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About: Chelatase     Goto   Sponge   NotDistinct   Permalink

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In biochemistry, chelatases are enzymes that catalyze the insertion ("metalation") of naturally occurring tetrapyrroles. Many tetrapyrrole-based cofactors exist in nature including hemes, chlorophylls, and vitamin B12. These metallo cofactors are derived by the reaction of metal cations with tetrapyrroles, which are not ligands per se, but the conjugate acids thereof. In the case of ferrochelatases, the reaction that chelatases catalyze is: Fe2+ + H2P → FeP + 2 H+ In the above equation H2P represents a sirohydrochlorin or a porphyrin, such as protoporphyrin IX.