4.2.1.114	Fe2+	the enzyme contains an iron-sulfur center, reconstitution of the purified recombinant apoenzyme with iron-sulfur, overview	
4.2.1.114	Fe2+	required, in a Fe-S cluster	
4.2.1.114	Iron-sulfur cluster	the structure of the protein has unbound Fe-S clusters and contains a fourth cysteine in the active site	
4.2.1.114	Mg2+	required for the hydratase reaction, not for the hydrolase reaction