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Takada H, Katoh T, Sakanaka M, Odamaki T, Katayama T. GH20 and GH84 β-N-acetylglucosaminidases with different linkage specificities underpin mucin O-glycan breakdown capability of Bifidobacterium bifidum. J Biol Chem 2023:104781. [PMID: 37146969 DOI: 10.1016/j.jbc.2023.104781] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 04/28/2023] [Accepted: 04/29/2023] [Indexed: 05/07/2023] Open
Abstract
Intestinal mucus layers mediate symbiosis and dysbiosis of host-microbe interactions. These interactions are influenced by the mucin O-glycan degrading ability of several gut microbes. The identities and prevalence of many glycoside hydrolyses (GHs) involved in microbial mucin O-glycan breakdown have been previously reported; however, the exact mechanisms and extent to which these GHs are dedicated to mucin O-glycan degradation pathways warrant further research. Here, using Bifidobacterium bifidum as a model mucinolytic bacterium, we revealed that two β-N-acetylglucosaminidases belonging to the GH20 (BbhI) and GH84 (BbhIV) families play important roles in mucin O-glycan degradation. Using substrate specificity analysis of natural oligosaccharides and O-glycomic analysis of porcine gastric mucin (PGM) incubated with purified enzymes or B. bifidum carrying bbhI and/or bbhIV mutations, we showed that BbhI and BbhIV are highly specific for β-(1→3)- and β-(1→6)-GlcNAc linkages of mucin core structures, respectively. Interestingly, we found that efficient hydrolysis of the β-(1→3)-linkage by BbhI of the mucin core 4 structure [GlcNAcβ1-3(GlcNAcβ1-6)GalNAcα-O-Thr] required prior removal of the β-(1→6)-GlcNAc linkage by BbhIV. Consistent with this, inactivation of bbhIV markedly decreased the ability of B. bifidum to release GlcNAc from PGM. When combined with a bbhI mutation, we observed that the growth of the strain on PGM was reduced. Finally, phylogenetic analysis suggests that GH84 members may have gained diversified functions through microbe-microbe and host-microbe horizontal gene transfer events. Taken together, these data strongly suggest GH84 family members in host glycan breakdown.
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Affiliation(s)
- Hiromi Takada
- Graduate School of Biostudies, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Toshihiko Katoh
- Graduate School of Biostudies, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Mikiyasu Sakanaka
- Graduate School of Biostudies, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan
| | - Toshitaka Odamaki
- Graduate School of Biostudies, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan; Next Generation Science Institute, Morinaga Milk Industry Co. Ltd., Zama, Kanagawa 252-8583, Japan
| | - Takane Katayama
- Graduate School of Biostudies, Kyoto University, Sakyo-Ku, Kyoto 606-8502, Japan.
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Chiku K, Yoshida M, Ono H, Kitaoka M. Generation of 3-deoxypentulose by the isomerization and β-elimination of 4-O-substituted glucose and fructose. Carbohydr Res 2021; 508:108402. [PMID: 34303026 DOI: 10.1016/j.carres.2021.108402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/15/2021] [Accepted: 07/16/2021] [Indexed: 11/18/2022]
Abstract
Aldose-ketose isomerization is commonly used to prepare rare oligosaccharides such as maltulose (4-O-α-d-glucopyranosyl-d-fructose) and lactulose (4-O-β-d-galactopyranosyl-d-fructose). However, both sugars are degraded under alkaline conditions via β-elimination, while their subsequent benzylic acid rearrangement leads to the formation of isosaccharinic acids. Here, we investigated the behavior of maltose and maltulose upon heating in phosphate buffer solution at pH 7.5. Maltose was initially isomerized into maltulose. Maltulose was degraded via β-elimination, followed by keto-enol tautomerization, which led to the formation of a 1,3-dicarbonyl intermediate bearing an aldehyde group at the C-1 position and a ketone group at the C-3 position. Subsequent hydrolysis of this intermediate afforded formic acid and 3-deoxy-d-glycero-pent-2-ulose (1) as the major products based on HPLC and NMR data. In contrast, the formation of isosaccharinic acid via benzylic acid rearrangement, not the 3-deoxypentulose, was reported under the strongly alkaline conditions (Knill and Kennedy, 2003). The heat treatment of 1→4 linked oligo- and polysaccharides possessing glucose or fructose residue at the reducing end under neutral pH conditions could be applied for the practical preparation of a 3-deoxypentulose.
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Affiliation(s)
- Kazuhiro Chiku
- Faculty of Applied Life Science, Nippon Veterinary and Life Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan.
| | - Mitsuru Yoshida
- Faculty of Applied Life Science, Nippon Veterinary and Life Science University, 1-7-1 Kyonancho, Musashino-shi, Tokyo, 180-8602, Japan
| | - Hiroshi Ono
- Advanced Analysis Center, National Agriculture and Food Research Organization, 2-1-12 Kannondai, Tsukuba, Ibaraki, 305-8642, Japan
| | - Motomitsu Kitaoka
- Faculty of Agriculture, Niigata University, Niigata, 950-2181, Japan
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3
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Alkoxycarbonyl elimination of 3-O-substituted glucose and fructose by heat treatment under neutral pH. Carbohydr Res 2020; 496:108129. [PMID: 32858482 DOI: 10.1016/j.carres.2020.108129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 08/06/2020] [Accepted: 08/07/2020] [Indexed: 11/23/2022]
Abstract
3-O-Substituted reducing aldoses are commonly unstable under heat treatment at neutral and alkaline pH. In this study, to evaluate the decomposition products, nigerose (3-O-α-d-glucopyranosyl-d-glucose) and 3-O-methyl glucose were heated at 90 °C in 100 mM sodium phosphate buffer (pH 7.5). Decomposition via β-elimination was observed that formed a mixture of 3-deoxy-arabino-hexonic acid and 3-deoxy-ribo-hexonic acid; upon further acid treatment, it was converted to their γ-lactones. Similarly, turanose (3-O-α-d-glucopyranosyl-d-fructose), a ketose isomer of nigerose, decomposed more rapidly than nigerose under the same conditions, forming the same products. These findings indicate that 3-O-substituted reducing glucose and fructose decompose via the same 1,2-enediol intermediate. The alkoxycarbonyl elimination of 3-O-substituted reducing glucose and fructose occurs readily if an O-glycosidic bond is located on the carbon adjacent to the 1,2-enediol intermediate. Following these experiments, we proposed a kinetic model for the3- decomposition of nigerose and turanose by heat treatment under neutral pH conditions. The proposed model showed a good fit with the experimental data collected in this study. The rate constant of the decomposition for nigerose was (1.2 ± 0.1) × 10-4 s-1, whereas that for turanose [(2.6 ± 0.2) × 10-4 s-1] was about 2.2 times higher.
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4
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Takada H, Katoh T, Katayama T. Sialylated O -Glycans from Hen Egg White Ovomucin are Decomposed by Mucin-degrading Gut Microbes. J Appl Glycosci (1999) 2020; 67:31-39. [PMID: 34354526 PMCID: PMC8279891 DOI: 10.5458/jag.jag.jag-2019_0020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 02/07/2020] [Indexed: 01/05/2023] Open
Abstract
Ovomucin, a hen egg white protein, is characterized by its hydrogel-forming properties, high molecular weight, and extensive O -glycosylation with a high degree of sialylation. As a commonly used food ingredient, we explored whether ovomucin has an effect on the gut microbiota. O- Glycan analysis revealed that ovomucin contained core-1 and 2 structures with heavy modification by N -acetylneuraminic acid and/or sulfate groups. Of the two mucin-degrading gut microbes we tested, Akkermansia muciniphila grew in medium containing ovomucin as a sole carbon source during a 24 h culture period, whereas Bifidobacterium bifidum did not. Both gut microbes, however, degraded ovomucin O -glycans and released monosaccharides into the culture supernatants in a species-dependent manner, as revealed by semi-quantified mass spectrometric analysis and anion exchange chromatography analysis. Our data suggest that ovomucin potentially affects the gut microbiota through O -glycan decomposition by gut microbes and degradant sugar sharing within the community.
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Nishimoto M. Large scale production of lacto- N-biose I, a building block of type I human milk oligosaccharides, using sugar phosphorylases. Biosci Biotechnol Biochem 2019; 84:17-24. [PMID: 31566084 DOI: 10.1080/09168451.2019.1670047] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Human milk oligosaccharides (HMOs) have drawn attention for their contribution to the explosive bifidobacterial growth in the intestines of neonates. We found that bifidobacteria can efficiently metabolize lacto-N-biose I (LNB), the major building blocks of HMOs, and we have developed a method to synthesize LNB by applying this system. We produced LNB on a kilogram scale by the method. This proved that, among the enterobacteria, only bifidobacteria can assimilate LNB, and provided the data that supported the explosive growth of bifidobacteria in neonates. Furthermore, we were also able to reveal the structure of LNB crystal and the low stability for heating at neutral pH, which has not been clarified so far. In this paper, using bifidobacteria and LNB as examples, I describe the research on oligosaccharide synthesis that was conducted by utilizing a sugar metabolism.Abbreviations: LNB: lacto-N-biose I; GNB: galacto-N-biose; HMOs: human milk oligosaccharides; GLNBP: GNB/LNB phosphorylase; NahK: N-acetylhexosamine 1-kinase; GalT: UDP-glucose-hexose-1-phosphate uridylyltransferase; GalE: UDP-glucose 4-epimerase; SP: sucrose phosphorylase.
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Affiliation(s)
- Mamoru Nishimoto
- Food Research Institute, National Agriculture and Food Research Organization, Tsukuba, Japan
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6
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Osada M, Kobayashi H, Miyazawa T, Suenaga S, Ogata M. Non-catalytic conversion of chitin into Chromogen I in high-temperature water. Int J Biol Macromol 2019; 136:994-999. [PMID: 31229547 DOI: 10.1016/j.ijbiomac.2019.06.123] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 05/27/2019] [Accepted: 06/17/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Mitsumasa Osada
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1, Tokida, Ueda, Nagano 386-8567, Japan.
| | - Hisaya Kobayashi
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1, Tokida, Ueda, Nagano 386-8567, Japan
| | - Tatsuya Miyazawa
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1, Tokida, Ueda, Nagano 386-8567, Japan
| | - Shin Suenaga
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1, Tokida, Ueda, Nagano 386-8567, Japan
| | - Makoto Ogata
- Department of Applied Chemistry and Biochemistry, National Institute of Technology, Fukushima College, Nagao 30, Iwaki, Fukushima, 970-8034, Japan
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7
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Chiku K, Wada M, Atsuji H, Hosonuma A, Yoshida M, Ono H, Kitaoka M. Epimerization and Decomposition of Kojibiose and Sophorose by Heat Treatment under Neutral pH Conditions. J Appl Glycosci (1999) 2019; 66:1-9. [PMID: 34354514 PMCID: PMC8056910 DOI: 10.5458/jag.jag.jag-2018_0002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 10/12/2018] [Indexed: 11/24/2022] Open
Abstract
We evaluated the stabilities of kojibiose and sophorose when heated under neutral pH conditions. Kojibiose and sophorose epimerized at the C-2 position of glucose on the reducing end, resulting in the production of 2-O-α-D-glucopyranosyl-D-mannose and 2-O-β-D-glucopyranosyl-D-mannose, respectively. Under weak alkaline conditions, kojibiose was decomposed due to heating into its mono-dehydrated derivatives, including 3-deoxy-2,3-unsaturated compounds and bicyclic 3,6-anhydro compounds. Following these experiments, we propose a kinetic model for the epimerization and decomposition of kojibiose and sophorose by heat treatment under neutral pH and alkaline conditions. The proposed model shows a good fit with the experimental data collected in this study. The rate constants of a reversible epimerization of kojibiose at pH 7.5 and 90 °C were (1.6 ± 0.1) × 10-5 s-1 and (3.2 ± 0.2) × 10-5 s-1 for the forward and reverse reactions, respectively, and were almost identical to those [(1.5 ± 0.1) × 10-5 s-1 and (3.5 ± 0.4) × 10-5 s-1] of sophorose. The rate constant of the decomposition reaction for kojibiose was (4.7 ± 1.1) × 10-7 s-1 whereas that for sophorose [(3.7 ± 0.2) × 10-6 s-1] was about ten times higher. The epimerization reaction was not significantly affected by the variation in the buffer except for a borate buffer, and depended instead upon the pH value (concentration of hydroxide ions), indicating that epimerization occurred as a function of the hydroxide ion. These instabilities are an extension of the neutral pH conditions for keto-enol tautomerization that are often observed under strong alkaline conditions.
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Affiliation(s)
- Kazuhiro Chiku
- Faculty of Applied Life Science, Nippon Veterinary and Life Science University
| | - Mami Wada
- Faculty of Applied Life Science, Nippon Veterinary and Life Science University
| | - Haruka Atsuji
- Faculty of Applied Life Science, Nippon Veterinary and Life Science University
| | - Arisa Hosonuma
- Faculty of Applied Life Science, Nippon Veterinary and Life Science University
| | - Mitsuru Yoshida
- Faculty of Applied Life Science, Nippon Veterinary and Life Science University
| | - Hiroshi Ono
- Advanced Analysis Center, National Agriculture and Food Research Organization
| | - Motomitsu Kitaoka
- Food Research Institute, National Agriculture and Food Research Organization
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8
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Kajiki T, Yoshinaga K, Komba S, Kitaoka M. Enzymatic Synthesis of 1,5-Anhydro-4- O-β-D-glucopyranosyl-D-fructose Using Cellobiose Phosphorylase and Its Spontaneous Decomposition via β-Elimination. J Appl Glycosci (1999) 2017; 64:91-97. [PMID: 34354501 PMCID: PMC8056936 DOI: 10.5458/jag.jag.jag-2017_010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 08/31/2017] [Indexed: 11/05/2022] Open
Abstract
Cellobiose phosphorylase from Cellvibrio gilvus was used to prepare 1,5-anhydro-4-O-β-D-glucopyranosyl-D-fructose [βGlc(1→4)AF] from 1,5-anhydro-D-fructose and α-D-glucose 1-phosphate. βGlc(1→4)AF decomposed into D-glucose and ascopyrone T via β-elimination. Higher pH and temperature caused faster decomposition. However, decomposition proceeded significantly even under mild conditions. For instance, the half-life of βGlc(1→4)AF was 17 h at 30 °C and pH 7.0. Because βGlc(1→4)AF is a mimic of cellulose, in which the C2 hydroxyl group is oxidized, such decomposition may occur in oxidized cellulose in nature. Here we propose a possible oxidizing pathway by which this occurs.
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Affiliation(s)
- Takahito Kajiki
- 1 Food Research Institute, National Agriculture and Food Research Organization.,2 Sunus Co., Ltd
| | | | - Shiro Komba
- 1 Food Research Institute, National Agriculture and Food Research Organization
| | - Motomitsu Kitaoka
- 1 Food Research Institute, National Agriculture and Food Research Organization
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9
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Kitaoka M. Synthesis of 3-Keto-levoglucosan Using Pyranose Oxidase and Its Spontaneous Decomposition via β-Elimination. J Appl Glycosci (1999) 2017; 64:99-107. [PMID: 34354502 PMCID: PMC8056934 DOI: 10.5458/jag.jag.jag-2017_013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 09/28/2017] [Indexed: 11/09/2022] Open
Abstract
3-Keto-levoglucosan (3ketoLG) has been postulated to be the product of a reaction catalyzed by levoglucosan dehydrogenase (LGDH), a bacterial enzyme involved in the metabolism of levoglucosan (LG). To investigate the LG metabolic pathway catalyzed by LGDH, 3ketoLG is needed. However, 3ketoLG has not been successfully isolated from the LGDH reaction. This study investigated the ability of pyranose oxidase to convert LG into 3ketoLG by oxidizing the C3 hydroxyl group. During the oxidation of LG, 3ketoLG was spontaneously crystallized in the reaction mixture. Starting with 500 mM LG, the isolation yield of 3ketoLG was 80 %. Nuclear magnetic resonance analyses revealed that a part of 3ketoLG dimerized in aqueous solution, explaining its poor solubility. Even under normal conditions, 3ketoLG was unstable in aqueous solution, with a half-life of 16 h at pH 7.0 and 30 °C. The decomposition proceeded through β-elimination of the C-O bonds at both C1 and C5, as evidenced by decomposition products. This instability explains the difficulty in obtaining 3ketoLG via the LGDH reaction.
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Affiliation(s)
- Motomitsu Kitaoka
- Food Research Institute, National Agriculture and Food Research Organization
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10
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Zheng XY, Peng JB, Livera MMVS, Luo Y, Wang YY, Kong XJ, Long LS, Zheng Z, Zheng LS. Selective Formation of Chromogen I from N-Acetyl-d-glucosamine upon Lanthanide Coordination. Inorg Chem 2016; 56:110-113. [DOI: 10.1021/acs.inorgchem.6b02589] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Xiu-Ying Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials,
State Key Laboratory of Physical Chemistry of Solid Surface, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jun-Bo Peng
- Collaborative Innovation Center of Chemistry for Energy Materials,
State Key Laboratory of Physical Chemistry of Solid Surface, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - M. M. Varuni S. Livera
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Yun Luo
- Collaborative Innovation Center of Chemistry for Energy Materials,
State Key Laboratory of Physical Chemistry of Solid Surface, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Ya-Yun Wang
- Collaborative Innovation Center of Chemistry for Energy Materials,
State Key Laboratory of Physical Chemistry of Solid Surface, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Xiang-Jian Kong
- Collaborative Innovation Center of Chemistry for Energy Materials,
State Key Laboratory of Physical Chemistry of Solid Surface, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - La-Sheng Long
- Collaborative Innovation Center of Chemistry for Energy Materials,
State Key Laboratory of Physical Chemistry of Solid Surface, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Zhiping Zheng
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Lan-Sun Zheng
- Collaborative Innovation Center of Chemistry for Energy Materials,
State Key Laboratory of Physical Chemistry of Solid Surface, and Department
of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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11
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Formation of type 4 resistant starch and maltodextrins from amylose and amylopectin upon dry heating: A model study. Carbohydr Polym 2016; 141:253-62. [DOI: 10.1016/j.carbpol.2016.01.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 12/09/2015] [Accepted: 01/01/2016] [Indexed: 01/02/2023]
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12
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Nihira T, Saito Y, Kitaoka M, Nishimoto M, Otsubo K, Nakai H. Characterization of a laminaribiose phosphorylase from Acholeplasma laidlawii PG-8A and production of 1,3-β-D-glucosyl disaccharides. Carbohydr Res 2012; 361:49-54. [PMID: 22982171 DOI: 10.1016/j.carres.2012.08.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Revised: 08/06/2012] [Accepted: 08/13/2012] [Indexed: 11/18/2022]
Abstract
We identified a glycoside hydrolase family 94 homolog (ACL0729) from Acholeplasma laidlawii PG-8A as a laminaribiose (1,3-β-D-glucobiose) phosphorylase (EC 2.4.1.31). The recombinant ACL0729 produced in Escherichia coli catalyzed phosphorolysis of laminaribiose with inversion of the anomeric configuration in a typical sequential bi bi mechanism releasing α-D-glucose 1-phosphate and D-glucose. Laminaritriose (1,3-β-D-glucotriose) was not an efficient substrate for ACL0729. The phosphorolysis is reversible, enabling synthesis of 1,3-β-D-glucosyl disaccharides by reverse phosphorolysis with strict regioselectivity from α-D-glucose 1-phosphate as the donor and suitable monosaccharide acceptors (D-glucose, 2-deoxy-D-arabino-hexopyranose, D-xylose, D-glucuronic acid, 1,5-anhydro-D-glucitol, and D-mannose) with C-3 and C-4 equatorial hydroxyl groups. The D-glucose and 2-deoxy-D-arabino-hexopyranose caused significantly strong competitive substrate inhibition compared with other glucobiose phosphorylases reported, in which the acceptor competitively inhibited the binding of the donor substrate. By contrast, none of the examined disaccharides served as acceptor in the synthetic reaction.
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Affiliation(s)
- Takanori Nihira
- Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan
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13
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Sato T, Hasegawa N, Saito J, Umezawa S, Honda Y, Kino K, Kirimura K. Purification, characterization, and gene identification of an α-glucosyl transfer enzyme, a novel type α-glucosidase from Xanthomonas campestris WU-9701. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcatb.2012.04.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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14
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Yoshida E, Sakurama H, Kiyohara M, Nakajima M, Kitaoka M, Ashida H, Hirose J, Katayama T, Yamamoto K, Kumagai H. Bifidobacterium longum subsp. infantis uses two different β-galactosidases for selectively degrading type-1 and type-2 human milk oligosaccharides. Glycobiology 2011; 22:361-8. [PMID: 21926104 DOI: 10.1093/glycob/cwr116] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The breast-fed infant intestine is often colonized by particular bifidobacteria, and human milk oligosaccharides (HMOs) are considered to be bifidogenic. Recent studies showed that Bifidobacterium longum subsp. infantis can grow on HMOs as the sole carbon source. This ability has been ascribed to the presence of a gene cluster (HMO cluster-1) contained in its genome. However, the metabolism of HMOs by the organism remains unresolved because no enzymatic studies have been completed. In the present study, we characterized β-galactosidases of this subspecies to understand how the organism degrades type-1 (Galβ1-3GlcNAc) and type-2 (Galβ1-4GlcNAc) isomers of HMOs. The results revealed that the locus tag Blon_2016 gene, which is distantly located from the HMO cluster-1, encodes a novel β-galactosidase (Bga42A) with a significantly higher specificity for lacto-N-tetraose (LNT; Galβ1-3GlcNAcβ1-3Galβ1-4Glc) than for lacto-N-biose I (Galβ1-3GlcNAc), lactose (Lac) and type-2 HMOs. The proposed name of Bga42A is LNT β-1,3-galactosidase. The Blon_2334 gene (Bga2A) located within the HMO cluster-1 encodes a β-galactosidase specific for Lac and type-2 HMOs. Real-time quantitative reverse transcription-polymerase chain reaction analysis revealed the physiological significance of Bga42A and Bga2A in HMO metabolism. The organism therefore uses two different β-galactosidases to selectively degrade type-1 and type-2 HMOs. Despite the quite rare occurrence in nature of β-galactosidases acting on type-1 chains, the close homologs of Bga42A were present in the genomes of infant-gut associated bifidobacteria that are known to consume LNT. The predominance of type-1 chains in HMOs and the conservation of Bga42A homologs suggest the coevolution of these bifidobacteria with humans.
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Affiliation(s)
- Erina Yoshida
- Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836, Japan
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15
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Inoue K, Nishimoto M, Kitaoka M. One-pot enzymatic production of 2-acetamido-2-deoxy-D-galactose (GalNAc) from 2-acetamido-2-deoxy-D-glucose (GlcNAc). Carbohydr Res 2011; 346:2432-6. [PMID: 21955790 DOI: 10.1016/j.carres.2011.08.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Revised: 08/31/2011] [Accepted: 08/31/2011] [Indexed: 10/17/2022]
Abstract
2-Acetamido-2-deoxy-D-galactose (GalNAc) is a common monosaccharide found in biologically functional sugar chains, but its availability is often limited due to the lack of abundant natural sources. In order to produce GalNAc from abundantly available sugars, 2-acetamido-2-deoxy-D-glucose (GlcNAc) was converted to GalNAc by a one-pot reaction using three enzymes involved in the galacto-N-biose/lacto-N-biose I pathway of bifidobacteria. Starting the reaction with 600 mM GlcNAc, 170 mM GalNAc was produced at equilibrium in the presence of catalytic amounts of ATP and UDP-Glc under optimized conditions. GalNAc was separated from GlcNAc using water-eluting cation-exchange chromatography with a commonly available cation-exchange resin.
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Affiliation(s)
- Kousuke Inoue
- National Food Research Institute, National Agriculture and Food Research Organization, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan
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