noun. Any of various enzymes that catalyze the transfer of a chemical group, such as a phosphate or amine, from one molecule to another.

noun. Any of various enzymes that catalyze the transfer of a functional group, such as amine or phosphate from one molecule to another.

noun. any of various enzymes that move a chemical group from one compound to another compound

"The reaction is catalyzed by Arg tRNA-protein transferase, a known protein with an hitherto unknown function."

enzyme  

aminopherase  aminotransferase  ribonuclease  ribonucleinase  rnase  

3-specific  angiotensin-converting  cell-wall  cholinesterase  conjugates