Definition: An enzyme, sometimes called GGT, with a key role in the synthesis and degradation of GLUTATHIONE; (GSH, a tripeptide that protects cells from many toxins). It catalyzes the transfer of the gamma-glutamyl moiety to an acceptor amino acid.
do not confuse with PROTEIN-GLUTAMINE GAMMA-GLUTAMYLTRANSFERASES or GLUTAMINYL-PEPTIDE GAMMA-GLUTAMYLTRANSFERASES see TRANSGLUTAMINASES which crosslinks proteins nor with GAMMA-GLUTAMYLCYCLOTRANSFERASE
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