Cited by 134Polysaccharides Composition and ApplicationsProbiotics and Fermented FoodsEscherichia coli research studies

Structure and Biosynthesis of Two Exopolysaccharides Produced by Lactobacillus johnsonii FI9785

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Dertli, Enes, Colquhoun, Ian J., Gunning, A. Patrick, Bongaerts, Roy J., Le Gall, Gwénaëlle, Bonev, Boyan B., Mayer, Melinda J., Narbad, Arjan·2013·Journal of Biological Chemistry

Abstract

Exopolysaccharides were isolated and purified from Lactobacillus johnsonii FI9785, which has previously been shown to act as a competitive exclusion agent to control Clostridium perfringens in poultry. Structural analysis by NMR spectroscopy revealed that L. johnsonii FI9785 can produce two types of exopolysaccharide: EPS-1 is a branched dextran with the unusual feature that every backbone residue is substituted with a 2-linked glucose unit, and EPS-2 was shown to have a repeating unit with the following structure: -6)-α-Glc p -(1–3)-β-Glc p -(1–5)-β-Gal f -(1–6)-α-Glc p -(1–4)-β-Gal p -(1–4)-β-Glc p -(1-. Sites on both polysaccharides were partially occupied by substituent groups: 1-phosphoglycerol and O -acetyl groups in EPS-1 and a single O -acetyl group in EPS-2. Analysis of a deletion mutant (Δ epsE ) lacking the putative priming glycosyltransferase gene located within a predicted eps gene cluster revealed that the mutant could produce EPS-1 but not EPS-2, indicating that epsE is essential for the biosynthesis of EPS-2. Atomic force microscopy confirmed the localization of galactose residues on the exterior of wild type cells and their absence in the Δ epsE mutant. EPS2 was found to adopt a random coil structural conformation. Deletion of the entire 14-kb eps cluster resulted in an acapsular mutant phenotype that was not able to produce either EPS-2 or EPS-1. Alterations in the cell surface properties of the EPS-specific mutants were demonstrated by differences in binding of an anti-wild type L. johnsonii antibody. These findings provide insights into the biosynthesis and structures of novel exopolysaccharides produced by L. johnsonii FI9785, which are likely to play an important role in biofilm formation, protection against harsh environment of the gut, and colonization of the host. Background: Bacterial cell surface polysaccharides are important in pathogenesis, cell adhesion, and protection against harsh environments. Results: Two novel exopolysaccharide (EPS) structures were identified in Lactobacillus johnsonii . Conclusion: The eps cluster is essential for production of both EPS, but epsE is required only for the heteropolymer. Significance: This study will guide functional analysis of EPS in survival and colonization of gut commensals.

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  • EPS produced by Lb. johnsonii FI9785 may favor colonization of probiotic bacteria in the host gastrointestinal tract by replacing pathogenic bacteria in a competitive inhibition mode.

    “EPS produced by Lb. johnsonii FI9785 may favor the colonization of probiotic bacteria in the host gastrointestinal tract by replacing pathogenic bacteria in a competitive inhibition mode [145].”

    From Lactic Acid Bacteria Exopolysaccharides Producers: A Sustainable Tool for Functional Foods (2021) · cites this paper as [145]

    The Introduction says L. johnsonii FI9785 out-competes pathogens in challenge models, while the Discussion suggests its EPS may aid survival during gut transit and affect colonization. The paper says the mechanism of pathogen exclusion is unknown and leaves the EPS’s role in it for future study; it does not establish that EPS replaces pathogens through competitive inhibition. (LLM, conf=0.88)

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Authors
Dertli, E., Colquhoun, I. J., Gunning, A. P., Bongaerts, R. J., Le Gall, G., Bonev, B. B., Mayer, M. J., & Narbad, A.
Affiliations
  • Quadram Institute (GB)
  • University of Nottingham (GB)
Corresponding author
Mayer, Melinda J.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2013-11
Volume
288
Issue
44
Pages
31938-31951
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1964087334
Cited by
134
References
58
Citations by year
2026: 13 · 2025: 13 · 2024: 4 · 2023: 13 · 2022: 11 · 2021: 10 · 2020: 14 · 2019: 13 · 2018: 10 · 2017: 11 · 2016: 4 · 2015: 14 · 2014: 4
FWCI
10.85
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DSpace@Bayburt (submittedVersion, cc-by-nc-nd)
  • UEA Digital Repository (University of East Anglia) (submittedVersion)
Funders
Biotechnology and Biological Sciences Research Council ((BB/J004529/1, BBS/E/F/00044453, BB/J004545/1)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Polysaccharides Composition and Applications
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
Keywords
exopolysaccharides, exopolysaccharide biosynthesis, heteropolymers, galactose substitution, O-acetylation, cell surface polysaccharides, biofilm formation
MeSH terms
Bacterial Proteins, Carbohydrate Conformation, Genes, Bacterial, Multigene Family, Glucosyltransferases, Lactobacillus, Mutation, Polysaccharides, Bacterial

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