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Mycobacterium tuberculosis, the causative agent of tuberculosis (TB), is an extraordinarily successful pathogen of humankind. It has been estimated that up to one-third of the world's population is infected with M. tuberculosis, and this population is an important reservoir for disease reactivation. Resuscitation promoting factor (Rpf) is a secretory protein, which was first reported in Micrococcus luteus. There are five functionally redundant Rpf-like proteins found in M. tuberculosis. Rpf promotes the resuscitation of dormant bacilli to yield normal, viable colony forming bacteria. All Rpfs share a conserved domain of about 70 amino acids and possess a lysozyme-like activity. The structural studies of the conserved domain suggest that Rpfs could be considered as a c-type lysozyme and lytic transglycosylases. Recently a novel class of nitrophenylthiocyanates (NPT) inhibitors of the muralytic activity of Rpf were reported which opens a new approach in the study of cell-wall hydrolyzing enzymes. This review describes molecular and structural studies conducted on Rpf proteins, their role in the resuscitation of dormant bacteria, in the reactivation of latent infection and identification of low molecular weight inhibitors of resuscitation promoting factors.

Resuscitation Promoting Factors: a Family of Microbial Proteins in Survival and Resuscitation of Dormant Mycobacteria