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ProP is an integral membrane transporter of proline, glycine betaine, and several other osmoprotecting compounds. Fis plus RpoS collaborate to promote a burst of proP transcription in late exponential growth phase. This brief period of ProP synthesis enables stationary phase cells to cope with a potential hyperosmotic shock. Fis activates the RpoS (σ 38 )-dependent proP P2 promoter by...
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