Glutamyl transpeptidase transferase EC

7-glutamyl-peptide -I- X peptide -l- y-glutamyl- X, where X is an amino acid. 

which has been isolated from the fat globule membrane, has a molecular mass of about 80 kDa and consists of two subunits of 57 and 26 kDa. It is optimally active at pH 8-9, has a pi of 3.85 and is inhibited by iodoacetate, diisopropylfluorophosphate and metal ions, e.g. Cu and Fe  

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