Reaction catalyzed by gamma-glutamyltransferase (2.3.2.2)
+
=
+
5-L-glutamyl-4-nitroanilide
+
5-L-glutamyl-4-nitroanilide
=
5-L-glutamyl-5-L-glutamyl-4-nitroanilide
+
4-nitroaniline