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The mannobiose-forming exo-mannanase involved in a new mannan catabolic pathway in Bacteroides fragilis

The mannobiose-forming exo-mannanase involved in a new mannan catabolic pathway in Bacteroides... We have proposed a new mannan catabolic pathway in Bacteroides fragilis NCTC 9343 that involves a putative mannanase ManA in glycoside hydrolase family 26 (BF0771), a mannobiose and/or sugar transporter (BF0773), mannobiose 2-epimerase (BF0774), and mannosylglucose phosphorylase (BF0772). If this hypothesis is correct, ManA has to generate mannobiose from mannans as the major end product. In this study, the BF0771 gene from the B. fragili s genome was cloned and expressed in Escherichia coli cells. The expressed protein was found to produce mannobiose exclusively from mannans and initially from manno-oligosaccharides. Production of 4- O -β- d -glucopyranosyl- d -mannose or 4- O -β- d -mannopyranosyl- d -glucose from mannans was not detectable. The results indicate that this enzyme is a novel mannobiose-forming exo-mannanase, consistent with the new microbial mannan catabolic pathway we proposed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Microbiology Springer Journals

The mannobiose-forming exo-mannanase involved in a new mannan catabolic pathway in Bacteroides fragilis

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References (25)

Publisher
Springer Journals
Copyright
Copyright © 2014 by Springer-Verlag Berlin Heidelberg
Subject
Life Sciences; Microbiology; Microbial Ecology; Biochemistry, general; Cell Biology; Biotechnology; Ecology
ISSN
0302-8933
eISSN
1432-072X
DOI
10.1007/s00203-013-0938-y
pmid
24217874
Publisher site
See Article on Publisher Site

Abstract

We have proposed a new mannan catabolic pathway in Bacteroides fragilis NCTC 9343 that involves a putative mannanase ManA in glycoside hydrolase family 26 (BF0771), a mannobiose and/or sugar transporter (BF0773), mannobiose 2-epimerase (BF0774), and mannosylglucose phosphorylase (BF0772). If this hypothesis is correct, ManA has to generate mannobiose from mannans as the major end product. In this study, the BF0771 gene from the B. fragili s genome was cloned and expressed in Escherichia coli cells. The expressed protein was found to produce mannobiose exclusively from mannans and initially from manno-oligosaccharides. Production of 4- O -β- d -glucopyranosyl- d -mannose or 4- O -β- d -mannopyranosyl- d -glucose from mannans was not detectable. The results indicate that this enzyme is a novel mannobiose-forming exo-mannanase, consistent with the new microbial mannan catabolic pathway we proposed.

Journal

Archives of MicrobiologySpringer Journals

Published: Jan 1, 2014

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