Membrane-Bound γ-Glutamyl Transpeptidase

  • Alton Meister
  • Suresh S. Tate
  • Leonard L. Ross


γ-Glutamyl transpeptidase is a membrane-bound enzyme that catalyzes the transfer of the γ-glutamyl moiety of glutathione (and of other γ-glutamyl compounds) to amino acid (and peptide) acceptors as indicated in reaction (1):
$$ glutathione + a\min o\,acid \to \gamma - glutamyl\,a\min o\,acid + cysteinyl\,glycine $$
This reaction is the first step in a quantitatively significant pathway of glutathione metabolism, and it has been postulated that this or analogous reactions are involved in amino acid transport. Thus, γ-glutamyl transpeptidase mediates the translocation of the amino acid across the cell membrane by interacting with both extracellular amino acid and intracellular glutathione (or other compounds that contain the γ-glutamyl carrier); according to this idea, the amino acid enters the cell as a γ-glutamyl amino acid.


Amino Acid Transport Anterior Horn Cell Mercapturic Acid Glutathione Synthetase Cysteinyl Glycine 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1976

Authors and Affiliations

  • Alton Meister
    • 1
  • Suresh S. Tate
    • 1
  • Leonard L. Ross
    • 2
  1. 1.Department of BiochemistryCornell University Medical CollegeNew YorkUSA
  2. 2.Department of AnatomyThe Medical College of PennsylvaniaPhiladelphiaUSA

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