MnoSR Is a Bona Fide Two-Component System Involved in Methylotrophic Metabolism in Mycobacterium smegmatis

Methylotrophic metabolism has gained huge attention considering its broad application in ecology, agriculture, industries, and human health. The genusMycobacterium comprises both pathogenic and nonpathogenic species. Several members of this genus are known to utilize methanol as the sole carbon source for growth. Although various pathways underlying methanol utilization have been established, the regulation of methylotrophic metabolism is not well studied. In the present work, we explore the regulation of methanol metabolism inM. smegmatis and discover a dedicated two-component system (TCS), MnoSR, that is involved in its regulation. We show that the loss of MnoSR renders the bacterium incapable of utilizing methanol and 1,3-propanediol as the sole carbon sources. Additionally, we establish that MnoS acts as the common sensor for the alcohols inM. smegmatis .