The Alternative Sigma Factor KatF (rpoS) Regulates Salmonella Virulence

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1992 Dec 15

PMID 1465428

Citations 236

Authors

F C Fang

S J Libby

N A Buchmeier

P C Loewen

J Switala

J Harwood

D G Guiney

Affiliations

Soon will be listed here.

Abstract

Nutrient limitation is a critical signal in Salmonella virulence gene regulation. The katF (rpoS) gene mediates the expression of the Salmonella spv plasmid virulence genes during bacterial starvation. A katF Salmonella mutant has increased susceptibility to nutrient deprivation, oxidative stress, acid stress, and DNA damage, conditions which are relevant to the intraphagosomal environment of host macrophages. Moreover, the katF mutant has significantly reduced virulence in mice. katF encodes an alternative sigma factor of RNA polymerase which coordinately regulates Salmonella virulence.

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