PMID: 5274454Nov 1, 1970

The gamma-glutamyl cycle: a possible transport system for amino acids

Proceedings of the National Academy of Sciences of the United States of America
M Orlowski, A Meister


Evidence is presented that rat kidney contains enzymes that catalyze the synthesis and utilization of glutathione; these reactions, which involve the uptake and release of amino acids from gamma-glutamyl linkage, constitute a cyclical process which is termed "the gamma-glutamyl cycle." The gamma-glutamyl cycle has properties that fulfill the requirements of an amino acid transport system. Thus, gamma-glutamyl transpeptidase may function in translocation and gamma-glutamylcysteine synthetase and glutathione synthetase may catalyze energy-requiring "recovery" steps in transport. These and other considerations suggest that glutathione serves a carrier function in amino acid transport.


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Related Concepts

Enzymes, antithrombotic
Amino Acids, I.V. solution additive
Gamma-glutamyl transferase
Glutamate-Cysteine Ligase
Glutathione Measurement
Enzymes for Treatment of Wounds and Ulcers

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