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TheccoNOQP gene cluster ofRhodobacter sphaeroides 2.4.1T encodes acbb 3 cytochrome oxidase which is utilized in oxygen-limited conditions for aerobic respiration. The β-galactosidase activity of accoN ::lacZ transcriptional fusion was low under high (30%)-oxygen and anaerobic growth conditions. MaximalccoN ::lacZ expression was observed when the oxygen concentration was lowered to 2%. In an FnrL mutant,ccoN ::lacZ expression was significantly lower than in the wild-type strain, suggesting that FnrL is a positive regulator of genes encoding thecbb 3 oxidase.

journal of bacteriology

Oxygen Regulation of the ccoN Gene Encoding a Component of the cbb 3 Oxidase in Rhodobacter sphaeroides 2.4.1 T : Involvement of the FnrL Protein