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An enzyme that catalyzes the transfer of a γ-glutamyl group from a γ-glutamyl peptide (usually glutathione) to another peptide, certain amino acids, or water; a deficiency of this enzyme will result in glutathionuria.

gamma-glutamyltransferase (GGT)

an enzyme that appears in the serum of patients with several types of liver or gallbladder disorders, including drug hepatotoxicity, biliary tract obstruction, alcohol-induced liver disease, and liver carcinoma. Normal adult (after 45 years of age) GGT blood levels are 8 to 38 U/L.
References in periodicals archive ?
Hepatic alkaline phosphatase and g-glutamyltransferase activities were significantly reduced in animals fed with SP + E diet and glucose-6-phosphatase activity was significantly enhanced.
d) IDL, intermediate-density lipoprotein; ALT, alanine aminotransferase; ALP, alkaline phosphatase; GGT, g-glutamyltransferase.