Characterization of two novel regulatory genes affecting Salmonella invasion gene expression

• Published in: Molecular microbiology Vol. 35; no. 3; pp. 635 - 646
• Main Authors: Altier, Craig, Suyemoto, Mitsu, Ruiz, Angela I., Burnham, Kara D., Maurer, Russell
• Format: Journal Article
• Language: English
• Published: Oxford BSL Blackwell Science Ltd 01.02.2000; Blackwell Publishing Ltd
• Subjects: airS gene; Bacterial Proteins - genetics; Bacterial Proteins - metabolism; BarA protein; Base Sequence; Carcinoma, Hepatocellular - microbiology; Chromosome Deletion; csrB gene; Escherichia coli Proteins; Gene Expression Regulation, Bacterial; Genes, Regulator; HilA protein; Humans; lacY gene; lacZ gene; Membrane Proteins - genetics; Membrane Proteins - metabolism; Molecular Sequence Data; Mutation; Phosphotransferases; Repressor Proteins; RNA, Bacterial - metabolism; RNA, Long Noncoding; RNA, Untranslated; RNA-Binding Proteins - genetics; RNA-Binding Proteins - metabolism; Salmonella typhimurium; Salmonella typhimurium - genetics; Salmonella typhimurium - pathogenicity; SirA protein; Suppression, Genetic; Trans-Activators - genetics; Trans-Activators - metabolism; Tumor Cells, Cultured
• ISSN: 0950-382X; 1365-2958
• DOI: 10.1046/j.1365-2958.2000.01734.x

A Salmonella typhimurium chromosomal deletion removing ≈19 kb of DNA at centisome 65 reduces invasion of cultured epithelial cells as well as the expression of lacZY operon fusions to several genes required for the invasive phenotype. As the deleted region contains no genes previously known to affect Salmonella invasion, we investigated the roles of individual genes in the deleted region using a combination of cloning, complementation and directed mutation. We find that the deletion includes two unrelated regulatory genes. One is the Salmonella homologue of Escherichia coli barA (airS ), which encodes a member of the multistep phosphorelay subgroup of two‐component sensor kinases. The action of BarA is coupled to that of SirA, a member of the phosphorylated response regulator family of proteins, and includes both HilA‐dependent and HilA‐independent components. The other regulatory gene removed by the deletion is the Salmonella homologue of E. coli csrB, which specifies a regulatory RNA implicated in controlling specific message turnover in E. coli. These results identify a protein that is likely to play a key role in the environmental control of Salmonella invasion gene expression, and they also suggest that transcriptional control of invasion genes could be subject to refinement at the level of message turnover.