Elucidation of a novel Vibrio cholerae lipid A secondary hydroxy-acyltransferase and its role in innate immune recognition

Jessica V. Hankins, James A. Madsen, David K. Giles, Brandon M. Childers, Karl E. Klose, Jennifer S. Brodbelt, M. Stephen Trent

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Similar to most Gram-negative bacteria, the outer leaflet of the outer membrane of Vibrio cholerae is comprised of lipopolysaccharide. Previous reports have proposed that V.cholerae serogroups O1 and O139 synthesize structurally different lipid A domains, which anchor lipopolysaccharide within the outer membrane. In the current study, intact lipid A species of V.cholerae O1 and O139 were analysed by mass spectrometry. We demonstrate that V.cholerae serogroups associated with human disease synthesize a similar asymmetrical hexa-acylated lipid A species, bearing a myristate (C14:0) and 3-hydroxylaurate (3-OH C12:0) at the 2'- and 3'-positions respectively. A previous report from our laboratory characterized the V.cholerae LpxL homologue Vc0213, which transfers a C14:0 to the 2'-position of the glucosamine disaccharide. Our current findings identify V.cholerae Vc0212 as a novel lipid A secondary hydroxy-acyltransferase, termed LpxN, responsible for transferring the 3-hydroxylaurate (3-OH C12:0) to the V.cholerae lipid A domain. Importantly, the presence of a 3-hydroxyl group on the 3'-linked secondary acyl chain was found to promote antimicrobial peptide resistance in V.cholerae; however, this functional group was not required for activation of the innate immune response.

Original languageEnglish (US)
Pages (from-to)1313-1329
Number of pages17
JournalMolecular Microbiology
Volume81
Issue number5
DOIs
StatePublished - Sep 2011

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

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