May play a critical role in the homeostasis of triacylglycerol-containing lipid droplets in M.tuberculosis and influence the entry of the pathogen into a dormant state. Up-regulated in tuberculosis dormancy. Disruption mutant shows a significant decrease in the biosynthesis and accumulation of lipid droplets containing triacylglycerol and in its tolerance to rifampicin. Belongs to the mycobacterial PPE family.