Reaction catalyzed by gamma-glutamyltransferase (2.3.2.2)

		+			=			+
	5-L-glutamyl-4-nitroanilide	+		1-amino-cyclopropane-1-carboxylic acid	=		4-nitroaniline	+		5-L-glutamyl-1-amino-cyclopropane-1-carboxylic acid