Function and structure of GH13_31 α-glucosidase with high α-(1→4)-glucosidic linkage specificity and transglucosylation activity

Waraporn Auiewiriyanukul, Wataru Saburi, Koji Kato, Min Yao, Haruhide Mori

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

α-Glucosidase hydrolyzes α-glucosides and transfers α-glucosyl residues to an acceptor through transglucosylation. In this study, GH13_31 α-glucosidase BspAG13_31A with high transglucosylation activity is reported in Bacillus sp. AHU2216 and biochemically and structurally characterized. This enzyme is specific to α-(1→4)-glucosidic linkage as substrates and transglucosylation products. Maltose is the most preferred substrate. Crystal structures of BspAG13_31A wild-type for the substrate-free form and inactive acid/base mutant E256Q in complexes with maltooligosaccharides were solved at 1.6–2.5 Å resolution. BspAG13_31A has a catalytic domain folded by an (β/α)8-barrel. In subsite +1, Ala200 and His203 on β→α loop 4 and Asn258 on β→α loop 5 are involved in the recognition of maltooligosaccharides. Structural basis for specificity of GH13_31 enzymes to α-(1→4)-glucosidic linkage is first described.

Original languageEnglish
Pages (from-to)2268-2281
Number of pages14
JournalFEBS Letters
Volume592
Issue number13
DOIs
Publication statusPublished - Jul 1 2018
Externally publishedYes

Keywords

  • glycoside hydrolase family 13
  • transglycosylation
  • α-glucosidase

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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