NDLI: Evolution of the Mycobacterial SigK Regulon▿

Content Provider	PubMed Central
Author	Veyrier, Frédéric Saïd-salim, Battouli Behr, Marcel A.
Abstract	Previous studies have established that members of the Mycobacterium tuberculosis complex exhibit variable production of the antigenic proteins MPT70 and MPT83 due to mutations in their positive regulator, SigK (sigma factor K), and their negative regulator, RskA (regulator of sigma K). To further understand this highly specific SigK-controlled regulon, we have undertaken evolutionary studies to determine the presence of homologues of SigK-regulated genes in other organisms and to predict its transcriptional network. Evolutionary analysis indicates that the positive and negative regulators are conserved across many organisms, but that the genes under their control are variable. Moreover, the addition, loss, and movement of various genes in the mpt70/83 locus suggest that these genes are unlikely to be cotranscribed. To test predictions from sequence analysis, we have used promoter luciferase fusions and Northern blots to show that the majority of genes in this locus have their own promoters, of which a subset are SigK regulated (mpt83, dipZ, mpt70, and Rv0449c). Next, we have shown that the intracellular inducibility of mpt70 and mpt83 is a conserved property, shared between M. tuberculosis and Mycobacterium marinum. In addition, we have shown that SigK and RskA from an environmental mycobacterium isolate (M. gilvum PYR-GCK) complemented the regulatory activity of M. tuberculosis ΔsigK rskA. Together, our data indicate that the regulatory system SigK/RskA is conserved across the Mycobacterium genus, whereas the regulon under its control varies considerably across species.
Related Links	http://dx.doi.org/10.1128/JB.01452-07
Starting Page	1891
File Format	PDF
ISSN	10985530
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	6
Volume Number	190
Language	English
Publisher	American Society for Microbiology (ASM)
Publisher Date	2008-03-01
Access Restriction	Open
Rights Holder	American Society for Microbiology (ASM)
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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