Lipidation of an FlrC-dependent protein is required for enhanced intestinal colonization by Vibrio cholerae.

Abstract:

:Vibrio cholerae, the causative agent of cholera, has a sheathed, polar flagellum, and motility has been linked to virulence. An operon with two genes, flgO and flgP (VC2207 and VC2206), is positively regulated by FlrC, the activator of class III flagellar genes. Deletion of flgP results in a nonmotile phenotype, demonstrating the requirement of this gene for V. cholerae motility. V. cholerae delta flgP cells synthesize fragile and defective flagella but transcribe flagellar genes similar to the wild-type strain. PhoA fusion analysis indicated that the putative lipoprotein FlgP is localized external to the cytoplasm, and fractionation demonstrated that it was localized to the outer membrane. Mutagenesis of the site of lipidation of FlgP (C18G) prevented [3H]palmitate incorporation and outer membrane localization. Interestingly, FlgP with the mutation C18G [FlgP(C18G)] could complement the delta flgP mutant for motility, and the cells synthesized wild-type flagella. The delta flgP mutant strain was defective for intestinal colonization (approximately 20-fold), but FlgP(C18G) was unable to complement this defect, demonstrating that lipidation of FlgP is essential for its role in intestinal colonization but not flagellar synthesis. FlgP thus represents a novel V. cholerae intestinal colonization factor that is regulated by the flagellar transcription hierarchy.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Morris DC,Peng F,Barker JR,Klose KE

doi

10.1128/JB.00924-07

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

231-9

issue

1

eissn

0021-9193

issn

1098-5530

pii

JB.00924-07

journal_volume

190

pub_type

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