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hemC | Hydroxymethylbilane synthase; Tetrapolymerization of the monopyrrole PBG into the hydroxymethylbilane pre-uroporphyrinogen in several discrete steps. (313 aa) | ||||
cyaY | Iron-dependent inhibitor of iron-sulfur cluster formation; Involved in iron-sulfur (Fe-S) cluster assembly. May act as a regulator of Fe-S biogenesis. Can bind both Fe(2+) and Fe(3+) ions. In vivo, has a positive effect on Fe-S cluster biogenesis under iron- rich growth conditions. In vitro, can inhibit IscS cysteine desulfurase activity and the formation of Fe-S clusters on IscU. In vitro, in the presence of IscS and cysteine, Fe(3+)-CyaY can be used as an iron donor during Fe-S cluster assembly on the scaffold protein IscU. (106 aa) | ||||
hemD | Uroporphyrinogen III synthase; Catalyzes cyclization of the linear tetrapyrrole, hydroxymethylbilane, to the macrocyclic uroporphyrinogen III. Belongs to the uroporphyrinogen-III synthase family. (246 aa) | ||||
hemH | Ferrochelatase; Catalyzes the ferrous insertion into protoporphyrin IX; Belongs to the ferrochelatase family. (320 aa) |