dolichyl-phosphate-mannose--protein mannosyltransferase 1,LGMD2K,LGMDR11,MDDGA1,MDDGB1,MDDGC1,protein O-mannosyl-transferase 1,RT,testis tissue sperm-binding protein Li 57p,truncated O-mannosyl-transferase 1 variant SV3DEL.
Transfers mannosyl residues to the hydroxyl group of serine or threonine residues. Coexpression of both POMT1 and POMT2 is necessary for enzyme activity, expression of either POMT1 or POMT2 alone is insufficient.