Table 3.

Functioning of NarL and NarP in the control ofnrfA and nirB operon expression in response to nitrate and nitrite

Reporter fusion and methodActiona by the response regulatorSource or reference
NarLNarP
NitriteNitrateNitriteNitrate
nrfA
 Batch culture+++24
 Chemostat culture+, −+, −++This study
nirB
 Batch culture++None+ 24
 Chemostat culture++++This study
  • a +, activation of transcription by either the NarL or the NarP response regulatory protein; −, transcription repression.