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Identification of a promoter motif regulating the major DNA damage response mechanism of Mycobacterium tuberculosis.

Research paper by Vera V Gamulin, Helena H Cetkovic, Ivan I Ahel

Indexed on: 01 Sep '04Published on: 01 Sep '04Published in: FEMS Microbiology Letters



Abstract

The principal response of many bacteria to DNA damage is mediated by a mechanism dependent on the LexA and RecA proteins. However, Mycobacterium tuberculosis was recently reported to regulate a majority of DNA repair genes independently of RecA and LexA, suggesting that an unknown RecA/LexA-independent mechanism controls the major DNA damage response pathway in this organism. Here we have identified a motif tTGTCRgtg-8nt-TAnnnT that defines a novel RecA/LexA-independent promoter (RecA-NDp) of M. tuberculosis. Furthermore, we show that the RecA-NDp type of promoter precedes DNA repair genes in other Actinomycetales.