Enzymes (EC class 2) transferring: one-carbon groups (2.1, including methyltransferases, 2.1.1; formyltransferases, 2.1.2; carboxyl- and carbamoyltransferases, 2.1.3; and amidinotransferases, 2.1.4); acyl residues (acyltransferases, 2.3); glycosyl residues (glycosyltransferases, 2.4, including hexosyltransferases, 2.4.1, and pentosyltransferases, 2.4.2); alkyl or aryl groups (2.5); nitrogenous groups (2.6); phosphorus-containing groups (2.7, phosphotransferases); and sulfur-containing groups (2.8, including sulfurtransferases, 2.8.1; sulfotransferases, 2.8.2; and CoA-t., 2.8.3). SYN: transferring enzymes.
- terminal t. enzymes that covalently add nucleotides to the 3′ end of polynucleic acids; E.G., DNA nucleotidylexotransferase.
- terminal deoxynucleotidyl transferase (TdT) a specialized DNA polymerase expressed in immature, pre-B, pre-T lymphoid cells, and acute lymphoblastic leukemia/lymphoma cells.
Medical dictionary. 2011.