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FEMS Microbiol Lett. 2013 Aug;345(2):132-40. doi: 10.1111/1574-6968.12196. Epub 2013 Jul 8.

bkaR is a TetR-type repressor that controls an operon associated with branched-chain keto-acid metabolism in Mycobacteria.

Author information

1
Department of Pathology and Pathogen Biology, The Royal Veterinary College, Camden, London, UK.

Abstract

This study describes how bkaR, a highly conserved mycobacterial TetR-like transcriptional repressor, regulates a number of nearby genes that have associations with branched-chain keto-acid metabolism. bkaR (MSMEG_4718) was deleted from the nonpathogenic species Mycobacterium smegmatis, and changes in global gene expression were assessed using microarray analysis and reporter gene studies. bkaR was found to directly control the expression of 10 genes in M. smegmatis, and its ortholog in Mycobacterium tuberculosis (Rv2506) is predicted to control at least 12 genes. A conserved operator motif was identified, and binding of purified recombinant M. tuberculosis BkaR to the motif was demonstrated. Analysis of the stoichiometry of binding showed that BkaR binds to the motif as a dimer.

KEYWORDS:

MSMEG_4718; Rv2506; accA1; accD1; microarray; transcriptional regulation

PMID:
23763300
PMCID:
PMC3920632
DOI:
10.1111/1574-6968.12196
[Indexed for MEDLINE]
Free PMC Article
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