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Insulation of the ^F Regulatory System in Bacillus subtilis

Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 01238,¹ Department of Food Science and Technology, University of California, Davis, California 95616²

Received 30 January 2004/ Accepted 24 March 2004

The transcription factors ^F and ^B are related RNA polymerase sigma factors that govern dissimilar networks of adaptation to stress conditions in Bacillus subtilis. The two factors are controlled by closely related regulatory pathways, involving protein kinases and phosphatases. We report that insulation of the ^F pathway from the ^B pathway involves the integrated action of both the cognate kinase and the cognate phosphatase.

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