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Information on EC 2.3.2.2 - gamma-glutamyltransferase

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EC Tree
     2 Transferases
         2.3 Acyltransferases
             2.3.2 Aminoacyltransferases
                2.3.2.2 gamma-glutamyltransferase
IUBMB Comments
The mammlian enzyme is part of the cell antioxidant defense mechanism. It initiates extracellular glutathione (GSH) breakdown, provides cells with a local cysteine supply and contributes to maintain intracelular GSH levels. The protein also has EC 3.4.19.13 (glutathione hydrolase) activity [3-4]. The enzyme consists of two chains that are created by the proteolytic cleavage of a single precursor polypeptide. The N-terminal L-threonine of the C-terminal subunit functions as the active site for both the cleavage and the hydrolysis reactions [3-4].
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Word Map
The expected taxonomic range for this enzyme is: Eukaryota, Bacteria, Archaea
Synonyms
ggt, gamma-glutamyl transpeptidase, gamma-glutamyltranspeptidase, gamma-gtp, gamma glutamyl transferase, glutamyl transpeptidase, gammagt, ggt-1, gamma-gtase, gamma-gpt, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
a (5-L-glutamyl)-peptide + an amino acid = a peptide + a 5-L-glutamyl amino acid
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