Lactococcus lactis to produce Tre6P. In the reverse phosphorolysis by the TrePP, 91.9 mM Tre6P was produced from 100 mM β-glucose 1-phosphate (β-Glc1P) and 100 mM glucose 6-phosphate (Glc6P). The one-pot reaction of TrePP and maltose phosphorylase (MP) enabled production of 65 mM Tre6P from 100 mM maltose, 100 mM Glc6P, and 20 mM inorganic phosphate. Addition of β-phosphoglucomutase to this reaction produced Glc6P from β-Glc1P and thus reduced requirement of Glc6P as a starting material. Within the range of 20-469 mM inorganic phosphate tested, the 54 mM concentration yielded the highest amount of Tre6P (33 mM). Addition of yeast increased the yield because of its glucose consumption. Finally, from 100 mmol maltose and 60 mmol inorganic phosphate, we successfully achieved production of 37.5 mmol Tre6P in a one-pot reaction (100 mL), and 9.4 g Tre6P dipotassium salt was obtained.
  • Two binding proteins of the ABC transporter that confers growth of Bifidobacterium animalis subsp. lactis ATCC27673 on β-mannan possess distinct manno-oligosaccharide-binding profiles.
    M Ejby, A Guskov, M J Pichler, G C Zanten, E Schoof, W Saburi, D J Slotboom, M Abou Hachem
    Molecular microbiology, 112, 1, 114, 130, 2019年07月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Human gut bifidobacteria rely on ATP-binding cassette (ABC) transporters for oligosaccharide uptake. Multiple oligosaccharide-specific solute-binding protein (SBP) genes are occasionally associated with a single ABC transporter, but the significance of this multiplicity remains unclear. Here, we characterize BlMnBP1 and BlMnBP2, the two SBPs associated to the β-manno-oligosaccharide (MnOS) ABC transporter in Bifidobacterium animalis subsp. lactis. Despite similar overall specificity and preference to mannotriose (Kd ≈80 nM), affinity of BlMnBP1 is up to 2570-fold higher for disaccharides than BlMnBP2. Structural analysis revealed a substitution of an asparagine that recognizes the mannosyl at position 2 in BlMnBP1, by a glycine in BlMnBP2, which affects substrate affinity. Both substitution types occur in bifidobacterial SBPs, but BlMnBP1-like variants prevail in human gut isolates. B. animalis subsp. lactis ATCC27673 showed growth on gluco and galactomannans and was able to outcompete a mannan-degrading Bacteroides ovatus strain in co-cultures, attesting the efficiency of this ABC uptake system. By contrast, a strain that lacks this transporter failed to grow on mannan. This study highlights SBP diversification as a possible strategy to modulate oligosaccharide uptake preferences of bifidobacterial ABC-transporters during adaptation to specific ecological niches. Efficient metabolism of galactomannan by distinct bifidobacteria, merits evaluating this plant glycan as a potential prebiotic.
  • Biochemical characteristics of maltose phosphorylase MalE from Bacillus sp. AHU2001 and chemoenzymatic synthesis of oligosaccharides by the enzyme.
    Gao Y, Saburi W, Taguchi Y, Mori H
    Bioscience, biotechnology, and biochemistry, 83, 2097, 2109, 2019年07月, [査読有り], [国際誌]
  • Enzymatic characteristics of D-mannose 2-epimerase, a new member of the acylglucosamine 2-epimerase superfamily.
    Saburi W, Sato S, Hashiguchi S, Muto H, Iizuka T, Mori H
    Applied microbiology and biotechnology, 2019年06月, [査読有り], [筆頭著者], [国際誌]
  • Enzymatic production of xylooligosaccharides from red alga dulse (Palmaria sp.) wasted in Japan {IF:2.616]
    Y.Yamamoto, H.Kishimura, Y.Kinoshita, W.Saburi, Y.Kumagai, H.Yasui, T.Ojima
    Process Biochemistry, 2019年04月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • The rice ethylene response factor OsERF83 positively regulates disease resistance to Magnaporthe oryzae.
    Tezuka D, Kawamata A, Kato H, Saburi W, Mori H, Imai R
    Plant physiology and biochemistry : PPB, 135, 263, 271, Elsevier BV, 2019年02月, [査読有り], [国際誌]
    研究論文(学術雑誌)
  • Functional modulation of caecal fermentation and microbiota in rat by feeding bean husk as a dietary fibre supplement.
    Myint H, Kishi H, Iwahashi Y, Saburi W, Koike S, Kobayashi Y
    Beneficial microbes, 9, 6, 1, 12, Wageningen Academic Publishers, 2018年09月, [査読有り], [国際誌]
    研究論文(学術雑誌), A feeding study using rats was conducted to evaluate the utility of lablab bean husk and soya bean husk as sources of potential prebiotic fibre. Twenty 5-week-old Sprague Dawley rats were divided into 4 groups and fed one of the following diets for 3 weeks: purified diet (AIN93 G) containing 5% cellulose (CEL), or the same diet in which cellulose was replaced by corn starch (STA), lablab bean husk (LBH), or soya bean husk (SBH). Rats were sacrificed at 8 weeks of age and caecal digesta were collected. Feed intake, body weight, anatomical parameters, and caecal ammonia level did not differ significantly among diets. Rats on LBH and SBH showed higher concentrations of caecal short-chain fatty acid and lactate than those on CEL. Rats on CEL, SBH, and LBH exhibited lower caecal indole and skatole levels. LBH yielded increased caecal abundance of Akkermansia muciniphila and Oscillibacter relatives, as demonstrated by either qPCR, MiSeq, or clone library analysis. SBH favoured the growth of lactobacilli as assessed by both qPCR and MiSeq, and favoured the growth of bifidobacteria as assessed by MiSeq. In comparison with STA, LBH and SBH yielded lower caecal abundance of bacteria related to Dorea massiliensis, as demonstrated by qPCR, MiSeq, and clone library analysis. Both types of bean husk were found to contain oligosaccharides that might selectively stimulate the growth of beneficial bacteria. Based on these results, the two species of bean husk tested are considered potentially functional for promoting the gut health of monogastric animals.
  • A Transposon Mutagenesis System for Bifidobacterium longum subsp. longum Based on an IS3 Family Insertion Sequence, ISBlo11.
    Mikiyasu Sakanaka, Shingo Nakakawaji, Shin Nakajima, Satoru Fukiya, Arisa Abe, Wataru Saburi, Haruhide Mori, Atsushi Yokota
    Applied and environmental microbiology, 84, 17, 2018年09月01日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Bifidobacteria are a major component of the intestinal microbiota in humans, particularly breast-fed infants. Therefore, elucidation of the mechanisms by which these bacteria colonize the intestine is desired. One approach is transposon mutagenesis, a technique currently attracting much attention because, in combination with next-generation sequencing, it enables exhaustive identification of genes that contribute to microbial fitness. We now describe a transposon mutagenesis system for Bifidobacterium longum subsp. longum 105-A (JCM 31944) based on ISBlo11, a native IS3 family insertion sequence. To build this system, xylose-inducible or constitutive bifidobacterial promoters were tested to drive the expression of full-length or a truncated form at the N terminus of the ISBlo11 transposase. An artificial transposon plasmid, pBFS12, in which ISBlo11 terminal inverted repeats are separated by a 3-bp spacer, was also constructed to mimic the transposition intermediate of IS3 elements. The introduction of this plasmid into a strain expressing transposase resulted in the insertion of the plasmid with an efficiency of >103 CFU/μg DNA. The plasmid targets random 3- to 4-bp sequences, but with a preference for noncoding regions. This mutagenesis system also worked at least in B. longum NCC2705. Characterization of a transposon insertion mutant revealed that a putative α-glucosidase mediates palatinose and trehalose assimilation, demonstrating the suitability of transposon mutagenesis for loss-of-function analysis. We anticipate that this approach will accelerate functional genomic studies of B. longum subsp. longumIMPORTANCE Several hundred species of bacteria colonize the mammalian intestine. However, the genes that enable such bacteria to colonize and thrive in the intestine remain largely unexplored. Transposon mutagenesis, combined with next-generation sequencing, is a promising tool to comprehensively identify these genes but has so far been applied only to a small number of intestinal bacterial species. In this study, a transposon mutagenesis system was established for Bifidobacterium longum subsp. longum, a representative health-promoting Bifidobacterium species. The system enables the identification of genes that promote colonization and survival in the intestine and should help illuminate the physiology of this species.
  • Function and structure of GH13_31 α-glucosidase with high α-(1→4)-glucosidic linkage specificity and transglucosylation activity.
    Auiewiriyanukul W, Saburi W, Kato K, Yao M, Mori H
    FEBS letters, 592, 13, 2268, 2281, 2018年07月, [査読有り], [国際誌]
  • Biochemical and structural characterization of Marinomonas mediterranea D-mannose isomerase Marme_2490 phylogenetically distant from known enzymes
    Wataru Saburi, Nongluck Jaito, Koji Kato, Yuka Tanaka, Min Yao, Haruhide Mori
    Biochimie, 144, 63, 73, Elsevier B.V., 2018年01月01日, [査読有り], [筆頭著者, 責任著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Elucidation of the biosynthetic pathway of cis-jasmone in Lasiodiplodia theobromae
    Ryo Matsui, Naruki Amano, Kosaku Takahashi, Yodai Taguchi, Wataru Saburi, Hideharu Mori, Norio Kondo, Kazuhiko Matsuda, Hideyuki Matsuura
    SCIENTIFIC REPORTS, 7, 1, 6688, 2017年07月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Evaluation of acceptor selectivity of Lactococcus lactis ssp lactis trehalose 6-phosphate phosphorylase in the reverse phosphorolysis and synthesis of a new sugar phosphate
    Yodai Taguchi, Wataru Saburi, Ryozo Imai, Haruhide Mori
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 81, 8, 1512, 1519, 2017年, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Functions, structures, and applications of cellobiose 2-epimerase and glycoside hydrolase family 130 mannoside phosphorylases
    Wataru Saburi
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 80, 7, 1294, 1305, 2016年07月, [査読有り], [筆頭著者, 責任著者], [国際誌]
    英語
  • α-Glucosidases and α-1,4-glucan lyases: structures, functions, and physiological actions.
    Okuyama M, Saburi W, Mori H, Kimura A
    Cellular and molecular life sciences : CMLS, 73, 14, 2727, 2751, 2016年07月, [査読有り], [筆頭著者], [国際誌]
    英語
  • The cold-induced defensin TAD1 confers resistance against snow mold and Fusarium head blight in transgenic wheat
    Kentaro Sasaki, Chikako Kuwabara, Natsuki Umeki, Mari Fujioka, Wataru Saburi, Hirokazu Matsui, Fumitaka Abe, Ryozo Imai
    JOURNAL OF BIOTECHNOLOGY, 228, 3, 7, 2016年06月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Purification and characterization of a chloride ion-dependent α-glucosidase from the midgut gland of Japanese scallop (Patinopecten yessoensis).
    Masuda Y, Okuyama M, Iizuka T, Nakai H, Saburi W, Fukukawa T, Maneesan J, Tagami T, Naraoka T, Mori H, Kimura A
    Bioscience, biotechnology, and biochemistry, 80, 3, 479, 485, 2016年03月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Structural insights into the difference in substrate recognition of two mannoside phosphorylases from two GH130 subfamilies
    Yuxin Ye, Wataru Saburi, Rei Odaka, Koji Kato, Naofumi Sakurai, Keisuke Komoda, Mamoru Nishimoto, Motomitsu Kitaoka, Haruhide Mori, Min Yao
    FEBS LETTERS, 590, 6, 828, 837, 2016年03月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Supplemental epilactose prevents metabolic disorders through uncoupling protein-1 induction in the skeletal muscle of mice fed high-fat diets
    Yuki Murakami, Teruyo Ojima-Kato, Wataru Saburi, Haruhide Mori, Hirokazu Matsui, Soichi Tanabe, Takuya Suzuki
    BRITISH JOURNAL OF NUTRITION, 114, 11, 1774, 1783, 2015年12月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Identification of rice Os4BGlu13 as a β-glucosidase which hydrolyzes gibberellin A4 1-O-β-d-glucosyl ester, in addition to tuberonic acid glucoside and salicylic acid derivative glucosides.
    Hua Y, Ekkhara W, Sansenya S, Srisomsap C, Roytrakul S, Saburi W, Takeda R, Matsuura H, Mori H, Ketudat Cairns JR
    Archives of biochemistry and biophysics, 583, 36, 46, 2015年10月, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌)
  • Functional reassignment of Cellvibrio vulgaris EpiA to cellobiose 2-epimerase and an evaluation of the biochemical functions of the 4-O-β-d-mannosyl-d-glucose phosphorylase-like protein, UnkA.
    Saburi W, Tanaka Y, Muto H, Inoue S, Odaka R, Nishimoto M, Kitaoka M, Mori H
    Bioscience, biotechnology, and biochemistry, 79, 6, 969, 977, 2015年06月, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Structural elements responsible for the glucosidic linkage-selectivity of a glycoside hydrolase family 13 exo-glucosidase
    Wataru Saburi, Hiroaki Rachi-Otsuka, Hironori Hondoh, Masayuki Okuyama, Haruhide Mori, Atsuo Kimura
    FEBS LETTERS, 589, 7, 865, 869, 2015年03月, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Structural insights into the catalytic reaction that is involved in the reorientation of Trp238 at the substrate-binding site in GH13 dextran glucosidase
    Momoko Kobayashi, Wataru Saburi, Daichi Nakatsuka, Hironori Hondoh, Koji Kato, Masayuki Okuyama, Haruhide Mori, Atsuo Kimura, Min Yao
    FEBS LETTERS, 589, 4, 484, 489, 2015年02月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Identity of the two dextran dextrinases produced by Gluconobacter oxydans ATCC 11894 and its localization change depending on the cell growth.
    Sadahiro J, Mori H, Saburi W, Okuyama M, Kimura A
    Biochem Biophys Res Commun, 456, 1, 500, 505, 2015年, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Biochemical properties and substrate recognition mechanism of GH31 α-glucosidase from Bacillus sp. AHU 2001 with broad substrate specificity.
    Saburi W, Okuyama M, Kumagai Y, Kimura A, Mori H
    Biochimie, 108, 108, 140, 148, 2015年, [査読有り], [筆頭著者], [国際誌]
    英語
  • Enhancement of hydrolytic activity of thermophilic alkalophilic alpha-amylase from Bacillus sp AAH-31 through optimization of amino acid residues surrounding the substrate binding site
    Naoya Tamamura, Wataru Saburi, Atsushi Mukai, Naoki Morimoto, Toshihiko Takehana, Seiji Koike, Hirokazu Matsui, Haruhide Mori
    BIOCHEMICAL ENGINEERING JOURNAL, 86, 8, 15, 2014年05月, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Crystallization and preliminary X-ray crystallographic analysis of α-glucosidase HaG from Halomonas sp. strain H11.
    Shen X, Saburi W, Gai ZQ, Komoda K, Yu J, Ojima-Kato T, Kido Y, Matsui H, Mori H, Yao M
    Acta crystallographica. Section F, Structural biology communications, 70, Pt 4, 464, 466, 2014年04月, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌)
  • Structural insights into the epimerization of β-1,4-linked oligosaccharides catalyzed by cellobiose 2-epimerase, the sole enzyme epimerizing non-anomeric hydroxyl groups of unmodified sugars.
    Fujiwara T, Saburi W, Matsui H, Mori H, Yao M
    The Journal of biological chemistry, 289, 6, 3405, 3415, 2014年02月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Characterization of a thermophilic 4-O-β-D-mannosyl-D-glucose phosphorylase from Rhodothermus marinus.
    Jaito N, Saburi W, Odaka R, Kido Y, Hamura K, Nishimoto M, Kitaoka M, Matsui H, Mori H
    Bioscience, biotechnology, and biochemistry, 78, 2, 263, 270, 2014年02月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Replacement of the Catalytic Nucleophile Aspartyl Residue of Dextran Glucosidase by Cysteine Sulfinate Enhances Transglycosylation Activity
    Wataru Saburi, Momoko Kobayashi, Haruhide Mori, Masayuki Okuyama, Atsuo Kimura
    JOURNAL OF BIOLOGICAL CHEMISTRY, 288, 44, 31670, 31677, 2013年11月, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Characterization of Ruminococcus albus cellodextrin phosphorylase and identification of a key phenylalanine residue for acceptor specificity and affinity to the phosphate group.
    Sawano T, Saburi W, Hamura K, Matsui H, Mori H
    The FEBS journal, 280, 18, 4463, 4473, 2013年09月, [査読有り], [筆頭著者], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌)
  • Modulation of Allosteric Regulation by E38K and G101N Mutations in the Potato Tuber ADP-glucose Pyrophosphorylase
    Shinji Wakuta, Yumi Shibata, Yumiko Yoshizaki, Wataru Saburi, Shigeki Hamada, Hiroyuki Ito, Seon-Kap Hwang, Thomas W. Okita, Hirokazu Matsui
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 77, 9, 1854, 1859, 2013年09月, [査読有り], [責任著者], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌)
  • A thermophilic alkalophilic α-amylase from Bacillus sp. AAH-31 shows a novel domain organization among glycoside hydrolase family 13 enzymes.
    Saburi W, Morimoto N, Mukai A, Kim DH, Takehana T, Koike S, Matsui H, Mori H
    Bioscience, biotechnology, and biochemistry, 77, 9, 1867, 1873, 2013年09月, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Identification of rice β-glucosidase with high hydrolytic activity towards salicylic acid β-D-glucoside.
    Himeno N, Saburi W, Wakuta S, Takeda R, Matsuura H, Nabeta K, Sansenya S, Ketudat Cairns JR, Mori H, Imai R, Matsui H
    Bioscience, biotechnology, and biochemistry, 77, 5, 934, 939, 2013年05月, [査読有り], [筆頭著者], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌)
  • Crystal structure of Ruminococcus albus cellobiose 2-epimerase: Structural insights into epimerization of unmodified sugar
    Takaaki Fujiwara, Wataru Saburi, Sota Inoue, Haruhide Mori, Hirokazu Matsui, Isao Tanaka, Min Yao
    FEBS LETTERS, 587, 7, 840, 846, 2013年04月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Identification and Characterization of Cellobiose 2-Epimerases from Various Aerobes
    Teruyo Ojima, Wataru Saburi, Takeshi Yamamoto, Haruhide Mori, Hirokazu Matsui
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 77, 1, 189, 193, 2013年01月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Modulation of acceptor specificity of Ruminococcus albus cellobiose phosphorylase through site-directed mutagenesis
    Ken Hamura, Wataru Saburi, Hirokazu Matsui, Haruhide Mori
    Carbohydrate Research, 379, 21, 25, Elsevier Ltd, 2013年, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • COLD SHOCK DOMAIN PROTEIN 3 is involved in salt and drought stress tolerance in Arabidopsis
    Myung-Hee Kim, Shunya Sato, Kentaro Sasaki, Wataru Saburi, Hirokazu Matsui, Ryozo Imai
    FEBS OPEN BIO, 3, 438, 442, 2013年, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Metabolic Mechanism of Mannan in a Ruminal Bacterium, Ruminococcus albus, Involving Two Mannoside Phosphorylases and Cellobiose 2-Epimerase: DISCOVERY OF A NEW CARBOHYDRATE PHOSPHORYLASE, β-1,4-MANNOOLIGOSACCHARIDE PHOSPHORYLASE.
    Kawahara R, Saburi W, Odaka R, Taguchi H, Ito S, Mori H, Matsui H
    The Journal of biological chemistry, 287, 50, 42389, 42399, 2012年12月, [査読有り], [筆頭著者, 責任著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Bacteroides thetaiotaomicron VPI-5482 glycoside hydrolase family 66 homolog catalyzes dextranolytic and cyclization reactions
    Young-Min Kim, Eiji Yamamoto, Min-Sun Kang, Hiroyuki Nakai, Wataru Saburi, Masayuki Okuyama, Haruhide Mori, Kazumi Funane, Mitsuru Momma, Zui Fujimoto, Mikihiko Kobayashi, Doman Kim, Atsuo Kimura
    FEBS JOURNAL, 279, 17, 3185, 3191, 2012年09月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Immobilization of a Thermostable Cellobiose 2-Epimerase from Rhodothermus marinus JCM9785 and Continuous Production of Epilactose
    Hiroki Sato, Wataru Saburi, Teruyo Ojima, Hidenori Taguchi, Haruhide Mori, Hirokazu Matsui
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 76, 8, 1584, 1587, 2012年08月, [査読有り], [筆頭著者, 責任著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Purification and characterization of a liquefying α-amylase from alkalophilic thermophilic Bacillus sp. AAH-31.
    Kim DH, Morimoto N, Saburi W, Mukai A, Imoto K, Takehana T, Koike S, Mori H, Matsui H
    Bioscience, biotechnology, and biochemistry, 76, 7, 1378, 1383, 2012年07月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Novel Dextranase Catalyzing Cycloisomaltooligosaccharide Formation and Identification of Catalytic Amino Acids and Their Functions Using Chemical Rescue Approach
    Young-Min Kim, Yoshiaki Kiso, Tomoe Muraki, Min-Sun Kang, Hiroyuki Nakai, Wataru Saburi, Weeranuch Lang, Hee-Kwon Kang, Masayuki Okuyama, Haruhide Mori, Ryuichiro Suzuki, Kazumi Funane, Nobuhiro Suzuki, Mitsuru Momma, Zui Fujimoto, Tetsuya Oguma, Mikihiko Kobayashi, Doman Kim, Atsuo Kimura
    JOURNAL OF BIOLOGICAL CHEMISTRY, 287, 24, 19927, 19935, 2012年06月, [査読有り], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌)
  • α-Glucosylated 6-gingerol: chemoenzymatic synthesis using α-glucosidase from Halomonas sp. H11, and its physical properties.
    Ojima T, Aizawa K, Saburi W, Yamamoto T
    Carbohydrate research, 354, 59, 64, 2012年06月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • A novel metabolic pathway for glucose production mediated by α-glucosidase-catalyzed conversion of 1,5-anhydrofructose.
    Kim YM, Saburi W, Yu S, Nakai H, Maneesan J, Kang MS, Chiba S, Kim D, Okuyama M, Mori H, Kimura A
    The Journal of biological chemistry, 287, 27, 22441, 22444, 2012年06月, [査読有り], [筆頭著者], [国際共著], [国際誌]
    英語, 研究論文(学術雑誌)
  • Enzymatic Characteristics of Cellobiose Phosphorylase from Ruminococcus albus NE1 and Kinetic Mechanism of Unusual Substrate Inhibition in Reverse Phosphorolysis
    Ken Hamura, Wataru Saburi, Shotaro Abe, Naoki Morimoto, Hidenori Taguchi, Haruhide Mori, Hirokazu Matsui
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 76, 4, 812, 818, 2012年04月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Characterization of Halomonas sp. strain H11 α-glucosidase activated by monovalent cations and its application for efficient synthesis of α-D-glucosylglycerol.
    Ojima T, Saburi W, Yamamoto T, Kudo T
    Applied and environmental microbiology, 78, 6, 1836, 1845, 2012年03月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Biochemical Characterization of a Thermophilic Cellobiose 2-Epimerase from a Thermohalophilic Bacterium, Rhodothermus marinus JCM9785
    Teruyo Ojima, Wataru Saburi, Hiroki Sato, Takeshi Yamamoto, Haruhide Mori, Hirokazu Matsui
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 75, 11, 2162, 2168, 2011年11月, [査読有り]
    英語, 研究論文(学術雑誌)
  • OsJAR1 and OsJAR2 are jasmonyl-L-isoleucine synthases involved in wound- and pathogen-induced jasmonic acid signalling
    Shinji Wakuta, Erika Suzuki, Wataru Saburi, Hideyuki Matsuura, Kensuke Nabeta, Ryozo Imai, Hirokazu Matsui
    BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 409, 4, 634, 639, 2011年06月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • 難消化性二糖エピラクトースによるカルシウム吸収・鉄吸収、骨形成、貧血の回復作用に関する研究 ―胃切除ラットにおけるフラクトオリゴ糖との比較検討―
    田口 秀典, 鈴木 卓弥, 西向 めぐみ, 横嶋 悟, 小島 晃代, 山本 健, 佐分利 亘, 原 博, 金田 勇, 小野寺 秀一, 塩見 徳夫, 松井 博和
    Journal of Applied Glycoscience Supplement, 2011, 0, 74, 74, The Japanese Society of Applied Glycoscience, 2011年, [査読有り], [国内誌]
    研究論文(学術雑誌)
  • Ingestion of Epilactose, a Non-digestible Disaccharide, Improves Postgastrectomy Osteopenia and Anemia in Rats through the Promotion of Intestinal Calcium and Iron Absorption
    Takuya Suzuki, Megumi Nishimukai, Aki Shinoki, Hidenori Taguchi, Satoru Fukiya, Atsushi Yokota, Wataru Saburi, Takeshi Yamamoto, Hiroshi Hara, Hirokazu Matsui
    JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 58, 19, 10787, 10792, 2010年10月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • 難消化性二糖エピラクトースによるカルシウム吸収・鉄吸収、骨形成、貧血の回復作用に関する研究 ~胃切除ラットでの評価
    鈴木 卓弥, 西向 めぐみ, 田口 秀典, 濱田 茂樹, 佐分利 亘, 山本 健, 伊藤 進, 原 博, 松井 博和
    Journal of Applied Glycoscience Supplement, 2010, 90, 90, 日本応用糖質科学会, 2010年
    日本語
  • Streptococcus mutans由来 dextran glucosidaseの部位特異的変異導入による糖転移活性の改変 (2)
    中塚 大地, 本同 宏成, 大塚 博昭, 佐分利 亘, 森 春英, 奥山 正幸, 木村 淳夫
    Journal of Applied Glycoscience Supplement, 2009, 34, 34, 日本応用糖質科学会, 2009年
    日本語
  • Structure-function relationship of substrate length specificity of dextran glucosidase from Streptococcus mutans
    Wataru Saburi, Hironori Hondoh, Young-Min Kim, Haruhide Mori, Masayuki Okuyama, Atsuo Kimura
    BIOLOGIA, 63, 6, 1000, 1005, 2008年12月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Gene cloning and enzymatic characteristics of a novel gamma-cyclodextrin-specific cyclodextrinase from alkalophilic Bacillus clarkii 7364.
    Nakagawa Y, Saburi W, Takada M, Hatada Y, Horikoshi K
    Biochimica et biophysica acta, 1784, 12, 2004, 2011, 2008年12月, [査読有り], [国際誌]
  • Molecular Mechanism of α-glucosidase
    Masayuki Okuyama, Haruhide Mori, Hironori Hondoh, Hiroyuki Nakai, Wataru Saburi, Min Sung Kang, Young Min Kim, Mamoru Nishimoto, Jintanart Wongchawalit, Takeshi Yamamoto, Mee Son, Jin Ha Lee, San San Mar, Kenji Fukuda, Seiya Chiba, Atsuo Kimura
    Carbohydrate-Active Enzymes: Structure, Function and Applications, 64, 76, 2008年09月, [査読有り], [国際誌]
    論文集(書籍)内論文
  • Substrate recognition mechanism of alpha-1,6-glucosidic linkage hydrolyzing enzyme, dextran glucosidase from Streptococcus mutans
    Hironori Hondoh, Wataru Saburi, Haruhide Mori, Masayuki Okuyama, Toshitaka Nakada, Yoshiki Matsuura, Atsuo Kimura
    JOURNAL OF MOLECULAR BIOLOGY, 378, 4, 913, 922, 2008年05月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Crystallization and preliminary X-ray analysis of Streptococcus mutans dextran glucosidase
    Wataru Saburi, Hironori Hondoh, Hideaki Unno, Masayuki Okuyama, Haruhide Mori, Toshitaka Nakada, Yoshiki Matsuura, Atsuo Kimura
    ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY AND CRYSTALLIZATION COMMUNICATIONS, 63, Pt 9, 774, 776, 2007年09月, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Structural elements in dextran glucosidase responsible for high specificity to long chain substrate.
    Saburi W, Mori H, Saito S, Okuyama M, Kimura A
    Biochimica et biophysica acta, 1764, 4, 688, 698, 2006年04月, [査読有り], [筆頭著者], [国際誌]
    英語, 研究論文(学術雑誌)
  • Enzymatic synthesis of alkyl α-2-deoxylglucosides by alkyl alcohol resistant α-glucosidase from Aspergillus niger
    Kim YM, Okuyama M, Mori H, Nakai H, Saburi W, Chiba S, Kimura A
    Tetrahedron Asymmetry, 16, 2, 403, 409, 2005年01月24日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)
  • Molecular analysis of α-glucosidase belonging to GH-family 31
    Nakai H, Okuyama M, Kim YM, Saburi W, Wongchawalit J, Mori H, Chiba S, Kimura A
    Biologia, Bratislava, 60, 131, 135, 2005年, [査読有り], [国際誌]
    英語
  • Isolation and characterization of cDNA encoding P-19.5 protein accumulated preferentially at early stage of carrot somatic embryogenesis
    Takuma Sano, Mamoru Nishimoto, Wataru Saburi, Atsuo Kimura, Hiroshi Yasuda, Masahiro Uchibatake, Takuji Ohwada, Hiroshi Masuda
    Plant Science, 167, 6, 1211, 1217, 2004年12月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌)

その他活動・業績

所属学協会

  • 日本応用糖質科学会               
  • 日本農芸化学会               

共同研究・競争的資金等の研究課題

  • 新規オキシリピン生合成経路の解明を目指したゼニゴケの鍵酵素の同定と応用展開
    科学研究費助成事業
    2023年04月01日 - 2026年03月31日
    北岡 直樹, 佐分利 亘
    植物オキシリピンの中には植物ホルモンの一種であるジャスモン酸 (JA)類が含まれる。ジャスモン酸類の受容体であるCOI1-JAZのリガンドは、高等植物においてはジャスモン酸イソロイシンである一方、ゼニゴケではジャスモン酸の生合成中間体でもあるdinor-cis-12-ファイトジエン酸 (dn-OPDA)であるということが明らかとなっている。本研究では、ゼニゴケを研究対象とし、苔類における植物オキシリピンの生合成経路と生理作用解明を目指し研究を進めている。
    ゼニゴケにおける生合成経路の解析に必要となる重水素標識体を含むゼニゴケのオキシリピン類の標準物質の有機合成を行った。合成したdn-OPDAの重水素標識体を取り込ませたゼニゴケにおいてジャスモン酸の生成を確認した。また、JAの生合成中間体と考えられる化合物をゼニゴケ植物体より検出した。以上結果は、dn-OPDAからJAへの代謝経路をゼニゴケが有していることを示唆する結果である。またOPDAより生合成経路上、下流に位置すると予想される酵素遺伝子の破壊株の作製を行った。
    また、ジャスモン酸メチル (MeJA)の重水素標識体を気中より取り込ませたゼニゴケにおいて、JAの生合成が誘導されるという結果を見出した。本研究結果は、ゼニゴケがJAもしくはその代謝物を認識していることを示唆する結果である。
    OPDAを基質とする代謝酵素の探索も進めている。ゼニゴケ粗酵素溶液より酵素活性を指標に酵素精製を進めた。部分精製後の酵素溶液をプロテオーム解析に供し、ゼニゴケのOPDA代謝に関わる候補酵素の選抜に成功した。
    日本学術振興会, 基盤研究(C), 北海道大学, 23K05047
  • ゲノムデザインと自由な書き換えによる高収量コムギの創出
    科学研究費助成事業
    2021年07月09日 - 2024年03月31日
    今井 亮三, 佐分利 亘
    日本学術振興会, 挑戦的研究(萌芽), 国立研究開発法人農業・食品産業技術総合研究機構, 21K19127
  • 糖質の効率的変換に有用な糖質異性化酵素の構造基盤の解明と機能強化
    科学研究費助成事業 基盤研究(C)
    2021年04月01日 - 2024年03月31日
    佐分利 亘
    糖質の高度利用には,希少糖質の効率合成法が必要である.本研究では,微生物の多様な糖質代謝を支える異性化酵素の中でも,セロビオース2-エピメラーゼやマンノースイソメラーゼなど様々な糖質異性化酵素を含む酵素群に注目し,反応特異性を制御する機構の解明と高活性変異酵素の開発を目的とした.セロビオース2-エピメラーぜの中にはエピメラーゼ活性のみを示す酵素 (1機能CE) とエピメラーゼ活性に加えてイソメラーゼ活性を示す酵素 (2機能CE) が存在するが,この特異性の違いを説明する構造は明らかではなかった.そこで,1機能CEと2機能CEの間で構造領域を入れ換えた一連のキメラ酵素を作成した.具体的には,(α/α)6バレルの触媒ドメインを構成するαヘリックス1と2,3と4,5と6,7と8,9と10,11と12について,1機能酵素の構造を2機能酵素に移植した.これら6つのキメラ酵素のうち,最初の3つの変異酵素は活性型酵素として得られた.この機能について解析を進めている.
    マンノースエピメラーゼ (ME酵素) については高活性変異酵素の取得のため,ハイスループットスクリーニング系を検討した.本スクリーニング系では,マンノーストランスポーター遺伝子を欠失させることでマンノース資化性を失われた大腸菌を用い,この細胞表層にME酵素を発現させることでマンノース資化性の回復,また,活性に応じた生育速度の増加により高活性変異酵素をスクリーニングすることを計画した.マンノーストランスポーターを構成する3タンパク質全ての遺伝子を欠失させることでマンノース資化性を完全に失わせることができた.この大腸菌変異株をホストとし,氷核タンパク質のNドメインを付加したME酵素を発現させると,ME酵素は外膜画分に生産され,マンノース資化性の回復が確認された.この系を利用して高活性変異酵素をスクリーニングする予定である.
    日本学術振興会, 基盤研究(C), 北海道大学, 21K05388
  • D-マンノ-ス骨格を持つ糖鎖による免疫・炎症反応制御とその分子基盤の解析
    科学研究費助成事業 基盤研究(B)
    2019年04月01日 - 2022年03月31日
    戸田 雅子, 佐分利 亘, 比能 洋, 新谷 尚弘
    真菌類や植物には結合様式の異なる様々なα型とβ型のマンナン(D-マンノ-スを含む多糖類)が含まれる。マンナンは「免疫系に対する機能を持つ食品成分」と注目され、その機能性の科学的解析が求められている。本研究はマンノ-ス骨格を持つ分子の免疫学的な意義を明らかすることを目的とする。また、日本の国菌と言われる「麹菌」を用いてマンノシル化アレルゲンを発現する麹菌を構築し、抗アレルギ-作用を持つマンナン分子の作製を目指す。本年度はまずβ型マンノオリゴ糖の調製を行い、その免疫機能性を解析した。その結果、β-Man-(1→4)-Manやβ-Man-(1→4)-Glc骨格を持つオリゴ糖の中で、β-1,4-マンノビオースがマウス骨髄樹状細胞を高レベルで活性化することが明らかになった。また、α型マンナンをβ-1,4-マンノビオースや他の多糖類と共に樹状細胞を刺激すると、樹状細胞による抗炎症サイトカイン産生が増強されることを見いだした。αマンノオリゴ糖に関しては、α-1,2およびα-1,6結合への伸長方向が任意に制御可能な保護基の組み合わせによるαマンノオリゴ糖の合成ルート構築を実施した。この目的を満たす共通中間体の最適化を行い、中間体を使用することによりそれぞれのα-1,2およびα-1,6結合型の直鎖オリゴ糖をベンジルグリコシド体として調製するルート構築に成功した。マンノシル化アレルゲンを発現する麹菌に関しては、オボアルブミン(OVA:モデルアレルゲン)の cDNAを麹菌グルコアミラーゼglaAの触媒ドメインをコードするDNAの下流に連結し、GlaA-OVA融合タンパク質として麹菌で発現させた。2日間液体培養した培養上清500 µL分をSDS-PAGEに供し、Coomassie Brilliant Blue R-250染色したところ、OVAの発現が確認できたが発現量は低かった。
    日本学術振興会, 基盤研究(B), 東北大学, 19H02902
  • 糖質の多様化高機能化に向けた酵素法アプローチの新展開
    科学研究費助成事業 基盤研究(B)
    2018年04月01日 - 2021年03月31日
    森 春英, 佐分利 亘
    糖質は構成糖と結合様式により顕著な多様性を示す.食品機能性素材やバイオ素材等,素材の潜在的宝箱であり,機能発見と応用利用に向けて,多様性に対応可能な効率的合成手法の確立が必須である.本申請研究は,合成酵素と転移酵素利用を利用した糖質多様化に向けた合成手法の確立を目的としている.
    合成酵素利用による糖質合成に関しては,ショ糖からの糖ヌクレオチド合成酵素の高機能化に向けた変異酵素等の解析,および安定的な利用条件について検討を行った.糖供与体基質としてショ糖に依存しない糖ヌクレオチド合成酵素について,利用条件の検討を進めた.本酵素単独での反応による新規オリゴ糖数種の合成も行い,構造決定により新規化合物であることを確認した.反応条件検討により収率向上を図った.
    糖転移酵素関連では,TS酵素(N末端側を伸長型酵素)は伸長部分を含めて主要3ドメインにより構成され,各ドメイン単独のタンパク質,ならびに各ドメイン欠失タンパク質を調製・機能解析を行い,各ドメインが有する機能を実験的に明らかにした.マルトオリゴ糖からイソマルトオリゴ糖形成に至る逐次的反応を明らかにした.
    糖質の合成に関して,植物において代謝制御物質として機能するトレハロース6-リン酸を,酵素により合成する反応系を確立した.本反応では,マルトオリゴ糖を唯一の炭素源として,3酵素を含むワンポット反応により目的の糖リン酸を合成するものであり,簡便かつ有効な合成系である.
    日本学術振興会, 基盤研究(B), 北海道大学, 18H02133
  • 微生物が持つ新しい糖質異性化酵素群を活用した糖質変換技術の開発と応用
    科学研究費助成事業 基盤研究(C)
    2018年04月01日 - 2021年03月31日
    佐分利 亘
    多様な構造を持つ糖質には様々な優良な機能が知られている。自然界に豊富に存在する糖質は極めて限定的で,豊富な糖質を希少糖質へと変換する技術を開発することで、新しい糖質の応用が拓けると考えられる.本研究では,単糖変換を触媒する異性化酵素であり,グルコースからマンノースへの一段階異性化反応を触媒するマンノース2-エピメラーゼ (ME) について機能・構造を解明すること,ホモログの機能解析を通じて新たな単糖変換酵素を取得することを目的とした。本年度は,MEに特徴的な長いループ構造に注目して3つの細菌に由来するMEホモログの機能を大腸菌組換え酵素を用いて解析し,いずれのホモログにもME活性を認めた。このことから,MEに特徴的な長いループ構造に着目することで精度良くMEを取得できることが示された.また,興味深いことに,これらの基質を検討する中で,ME酵素がキシロースやリキソースなどの単糖にも作用し,エピメラーゼ活性のみならずイソメラーゼ活性も微弱ながら示すことが明らかになった.Runella slithformis由来MEの高活性化変異酵素の取得に先立ち、変異酵素のハイスループットスクリーニング系を検討した。すなわち,96穴プレートを活用した小規模培養系による組換え酵素生産条件,溶菌試薬による酵素抽出条件と無細胞抽出液の酵素活性の評価方法を確立した。単糖にも有意に高いエピメリ化活性を持つMelioribacter roseus由来セロビオース2-エピメラーゼ (CE) について,本酵素に見られたMEに対応する長いループに注目し,この削除変異酵素を調製して基質特異性を検討した.当該変異酵素は野生型酵素より明らかに低い単糖に対する特異性を示した.ループの短縮化に伴う単糖特異性の低下から,本ループ構造がM. roseus由来CEの単糖への高い活性に重要なことが明らかになった。
    日本学術振興会, 基盤研究(C), 北海道大学, 18K05382
  • 植物の病害抵抗性を支配するシグナル物資の活性化の分子基盤
    科学研究費助成事業 基盤研究(C)
    2015年10月21日 - 2018年03月31日
    松井 博和, 佐分利 亘
    植物ではシグナル物質の多くは配糖化により不活性化され,加水分解により活性化される.本研究ではツベロン酸(TA)配糖体 を加水分解するイネβ-グルコシダーゼTAGG2がサリチル酸グルコシド (SAG) にも高い活性を持つことに注目し,SAG分解に重要なアミノ酸残基を特定し,アポプラストへの局在を明らかにした.TAGG2過剰発現イネではTA量の増加は見られたが,SA量の明確な増加は見られなかった.いもち菌接種試験では,TAGG過剰発現体において野生型よりも病斑形成が促進されることが明らかになった.シロイヌナズナホモログはSAGよりもラミナリオリゴ糖などオリゴ糖基質によく作用した.
    日本学術振興会, 基盤研究(C), 北海道大学, 15K07379
  • オリゴ糖・多糖・配糖体の酵素合成の分子基盤的研究
    科学研究費助成事業 基盤研究(B)
    2015年04月01日 - 2018年03月31日
    森 春英, 佐分利 亘
    糖質は,構成単糖と結合様式と重合度によって顕著な多様性を持つ分子群である.有用化合物が多数存在すると予想されるが,機能性の解析には潤沢な化合物が必要であり,効率的な大量合成系確立が必須である.本研究では,天然に豊富に存在する糖質からの転換として,合成酵素と転移酵素を利用した高度な糖質合成系確立を実施した.合成酵素利用では,ショ糖を出発物質として合成酵素の基質(UDP-Glcなどの糖ヌクレオチド)を供給するワンポット反応により二糖の合成系を確立した.新規転移酵素はマルトオリゴ糖に作用し,グルコース単位での転移反応を触媒する酵素群を見いだした.
    日本学術振興会, 基盤研究(B), 北海道大学, 15H04484
  • オリゴ糖異性化酵素とその類縁酵素の構造基盤の解明
    科学研究費助成事業 若手研究(B)
    2014年04月01日 - 2016年03月31日
    佐分利 亘
    セロビオース2-エピメラーゼ (CE) は,β1-4二糖の還元末端グルコース残基をマンノース残基に異性化する。本酵素は触媒ドメインおよび触媒部位構造を他の単糖異性化酵素と共有する。本研究では,これら酵素の構造機能相関を解析した。Rhodothermus marinus由来CEの基質結合部位残基への変異により二糖特異性に重要なアミノ酸残基を決定した。また,本酵素に僅かなイソメラーゼ活性を認め,Cardicellulosiruptor saccharolyticus由来酵素との比較からイソメラーゼ活性に重要な構造を見出した。機能未知タンパク質の解析から、新規なマンノース異性化酵素を見出した。
    日本学術振興会, 若手研究(B), 北海道大学, 26850059
  • オリゴ糖異性化酵素とその類縁酵素の構造基盤の解明               
    科学研究費補助金 若手研究(B)
    2014年04月 - 2016年03月
    佐分利 亘
    文部科学省, 研究代表者, 競争的資金
  • 植物ホルモンの新規な代謝酵素の同定と機能解析
    科学研究費助成事業 基盤研究(C)
    2012年04月01日 - 2015年03月31日
    松井 博和, 佐分 利亘, 松浦 英幸
    ジャスモン酸 (JA) は病傷害ストレス応答,生長などに関与する植物ホルモンである.本研究ではJAシグナルの不活性化に働くと推定したCYP94D1,CYP94D2およびILL6の機能解析を行った.CYP94D1については遺伝子発現量の調整により表現型の変化が認められた.すなわち,遺伝子欠損株ではJAへの感受性の低下,過剰発現体ではJAの水酸化物の誘導体ツベロン酸グルコシドの蓄積が見られた.
    日本学術振興会, 基盤研究(C), 北海道大学, 24580134
  • オリゴ糖異性化酵素ならびに類縁酵素群の機能解明と有用糖質の効率合成への応用展開               
    奨励研究助成
    2014年04月 - 2015年03月
    佐分利 亘
    野田産業科学研究所, 研究代表者, 競争的資金
  • 2つの新規な糖質ホスホリラーゼの分子解析
    科学研究費助成事業 若手研究(B)
    2012年04月01日 - 2014年03月31日
    佐分利 亘
    反芻動物の第一胃ルーメンに共生する偏性嫌気性細菌Ruminococcus albusは二つのマンノシルグルコースホスホリラーゼ (I型酵素とII型酵素) を持つ。基質特異性を検討したところ,I型酵素はマンノシルグルコースに特異的な酵素であり,II型酵素はマンノオリゴ糖に高い活性を示す酵素であることが判明した.合成反応では,I型酵素のみ6-OHグルコース誘導体をアクセプタ基質とした.アミノ酸配列の比較から推定したアミノ酸残基の変異酵素の解析から,I型酵素のAsp129が触媒残基と考えられた.また,I型酵素のIle212がグルコース6位誘導体への合成活性に重要な残基であることが明らかになった.
    日本学術振興会, 若手研究(B), 北海道大学, 24780091
  • プレバイオティクスとして機能するエピラクトースの実用的合成法の開発               
    A-STEP 研究成果最適展開支援プログラム 第1回【FS】 探索タイプ
    2013年08月 - 2014年03月
    佐分利 亘
    科学技術振興機構, 研究代表者, 競争的資金
  • 2つの新規な糖質ホスホリラーゼの分子解析               
    科学研究費補助金 若手研究(B)
    2012年04月 - 2014年03月
    佐分利 亘
    文部科学省, 研究代表者, 競争的資金
  • プレバイオティクスの革新的酵素合成技術の開発               
    研究開発助成事業」(フードイノベーション創造支援事業 研究シーズ発掘補助金)
    2012年08月 - 2013年03月
    佐分利 亘
    ノーステック財団, 研究代表者, 競争的資金
  • バイオリアクターを利用したエピラクトースの効率的合成法の開発               
    「研究開発助成事業」(若手研究人材育成事業 Talent補助金)
    2011年09月 - 2012年03月
    佐分利 亘
    ノーステック財団, 研究代表者, 競争的資金
  • ルーメン細菌によるヘミセルロース分解の分子機構の解析               
    研究助成 (奨励助成)
    2011年04月 - 2012年03月
    佐分利 亘
    公益財団法人秋山記念生命科学振興財団, 研究代表者, 競争的資金

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