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J. Bacteriol., 08 1997, 5232-5237, Vol 179, No. 16
Copyright © 1997, American Society for Microbiology

Autogenous control of PspF, a constitutively active enhancer-binding protein of Escherichia coli

G Jovanovic, J Dworkin and P Model
Laboratory of Genetics, The Rockefeller University, New York, New York 10021, USA.

Escherichia coli sigma54-dependent phage shock protein operon (pspA to - E) transcription is under the control of PspF, a constitutively active activator. Sigma70-dependent transcription of pspF is under autogenous control by wild-type PspF but not by a DNA-binding mutant, PspF deltaHTH. Negative autoregulation of PspF is continual and not affected by stimuli, like f1 pIV, that induce the pspA to -E operon. PspF production is independent of PspA (the negative regulator of the pspA to -E operon) and of PspB and -C (positive regulators).


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