Compound as reactive (1)
Mg2+ + H2O + protoporphyrin IX + ATP → 3 H+ + phosphate + ADP + Mg-protoporphyrin
Compound as product (1)
3 oxygen + protoporphyrinogen IX → 3 hydrogen peroxide + protoporphyrin IX
Reversible reaction (3)
Fe2+ + protoporphyrin IX ↔ 2 H+ + protoheme
3 oxygen + protoporphyrinogen IX ↔ 6 H2O + protoporphyrin IX
an oxidized electron donor + protoporphyrinogen IX ↔ a reduced electron donor + protoporphyrin IX