PIPMT, or Trimethylguanosine synthase 1, is a human gene encoded by TGS1. It may also be known as: Trimethylguanosine synthase; Cap-specific guanine-N2 methyltransferase; Hepatocellular carcinoma-associated antigen 137; Nuclear receptor coactivator 6-interacting protein; PRIP-interacting protein with methyltransferase motif; CLL-associated antigen KW-2; Trimethylguanosine synthase ; NCOA6IP. The encoded protein is an enzyme with an amino acid length of 853 and a mass of 96.6 kDa. PIPMT is a member of the Methyltransferase superfamily, Trimethylguanosine synthase family. Homologs of this gene exist in other organisms, including: Mouse, Rat.