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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Transcriptomic analyses of xylan degradation by Prevotella bryantii and insights into energy acquisition by xylanolytic bacteroidetes
Journal of Biological Chemistry, Volume 285, No. 39, Year 2010
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Description
Enzymatic depolymerization of lignocellulose by microbes in the bovine rumen and the human colon is critical to gut health and function within the host. Prevotella bryantii B14 is a rumen bacterium that efficiently degrades soluble xylan. To identify the genes harnessed by this bacterium to degrade xylan, the transcriptomes of P. bryantii cultured on either wheat arabinoxylan or a mixture of its monosaccharide components were compared by DNA microarray and RNA sequencing approaches. The most highly induced genes formed a cluster that contained putative outer membrane proteins analogous to the starch utilization system identified in the prominent human gut symbiont Bacteroides thetaiotaomicron. The arrangement of genes in the cluster was highly conserved in other xylanolytic Bacteroidetes, suggesting that the mechanism employed by xylan utilizers in this phylum is conserved. A number of genes encoding proteins with unassigned function were also induced on wheat arabinoxylan. Among these proteins, a hypothetical protein with low similarity to glycoside hydrolases was shown to possess endoxylanase activity and subsequently assigned to glycoside hydrolase family 5. The enzyme was designated PbXyn5A. Two of the most similar proteins to PbXyn5A were hypothetical proteins from human colonic Bacteroides spp., and when expressed each protein exhibited endoxylanase activity. By using site-directed mutagenesis, we identified two amino acid residues that likely serve as the catalytic acid/base and nucleophile as in other GH5 proteins. This study therefore provides insights into capture of energy by xylanolytic Bacteroidetes and the application of their enzymes as a resource in the biofuel industry. © 2010 by The American Society for Biochemistry and Molecular Biology, Inc.
Available Materials
https://efashare.b-cdn.net/share/pmc/articles/PMC2943253/bin/supp_285_39_30261__index.html
https://efashare.b-cdn.net/share/pmc/articles/PMC2943253/bin/supp_M110.141788_jbc.M110.141788-1.doc
Authors & Co-Authors
Dodd, Dylan
United States, Urbana
School of Molecular and Cellular Biology
United States, Urbana
University of Illinois Urbana-champaign
Swaminathan, Kankshita
United States, Urbana
University of Illinois Urbana-champaign
Mackie, Roderick Ian
United States, Urbana
University of Illinois Urbana-champaign
Cann, Isaac K.O.
United States, Urbana
School of Molecular and Cellular Biology
United States, Urbana
University of Illinois Urbana-champaign
Statistics
Citations: 94
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1074/jbc.M110.141788
ISSN:
00219258
Research Areas
Genetics And Genomics