Involved in preservation of envelope integrity and tolerance to surface stress (PubMed:25899163). Reverses the inhibitory effect of PspA on ClgR activity (PubMed:25899163). Facilitates intracellular growth of M.tuberculosis (PubMed:25899163). Interacts with Rv2743c. Expression is regulated by ClgR. The Rv2743c-Rv2742c double mutation reduces intracellular ATP levels under surface-stress conditions to less than 60% of wild-type levels.