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• W1989849170 abstract "The cyclic AMP receptor protein (CRP) family of transcription factors consists of global regulators of bacterial gene expression. Here, we identify two paralogous CRPs in the genome of Mycobacterium smegmatis that have 78% identical sequences and characterize them biochemically and functionally. The two proteins (MSMEG_0539 and MSMEG_6189) show differences in cAMP binding affinity, trypsin sensitivity, and binding to a CRP site that we have identified upstream of the msmeg_3781 gene. MSMEG_6189 binds to the CRP site readily in the absence of cAMP, while MSMEG_0539 binds in the presence of cAMP, albeit weakly. msmeg_6189 appears to be an essential gene, while the Δmsmeg_0539 strain was readily obtained. Using promoter–reporter constructs, we show that msmeg_3781 is regulated by CRP binding, and its transcription is repressed by MSMEG_6189. Our results are the first to characterize two paralogous and functional CRPs in a single bacterial genome. This gene duplication event has subsequently led to the evolution of two proteins whose biochemical differences translate to differential gene regulation, thus catering to the specific needs of the organism." @default.
• W1989849170 created "2016-06-24" @default.
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• W1989849170 date "2014-12-01" @default.
• W1989849170 modified "2023-09-27" @default.
• W1989849170 title "Paralogous cAMP Receptor Proteins in <i>Mycobacterium smegmatis</i> Show Biochemical and Functional Divergence" @default.
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• W1989849170 doi "https://doi.org/10.1021/bi500924v" @default.
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