1887

Abstract

The expression of the genes involved in the degradation of the aromatic compound 3-(3-hydroxyphenyl)propionic acid (3HPP) in is dependent on the MhpR transcriptional activator at the promoter. This catabolic promoter is also subject to catabolic repression in the presence of glucose mediated by the cAMP–CRP complex. The promoter drives the MhpR-independent expression of the regulatory gene. and experiments have shown that transcription from the promoter is downregulated by the addition of glucose and this catabolic repression is also mediated by the cAMP–CRP complex. The activation role of the cAMP–CRP regulatory system was further investigated by DNase I footprinting assays, which showed that the cAMP–CRP complex binds to the promoter sequence, protecting a region centred at position −40.5, which allowed the classification of as a class II CRP-dependent promoter. Open complex formation at the promoter is observed only when RNA polymerase and cAMP–CRP are present. Finally, by transcription assays we have demonstrated the absolute requirement of the cAMP–CRP complex for the activation of the promoter.

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2011-02-01
2019-10-19
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