Role of intragenic binding of cAMP responsive protein (CRP) in regulation of the succinate dehydrogenase genes Rv0249c-Rv0247c in TB complex mycobacteria.
Bacterial pathogens adapt to changing environments within their hosts, and the signaling molecule adenosine 3', 5'-cyclic monophosphate (cAMP) facilitates this process. In this study, we characterized in vivo DNA binding and gene regulation by the cAMP-responsive protein CRP in M. bovis BCG as a model for tuberculosis (TB)-complex bacteria. Chromatin immunoprecipitation followed by deep-sequencing (ChIP-seq) showed that CRP associates with ∼900 DNA binding regions, most of which occur within genes. The most highly enriched binding region was upstream of a putative copper transporter gene (ctpB), and crp-deleted bacteria showed increased sensitivity to copper toxicity. Detailed mutational analysis of four CRP binding sites upstream of the virulence-associated Rv0249c-Rv0247c succinate dehydrogenase genes demonstrated that CRP directly regulates Rv0249c-Rv0247c expression from two promoters, one of which requires sequences intragenic to Rv0250c for maximum expression. The high percentage of intragenic CRP binding sites and our demonstration that these intragenic DNA sequences significantly contribute to biologically relevant gene expression greatly expand the genome space that must be considered for gene regulatory analyses in mycobacteria. These findings also have practical implications for an important bacterial pathogen in which identification of mutations that affect expression of drug target-related genes is widely used for rapid drug resistance screening.
Wadsworth Center, New York State Department of Health, 120 New Scotland Avenue, PO Box 22002, Albany, NY 12201-2002, USA.
Gwendowlyn S
GS
Knapp
Bioinformatics Program, Boston University, Boston, MA 02215, USA.
Anna
A
Lyubetskaya
Department of Biomedical Engineering, Boston, MA 02215, USA.
Matthew W
MW
Peterson
Bioinformatics Program, Boston University, Boston, MA 02215, USA.
Antonio L C
AL
Gomes
Wadsworth Center, New York State Department of Health, 120 New Scotland Avenue, PO Box 22002, Albany, NY 12201-2002, USA.
Zhuo
Z
Ma
Bioinformatics Program, Boston University, Boston, MA 02215, USA Department of Biomedical Engineering, Boston, MA 02215, USA Department of Microbiology, Boston University, Boston, MA 02215, USA jgalag@bu.edu.
James E
JE
Galagan
Wadsworth Center, New York State Department of Health, 120 New Scotland Avenue, PO Box 22002, Albany, NY 12201-2002, USA Department of Biomedical Sciences, University at Albany, SUNY, Albany, NY 12201, USA Kathleen.McDonough@health.ny.gov.
Kathleen A
KA
McDonough
D001426:Bacterial Proteins / Q000378:metabolism*; D001665:Binding Sites; D002373:Cyclic AMP Receptor Protein / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D016680:Genome, Bacterial; D009163:Mycobacterium bovis / Q000235:genetics*; D011401:Promoter Regions, Genetic; D018085:Regulon; D013385:Succinate Dehydrogenase / Q000235:genetics*
D001426:Bacterial Proteins; D002373:Cyclic AMP Receptor Protein; D013385:Succinate Dehydrogenase