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© Research
Publication : FEMS microbiology letters

The putative sigma factor KatF (RpoS) is required for the transcription of the Salmonella typhimurium virulence gene spvB in Escherichia coli

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in FEMS microbiology letters - 01 Dec 1992

Norel F, Robbe-Saule V, Popoff MY, Coynault C

Link to Pubmed [PMID] – 1490610

FEMS Microbiol. Lett. 1992 Dec;78(2-3):271-6

The virulence of Salmonella typhimurium for mice is dependent on a plasmid-borne gene cluster termed spv. We previously determined that both S. typhimurium and Escherichia coli bacteria grown in a rich medium preferentially express the spv genes during the stationary phase of growth. In this study we evaluated the role of KatF, a putative sigma factor for starvation- and stationary phase-induced genes, in the expression of the spvB gene. The transcription of spvB in E. coli was compared in katF and wild-type backgrounds, using cloned spvB-lacZ and spvB-cat fusions. Expression of spvB was found to be greatly affected in katF mutants. Complementation experiments performed with the cloned katF gene confirmed that KatF is required for the expression of the S. typhimurium virulence gene spvB in E. coli.

http://www.ncbi.nlm.nih.gov/pubmed/1490610