Two heme biosynthetic processes can be distinguished in vivo: one confined to immature erythroid cells that provides the large amount of heme needed for hemoglobin, and a ubiquitous one that provides the variable amounts of heme needed for cytochrome P450 enzymes (Riddle et al. 1989). The two processes differ most significantly at their first step, the condensation of succinyl CoA and glycine catalyzed by delta-aminolevulinate synthase, and its regulation.
Severance, S, Hamza, I
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