EC 1.3.5.3     
Accepted name: protoporphyrinogen IX dehydrogenase (quinone)
Reaction: protoporphyrinogen IX + 3 quinone = protoporphyrin IX + 3 quinol
Other name(s): HemG; protoporphyrinogen IX dehydrogenase (menaquinone)
Systematic name: protoporphyrinogen IX:quinone oxidoreductase
Comments: Contains FMN. The enzyme participates in heme b biosynthesis. In the bacterium Escherichia coli it interacts with either ubiquinone or menaquinone, depending on whether the organism grows aerobically or anaerobically.
References:
1.  Boynton, T.O., Daugherty, L.E., Dailey, T.A. and Dailey, H.A. Identification of Escherichia coli HemG as a novel, menadione-dependent flavodoxin with protoporphyrinogen oxidase activity. Biochemistry 48 (2009) 6705–6711. [PMID: 19583219]
2.  Möbius, K., Arias-Cartin, R., Breckau, D., Hännig, A.L., Riedmann, K., Biedendieck, R., Schroder, S., Becher, D., Magalon, A., Moser, J., Jahn, M. and Jahn, D. Heme biosynthesis is coupled to electron transport chains for energy generation. Proc. Natl. Acad. Sci. USA 107 (2010) 10436–10441. [PMID: 20484676]
[EC 1.3.5.3 created 2010, modified 2020]