Aerobic and anaerobic Mg-protoporphyrin monomethyl ester cyclases in purple bacteria: a strategy adopted to bypass the repressive oxygen control system.

Abstract excerpt

Two different mechanisms for Mg-protoporphyrin monomethyl ester (MgPMe) cyclization are shown to coexist in Rubrivivax gelatinosus and are proposed to be conserved in all facultative aerobic phototrophs: an anaerobic mechanism active under photosynthesis or low oxygenation, and an aerobic mechanism active only under high oxygenation conditions. This was confirmed by analyzing the bacteriochlorophyll accumulation...

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