The rcsA promoter of Pantoea stewartii subsp. stewartii features a low-level constitutive promoter and an EsaR quorum-sensing-regulated promoter.

@article{Carlier2006TheRP,
  title={The rcsA promoter of Pantoea stewartii subsp. stewartii features a low-level constitutive promoter and an EsaR quorum-sensing-regulated promoter.},
  author={Aurelien Carlier and Susanne Beck von Bodman},
  journal={Journal of bacteriology},
  year={2006},
  volume={188 12},
  pages={
          4581-4
        }
}
The upstream region of the Pantoea stewartii rcsA gene features two promoters, one for constitutive basal-level expression and a second autoregulated promoter for induced expression. The EsaR quorum-sensing repressor binds to a site centered between the two promoters, blocking transcription elongation from the regulated promoter under noninducing conditions. 
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