Protoporphyrinogen IX dehydrogenase (menaquinone)

Protoporphyrinogen IX dehydrogenase (menaquinone) (, HemG) is an enzyme with systematic name protoporphyrinogen IX:menaquinone oxidoreductase. This enzyme catalyses the following chemical reaction


 * protoporphyrinogen IX + 3 menaquinone $$\rightleftharpoons$$ protoporphyrin IX + 3 menaquinol

This enzyme enables Escherichia coli to synthesize heme in both aerobic and anaerobic environments.