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Discovery and characterization of family 39 glycoside hydrolases from rumen anaerobic fungi with polyspecific activity on rare arabinosyl substrates


Discovery and characterization of family 39 glycoside hydrolases from rumen anaerobic fungi with polyspecific activity on rare arabinosyl substrates

Jones, Darryl R., Uddin, Muhammed Salah, Gruninger, Robert J., Pham, Thi Thanh My, Thomas, Dallas, Boraston, Alisdair B., Briggs, Jonathan, Pluvinage, Benjamin, McAllister, Tim A., Forster, Robert J., Tsang, Adrian, Selinger, L. Brent and Abbott, D. Wade (2017) Discovery and characterization of family 39 glycoside hydrolases from rumen anaerobic fungi with polyspecific activity on rare arabinosyl substrates. Journal of Biological Chemistry, 292 (30). pp. 12606-12620. ISSN 0021-9258

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Official URL: http://dx.doi.org/10.1074/jbc.M117.789008


Enzyme activities that improve digestion of recalcitrant plant cell wall polysaccharides may offer solutions for sustainable industries. To this end, anaerobic fungi in the rumen have been identified as a promising source of novel carbohydrate active enzymes (CAZymes) that modify plant cell wall polysaccharides and other complex glycans. Many CAZymes share insufficient sequence identity to characterized proteins from other microbial ecosystems to infer their function; thus presenting challenges to their identification. In this study, four rumen fungal genes (nf2152, nf2215, nf2523, and pr2455) were identified that encode family 39 glycoside hydrolases (GH39s), and have conserved structural features with GH51s. Two recombinant proteins, NF2152 and NF2523, were characterized using a variety of biochemical and structural techniques, and were determined to have distinct catalytic activities. NF2152 releases a single product, β1,2-arabinobiose (Ara2) from sugar beet arabinan (SBA), and β1,2-Ara2 and α-1,2-galactoarabinose (Gal-Ara) from rye arabinoxylan (RAX). NF2523 exclusively releases α-1,2-Gal-Ara from RAX, which represents the first description of a galacto-(α-1,2)-arabinosidase. Both β-1,2-Ara2 and α-1,2-Gal-Ara are disaccharides not previously described within SBA and RAX. In this regard, the enzymes studied here may represent valuable new biocatalytic tools for investigating the structures of rare arabinosyl-containing glycans, and potentially for facilitating their modification in industrial applications.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Authors:Jones, Darryl R. and Uddin, Muhammed Salah and Gruninger, Robert J. and Pham, Thi Thanh My and Thomas, Dallas and Boraston, Alisdair B. and Briggs, Jonathan and Pluvinage, Benjamin and McAllister, Tim A. and Forster, Robert J. and Tsang, Adrian and Selinger, L. Brent and Abbott, D. Wade
Journal or Publication:Journal of Biological Chemistry
Date:6 June 2017
  • Agriculture and Agri-Food Canada (AAFC) through Agriculture Innovation Program Grant AIP-P022 and Elanco Animal Health
  • Natural Sciences and Engineering Research Council of Canada Discovery Grant FRN 04355 (to A. B. B.)
Digital Object Identifier (DOI):10.1074/jbc.M117.789008
Keywords:carbohydrate, enzyme, fungi, galactose, glycoside hydrolase, arabinose, rumen
ID Code:983684
Deposited By: Monique Lane
Deposited On:05 Apr 2018 19:41
Last Modified:06 Jun 2018 00:00


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