Protoporphyrin IX

Protoporphyrin IX, in the metabolism of porphyrin, is created by the enzyme protoporphyrinogen oxidase.

Heme b biosynthesis
In heme biosynthesis, the enzyme ferrochelatase converts it into heme b (i.e. Fe-protoporphyrin IX or protoheme IX).



Chlorophyll biosynthesis
In chlorophyll biosynthesis, the enzyme magnesium chelatase converts it into Mg-protoporphyrin IX.