Also called gamma-glutamyltranspeptidase (ggt). Some members of this family have antibiotic synthesis or resistance activities. In the case of a cephalosporin acylase from Pseudomonas sp., the enzyme was shown to retain some gamma-glutamyltranspeptidase activity. Other, more distantly related proteins have ggt-related activities and score below the trusted cutoff. [Biosynthesis of cofactors, prosthetic groups, and carriers, Glutathione and analogs]