Repression of the inner membrane lipoprotein NlpA by Rns in enterotoxigenic Escherichia coli

Maria D. Bodero, M. Carolina Pilonieta, George P. Munson

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The expression of the inner membrane protein NlpA is repressed by the enterotoxigenic Escherichia coli (ETEC) virulence regulator Rns, a member of the AraC/XylS family. The Rns homologs CfaD from ETEC and AggR from enteroaggregative E. coli also repress expression of nlpA. In vitro DNase I and potassium permanganate footprinting revealed that Rns binds to a site overlapping the start codon of nlpA, preventing RNA polymerase from forming an open complex at nlpAp. A second Rns binding site between positions -152 and -195 relative to the nlpA transcription start site is not required for repression. NlpA is not essential for growth of E. coli under laboratory conditions, but it does contribute to the biogenesis of outer membrane vesicles. As outer membrane vesicles have been shown to contain ETEC heat-labile toxin, the repression of nlpA may be an indirect mechanism through which the virulence regulators Rns and CfaD limit the release of toxin.

Original languageEnglish (US)
Pages (from-to)1627-1632
Number of pages6
JournalJournal of bacteriology
Volume189
Issue number5
DOIs
StatePublished - Mar 2007

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

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