Protoporphyrin IX biosynthesis pathway enzyme

The protoporphyrin IX biosynthesis pathway comprises a series of conserved enzymes that orchestrate the production of protoporphyrin IX from simpler precursors such as glycine and succinyl-CoA. This tetrapyrrole intermediate is the branching point for the synthesis of heme in animals and chlorophyll in plants, with iron or magnesium inserted by chelatases in the final steps. Key enzymes like protoporphyrinogen IX oxidase and ferrochelatase catalyze the conversion of protoporphyrinogen IX to protoporphyrin IX and then to heme, respectively. Disruption in this pathway leads to metabolic diseases like porphyrias and is harnessed therapeutically in photodynamic therapies for cancer. In plants, enzymes from this pathway have additional regulatory functions, such as RNA editing in plastids. Note: For structured annotations, provide data for specific enzymes in the pathway (e.g., "Protoporphyrinogen IX oxidase") rather than for the general pathway as a whole, as each enzyme can be annotated with its unique canonical name, abbreviation, and roles.

Other names

Protoporphyrinogen IX oxidase (PPOX, PPO)Coproporphyrinogen oxidase (CPO)Ferrochelatase (FECH)Tetrapyrrole biosynthetic enzymesHeme biosynthesis enzymes

Enzyme inhibition (blockage in pathway causes PPIX accumulation, leading to cytotoxicity); Enzyme activation (therapeutic modulation in anemia); Substrate provision (ALA and PPIX for photodynamic therapy; induces apoptosis upon light activation)