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Helicobacter pylori Peptidoglycan Modifications Confer Lysozyme Resistance and Contribute to Survival in the Host

Journal Article · · mBio (Online)
 [1];  [2];  [3];  [2]
  1. Univ. of Georgia, Athens, GA (United States). Dept. of Microbiology; DOE/OSTI
  2. Univ. of Georgia, Athens, GA (United States). Dept. of Microbiology
  3. Univ. of Georgia, Athens, GA (United States). The Complex Carbohydrate Research Center

The prominent host muramidase lysozyme cleaves bacterial peptidoglycan (PG), and the enzyme is abundant in mucosal secretions. The lytic enzyme susceptibility of Gram-negative bacteria and mechanisms they use to thwart lytic enzyme activity are poorly studied. We previously characterized a Helicobacter pylori PG modification enzyme, an N-deacetylase (PgdA) involved in lysozyme resistance. In this study, another PG modification enzyme, a putative PG O-acetyltransferase (PatA), was identified. Mass spectral analysis of the purified PG demonstrated that a patA strain contained a greatly reduced amount of acetylated muropeptides, indicating a role for PatA in H. pylori PG O-acetylation. The PG modification mutant strains (pgdA, patA, or pgdA patA) were more susceptible to lysozyme killing than the parent, but this assay required high lysozyme levels (up to 50 mg/ml). However, addition of host lactoferrin conferred lysozyme sensitivity to H. pylori, at physiologically relevant concentrations of both host components (3 mg/ml lactoferrin plus 0.3 mg/ml lysozyme). The pgdA patA double mutant strain was far more susceptible to lysozyme/lactoferrin killing than the parent. Peptidoglycan purified from a pgdA patA mutant was five times more sensitive to lysozyme than PG from the parent strain, while PG from both single mutants displayed intermediate sensitivity. Both sensitivity assays for whole cells and for purified PGs indicated that the modifications mediated by PgdA and PatA have a synergistic effect, conferring lysozyme tolerance. In a mouse infection model, significant colonization deficiency was observed for the double mutant at 3 weeks postinoculation. The results show that PG modifications affect the survival of a Gram-negative pathogen.

Research Organization:
Univ. of Georgia, Athens, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-93ER20097
OSTI ID:
1626104
Journal Information:
mBio (Online), Journal Name: mBio (Online) Journal Issue: 6 Vol. 3; ISSN 2150-7511
Publisher:
American Society for Microbiology (ASM)Copyright Statement
Country of Publication:
United States
Language:
English

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Comparative genome analysis of Weissella ceti, an emerging pathogen of farm-raised rainbow trout journal December 2015
Biochemical Characterization of Hypothetical Proteins from Helicobacter pylori journal June 2013
Helicobacter pylori cag Pathogenicity Island's Role in B7-H1 Induction and Immune Evasion journal March 2015
Biochemical characterization of the Helicobacter pylori bactofilin-homolog HP1542 journal June 2019
In vitro characterization of the antivirulence target of Gram-positive pathogens, peptidoglycan O-acetyltransferase A (OatA) journal October 2017
Mechanistic Pathways for Peptidoglycan O-Acetylation and De-O-Acetylation journal October 2018
Comparative Analysis of Peptidoglycans From Pseudomonas aeruginosa Isolates Recovered From Chronic and Acute Infections journal August 2019
Human Lysozyme Synergistically Enhances Bactericidal Dynamics and Lowers the Resistant Mutant Prevention Concentration for Metronidazole to Helicobacter pylori by Increasing Cell Permeability journal October 2016
Morphology of Helicobacter pylori as a result of peptidoglycan and cytoskeleton rearrangements journal January 2018
Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2011-2012: ANALYSIS OF CARBOHYDRATES AND GLYCOCONJUGATES journal August 2015
Identification of novel Legionella genes required for endosymbiosis in Paramecium based on comparative genome analysis with Holospora spp. journal August 2018
Peptidoglycan recycling contributes to intrinsic resistance to fosfomycin in Acinetobacter baumannii journal August 2018
A novel peptidoglycan D,L-endopeptidase induced by S almonella inside eukaryotic cells contributes to virulence: Peptidoglycan of intracellular Salmonella journal November 2015
Aconitase-Mediated Posttranscriptional Regulation of Helicobacter pylori Peptidoglycan Deacetylase journal September 2013
Hydrogen Metabolism in Helicobacter pylori Plays a Role in Gastric Carcinogenesis through Facilitating CagA Translocation journal August 2016
Interplay between Peptidoglycan Biology and Virulence in Gram-Negative Pathogens journal September 2018
From bacterial killing to immune modulation: Recent insights into the functions of lysozyme journal September 2017
Development of a High Throughput Screen for the Identification of Inhibitors of Peptidoglycan O-Acetyltransferases, New Potential Antibacterial Targets journal May 2019
Peptidoglycan O-Acetylation as a Virulence Factor: Its Effect on Lysozyme in the Innate Immune System journal July 2019

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