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A β-mannan utilisation locus in Bacteroides ovatus involves a GH36 α-galactosidase active on galactomannans

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Author

  • Sumitha Krishnaswamyreddy
  • Viktoria Bågenholm
  • Nicholas A Pudlo
  • Hanene Bouraoui
  • Nicole M Koropatkin
  • Eric C Martens
  • Henrik Stålbrand

Summary, in English

The Bacova_02091 gene in the β-mannan utilisation locus of Bacteroides ovatus encodes a family GH36 α-galactosidase (BoGal36A), transcriptionally upregulated during growth on galactomannan. Characterisation of recombinant BoGal36A reveals unique properties compared to other GH36 α-galactosidases, which preferentially hydrolyse terminal α-galactose in raffinose family oligosaccharides. BoGal36A prefers hydrolysing internal galactose substitutions from intact and depolymerized galactomannan. BoGal36A efficiently releases (>90%) galactose from guar and locust bean galactomannans, resulting in precipitation of the polysaccharides. As compared to other GH36 structures, the BoGal36A 3D model displays a loop deletion, resulting in a wider active site cleft which likely can accommodate a galactose-substituted polymannose backbone. This article is protected by copyright. All rights reserved.

Publishing year

2016-06-11

Language

English

Pages

2106-2118

Publication/Series

FEBS Letters

Volume

590

Issue

14

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Structural Biology
  • Biochemistry and Molecular Biology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-3468