Rv0474 is a copper-responsive transcriptional regulator that negatively regulates expression of RNA polymerase β
Sajith Raghunandanan1, Ranjit Ramachandran1, Roshna Lawrence Gomez1
1Mycobacterium Research Laboratory, Tropical Disease Biology Division, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, India.
Abstract:
We characterize Rv0474, a putative transcriptional regulatory protein of Mycobacterium tuberculosis, which is found to function as a copper-responsive transcriptional regulator at toxic levels of copper. It is an autorepressor, but at elevated levels (10-250 μm) of copper ions the repression is relieved resulting in an increase in Rv0474 expression. Copper-bound Rv0474 is recruited to the rpoB promoter leading to its repression resulting in the growth arrest of the bacterium. Mutational analysis showed that the helix-turn-helix and leucine zipper domains of Rv0474 are essential for its binding to Rv0474 and rpoB promoters, respectively. The mechanism of Rv0474-mediated rpoB regulation seems to be operational only in pathogenic mycobacteria that can persist inside the host.
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