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. 1987 Dec;84(23):8315-9.
doi: 10.1073/pnas.84.23.8315.

Mutants of the catabolite activator protein of Escherichia coli that are specifically deficient in the gene-activation function

N Irwin  1 , M Ptashne
Affiliations

Mutants of the catabolite activator protein of Escherichia coli that are specifically deficient in the gene-activation function

N Irwin et al. Proc Natl Acad Sci U S A. 1987 Dec.

Abstract

In the presence of cyclic AMP, the catabolite activator protein (CAP) of Escherichia coli binds DNA and stimulates transcription at a number of promoters. We have examined a model of CAP bound at the gal promoter and, using directed mutagenesis, have isolated CAP mutants that are analogous to the lambda repressor positive control (pc) mutants. These CAP mutants bind DNA but are defective in stimulating transcription at the gal P1 promoter. These mutants are also altered in positive control at the lac and malT promoters, where CAP binds to sites further upstream from the transcription start site.

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