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Four potential binding sites for LexA were identified upstream of the Mycobacterium tuberculosis lexA gene. A mutational analysis of these sites in a lexA-lacZ reporter construct revealed that only one of these SOS boxes was required for DNA-damage-mediated regulation of lexA expression. A novel DNA-damage-inducible gene, Rv2719c, was identified that was divergently transcribed relative to lexA; the other three SOS boxes were found to be involved in regulating expression of this novel mycobacterial-specific gene. The SOS boxes lay in the respective promoter regions of the genes that they regulated.

The role of multiple SOS boxes upstream of the Mycobacterium tuberculosis lexA gene – identification of a novel DNA-damage-inducible gene