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Title: L isteria monocytogenes exopolysaccharide: origin, structure, biosynthetic machinery and c‐di‐ GMP ‐dependent regulation

Journal Article · · Molecular Microbiology
DOI:https://doi.org/10.1111/mmi.12966· OSTI ID:1401610
 [1];  [2];  [2];  [3];  [1];  [3];  [1];  [1]
  1. Department of Molecular Biology University of Wyoming Laramie WY 82071 USA
  2. Complex Carbohydrate Research Center University of Georgia Athens Georgia 30602 USA
  3. Department of Chemistry University of Wyoming Laramie WY 82071 USA

Summary Elevated levels of the second messenger c‐di‐ GMP activate biosynthesis of an unknown exopolysaccharide ( EPS ) in the food‐borne pathogen L isteria monocytogenes . This EPS strongly protects cells against disinfectants and desiccation, indicating its potential significance for listerial persistence in the environment and for food safety. We analyzed the potential phylogenetic origin of this EPS , determined its complete structure, characterized genes involved in its biosynthesis and hydrolysis and identified diguanylate cyclases activating its synthesis. Phylogenetic analysis of EPS biosynthesis proteins suggests that they have evolved within monoderms. Scanning electron microscopy revealed that L . monocytogenes   EPS is cell surface‐bound. Secreted carbohydrates represent exclusively cell‐wall debris. Based on carbohydrate composition, linkage and NMR analysis, the structure of the purified EPS is identified as a β‐1,4‐linked N ‐acetylmannosamine chain decorated with terminal α‐1,6‐linked galactose. All genes of the pss A ‐ E operon are required for EPS production and so is a separately located pss Z gene. We show that P ss Z has an EPS ‐specific glycosylhydrolase activity. Exogenously added P ss Z prevents EPS ‐mediated cell aggregation and disperses preformed aggregates, whereas an E72Q mutant in the presumed catalytic residue is much less active. The diguanylate cyclases D gc A and D gc B , whose genes are located next to pss Z , are primarily responsible for c‐di‐ GMP ‐dependent EPS production.

Sponsoring Organization:
USDOE
OSTI ID:
1401610
Journal Information:
Molecular Microbiology, Journal Name: Molecular Microbiology Vol. 96 Journal Issue: 4; ISSN 0950-382X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
FAO
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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