Probable methyltransferase TARBP1 (TARBP1)

Probable S-adenosyl-L-methionine-dependent methyltransferase which methylates RNA molecules such as tRNAs. In case of disease by HIV-1, it binds to the loop region of TAR RNA, a region also bound by RNA polymerase II.

Binding of TARBP1 and RNA polymerase II into HIV-1 TAR RNA is mutually exclusive, suggesting that TARBP1 may function alone or in conjunction with HIV-1 Tat to disengage RNA polymerase II from HIV-1 TAR RNA. May act by methylating HIV-1 TAR RNA.