6.3.1.17	ADP + phosphate + beta-citryl-L-glutamate	isoform GCP3 acts preferentially on beta-citryl-L-glutamate in the presence of Ca2+. Its activity on this substrate is lower in the presence of Mn2+ and completely cancelled in the presence of Zn2+	
6.3.1.17	ADP + phosphate + N-acetyl-aspartylglutamate	in the presence of Ca2+, the purified enzyme specifically hydrolyzes beta-citrylglutamate and does not act on N-acetyl-aspartylglutamate. However, both compounds were hydrolyzed in the presence of Mn2+	
6.3.1.17	ATP + citrate + L-glutamate	-