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Endo‐α‐Mannosidase‐Catalyzed Transglycosylation |
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| Authors: | Shogo Iwamoto Yuta Kasahara Prof?Dr Yayoi Yoshimura Dr Akira Seko Prof?Dr Yoichi Takeda Prof?Dr Yukishige Ito Prof?Dr Kiichiro Totani Prof?Dr Ichiro Matsuo |
| Affiliation: | 1. Graduate School of Science and Technology, Gunma University, Kiryu, Gunma, Japan;2. ERATO Science and Technology Agency, JST), Ito Glycotrilogy Project, Wako, Saitama, Japan;3. Department of Biotechnology, Ritsumeikan University, Shiga, Japan;4. Synthetic Cellular Chemistry Laboratory, RIKEN, Wako, Saitama, Japan;5. Department of Materials and Life Science, Seikei University, Musashino, Tokyo, Japan |
| Abstract: | In order for facilitating the synthesis of oligosaccharides, transglycosylation reactions mediated by glycoside hydrolases have been studied in various contexts. In this study, we examined the transglycosylating activity of a Golgi endo ‐ α‐mannosidase. We prepared various glycosyl donors and acceptors, and recombinant human Golgi endo‐α‐mannosidase and its various mutants were expressed. The enzyme was able to mediate transglycosylation from α‐glycosyl‐fluorides. Systematic screening of various point mutants revealed that the E407D mutant had excellent transglycosylation activity and extremely low hydrolytic activity. Substrate specificity analysis revealed that minimum motif required for glycosyl acceptor is Manα1– 2Man. The synthetic utility of the enzyme was demonstrated by generation of a high‐mannose‐type undecasaccharide (Glc1Man9GlcNAc2). |
| Keywords: | enzymes glycosylation glycosynthases oligosaccharides transglycosylation |