3.4.21.47	Mg2+	required	732705	
3.4.21.47	Mg2+	required for activity	754745	
3.4.21.47	Mg2+	the C5 convertase is a serine protease that consists of two subunits: a catalytic subunit which is bound in a Mg2+-dependent complex to a noncatalytic subunit	652672	
3.4.21.47	Ni2+	promotes a stable C3bB complex	701017