Transfers mannose from GDP-mannose to lipid acceptors to form polyprenol monophosphomannose (PPM); catalytic activity in vitro is enhanced by Lnt (AC A0QZ13) (PubMed:12427759). PMM is an alkai-stable sugar donor which adds mannose-phosphate residues to triacylated-PIM2, eventually leading to generation of the cell wall glycolipid lipoglycan modulins lipoarabinomannan (LAM) and lipomannan (LM) (By similarity). a dolichyl phosphate + GDP-alpha-D-mannose = a dolichyl beta-D-mannosyl phosphate + GDP Interacts with Lnt (also called Ppm2, AC A0QZ13) upon coexpression in E.coli, which increases the PPM synthase activity of this protein. Essential it cannot be deleted. In depletion experiments increasing amounts of phosphatidyl-myo-inositol (PI) and decreasing amounts of acylated PI mannosides (AcPIM), as well as decreased synthesis of lipomannan (LM) but not lipoarabinomannan (LAM) are observed. In a number of other Mycobacteria, including M.bovis and M.tuberculosis, this protein is the first domain in a 2 domain protein. Belongs to the glycosyltransferase 2 family.