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Model for activation of the ysaE and sycB promoters. YsrS senses NaCl in the culture medium by an unknown mechanism and initiates a phosphorelay that leads to phosphorylation of YsrR. The activated YsrR then stimulates transcription of the ysaE promoter, either directly or indirectly. Once sufficient levels of YsaE and SycB have accumulated, they stimulate transcription of the sycB promoter.
