3.4.24.B6	Ca2+	dependent on	652736, 686743	
3.4.24.B6	Ca2+	required	712555, 712586, 712590	
3.4.24.B6	additional information	neither calcium nor magnesium alone can effectively activate the proenzyme	684397	
3.4.24.B6	Zn2+	-	684767	
3.4.24.B6	Zn2+	1 mM, activates effectively	684397	
3.4.24.B6	Zn2+	dependent on	651269, 652736, 686743	
3.4.24.B6	Zn2+	enzyme contains a zinc-binding site in the catalytic domain with the consensus sequence HEXGHXXGXXH at positions 226-236	649826	
3.4.24.B6	Zn2+	part of the catalytic subdomain	686936