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Chromatin immunoprecipitation identified 191 binding sites of Mycobacterium tuberculosis cAMP receptor protein (CRP(Mt)) at endogenous expression levels using a specific α-CRP(Mt) antibody. Under these native conditions an equal distribution between intragenic and intergenic locations was observed. CRP(Mt) binding overlapped a palindromic consensus sequence. Analysis by RNA sequencing revealed widespread changes in transcriptional profile in a mutant strain lacking CRP(Mt) during exponential growth, and in response to nutrient starvation. Differential expression of genes with a CRP(Mt)-binding site represented only a minor portion of this transcriptional reprogramming with ∼ 19% of those representing transcriptional regulators potentially controlled by CRP(Mt). The subset of genes that are differentially expressed in the deletion mutant under both culture conditions conformed to a pattern resembling canonical CRP regulation in Escherichia coli, with binding close to the transcriptional start site associated with repression and upstream binding with activation. CRP(Mt) can function as a classical transcription factor in M. tuberculosis, though this occurs at only a subset of CRP(Mt)-binding sites.

nucleic acids research

Genomic mapping of cAMP receptor protein (CRPMt) inMycobacterium tuberculosis: relation to transcriptional start sites and the role of CRPMtas a transcription factor