A member of the dormancy regulon. Induced in response to reduced oxygen tension (hypoxia), low levels of nitric oxide (NO) and carbon monoxide (CO). It is hoped that this regulon will give insight into the latent, or dormant phase of infection. Member of the Rv3134c-devR-devS operon. A strain lacking this gene does not induce most genes of the dormancy regulon, due to polar effects on the downstream devR (dosR) gene (PubMed:11416222). Restoration of induction only occurs when both this gene and devR (dosR) are transformed into the deleted strain. Belongs to the universal stress protein A family.