The requirement of RpoN (sigma factor sigma54) in denitrification by Pseudomonas stutzeri is indirect and restricted to the reduction of nitrite and nitric oxide.

Abstract excerpt

The rpoN region of Pseudomonas stutzeri was cloned, and an rpoN null mutant was constructed. RpoN was not essential for denitrification in this bacterium but affected the expression levels and enzymatic activities of cytochrome cd1 nitrite reductase and nitric oxide reductase, whereas those of respiratory nitrate reductase and nitrous oxide reductase were comparable to wild-type levels. Since the transcription of...

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