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Scheme of the (pseudo-)enzymatic properties of HSA-heme-Fe. Exa-coordinated HSA-Tyr161-heme-Fe(III)-His146 indicates the inactive heme-protein whereas pentacoordinated HSA-Tyr161-heme-Fe(III) indicates the active form. HSA-Tyr-161-heme-Fe(III)* is the active HSA-Tyr-161-heme-Fe(III); S is the substrate; HSA-Tyr-161-heme-Fe(III)-S is the HSA-Tyr-161-heme-Fe(III) substrate adduct, HSA-Tyr161--heme-Fe(III)*-S is the active HSA-Tyr161-heme-Fe(III) substrate adduct.
