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Title: Surface glycan-binding proteins are essential for cereal beta-glucan utilization by the human gut symbiont Bacteroides ovatus

Abstract

The human gut microbiota, which underpins nutrition and systemic health, is compositionally sensitive to the availability of complex carbohydrates in the diet. The Bacteroidetes comprise a dominant phylum in the human gut microbiota whose members thrive on dietary and endogenous glycans by employing a diversity of highly specific, multi-gene polysaccharide utilization loci (PUL), which encode a variety of carbohydrases, transporters, and sensor/regulators. PULs invariably also encode surface glycan-binding proteins (SGBPs) that play a central role in saccharide capture at the outer membrane. Here, we present combined biophysical, structural, and in vivo characterization of the two SGBPs encoded by the Bacteroides ovatus mixed-linkage β-glucan utilization locus (MLGUL), thereby elucidating their key roles in the metabolism of this ubiquitous dietary cereal polysaccharide. In particular, molecular insight gained through several crystallographic complexes of SGBP-A and SGBP-B with oligosaccharides reveals that unique shape complementarity of binding platforms underpins specificity for the kinked MLG backbone vis-à-vis linear β-glucans. Reverse-genetic analysis revealed that both the presence and binding ability of the SusD homolog BoSGBPMLG-A are essential for growth on MLG, whereas the divergent, multi-domain BoSGBPMLG-B is dispensable but may assist in oligosaccharide scavenging from the environment. Overall, the synthesis of these data illuminates the critical rolemore » SGBPs play in concert with other MLGUL components, reveals new structure–function relationships among SGBPs, and provides fundamental knowledge to inform future (meta)genomic, biochemical, and microbiological analyses of the human gut microbiota.« less

Authors:
 [1];  [2];  [1];  [1];  [2];  [2];  [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. of British Columbia, Vancouver, BC (Canada)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH)
OSTI Identifier:
1573405
Grant/Contract Number:  
AC02–06CH11357; AC02–76SF00515; P41GM103393
Resource Type:
Accepted Manuscript
Journal Name:
Cellular and Molecular Life Sciences
Additional Journal Information:
Journal Volume: 76; Journal Issue: 21; Journal ID: ISSN 1420-682X
Country of Publication:
United States
Language:
ENGLISH
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Tamura, Kazune, Foley, Matthew H., Gardill, Bernd R., Dejean, Guillaume, Schnizlein, Matthew, Bahr, Constance E., Louise Creagh, A., van Petegem, Filip, Koropatkin, Nicole M., and Brumer, Harry. Surface glycan-binding proteins are essential for cereal beta-glucan utilization by the human gut symbiont Bacteroides ovatus. United States: N. p., 2019. Web. doi:10.1007/s00018-019-03115-3.
Tamura, Kazune, Foley, Matthew H., Gardill, Bernd R., Dejean, Guillaume, Schnizlein, Matthew, Bahr, Constance E., Louise Creagh, A., van Petegem, Filip, Koropatkin, Nicole M., & Brumer, Harry. Surface glycan-binding proteins are essential for cereal beta-glucan utilization by the human gut symbiont Bacteroides ovatus. United States. https://doi.org/10.1007/s00018-019-03115-3
Tamura, Kazune, Foley, Matthew H., Gardill, Bernd R., Dejean, Guillaume, Schnizlein, Matthew, Bahr, Constance E., Louise Creagh, A., van Petegem, Filip, Koropatkin, Nicole M., and Brumer, Harry. Mon . "Surface glycan-binding proteins are essential for cereal beta-glucan utilization by the human gut symbiont Bacteroides ovatus". United States. https://doi.org/10.1007/s00018-019-03115-3. https://www.osti.gov/servlets/purl/1573405.
@article{osti_1573405,
title = {Surface glycan-binding proteins are essential for cereal beta-glucan utilization by the human gut symbiont Bacteroides ovatus},
author = {Tamura, Kazune and Foley, Matthew H. and Gardill, Bernd R. and Dejean, Guillaume and Schnizlein, Matthew and Bahr, Constance E. and Louise Creagh, A. and van Petegem, Filip and Koropatkin, Nicole M. and Brumer, Harry},
abstractNote = {The human gut microbiota, which underpins nutrition and systemic health, is compositionally sensitive to the availability of complex carbohydrates in the diet. The Bacteroidetes comprise a dominant phylum in the human gut microbiota whose members thrive on dietary and endogenous glycans by employing a diversity of highly specific, multi-gene polysaccharide utilization loci (PUL), which encode a variety of carbohydrases, transporters, and sensor/regulators. PULs invariably also encode surface glycan-binding proteins (SGBPs) that play a central role in saccharide capture at the outer membrane. Here, we present combined biophysical, structural, and in vivo characterization of the two SGBPs encoded by the Bacteroides ovatus mixed-linkage β-glucan utilization locus (MLGUL), thereby elucidating their key roles in the metabolism of this ubiquitous dietary cereal polysaccharide. In particular, molecular insight gained through several crystallographic complexes of SGBP-A and SGBP-B with oligosaccharides reveals that unique shape complementarity of binding platforms underpins specificity for the kinked MLG backbone vis-à-vis linear β-glucans. Reverse-genetic analysis revealed that both the presence and binding ability of the SusD homolog BoSGBPMLG-A are essential for growth on MLG, whereas the divergent, multi-domain BoSGBPMLG-B is dispensable but may assist in oligosaccharide scavenging from the environment. Overall, the synthesis of these data illuminates the critical role SGBPs play in concert with other MLGUL components, reveals new structure–function relationships among SGBPs, and provides fundamental knowledge to inform future (meta)genomic, biochemical, and microbiological analyses of the human gut microbiota.},
doi = {10.1007/s00018-019-03115-3},
journal = {Cellular and Molecular Life Sciences},
number = 21,
volume = 76,
place = {United States},
year = {Mon May 06 00:00:00 EDT 2019},
month = {Mon May 06 00:00:00 EDT 2019}
}

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Works referencing / citing this record:

Adaptation of Syntenic Xyloglucan Utilization Loci of Human Gut Bacteroidetes to Polysaccharide Side Chain Diversity
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