Abstracts » Biological sciences

Transcriptional regulation of the Escherichia coli rhaT gene

Article Abstract:

In response to L-rhamnose, rhaR induces rhaSR, and the accumulated rhaS directly induces rhaT expression in Escherichia coli. Thus, the regulatory cascade proposed for the rhaBAD stimulation is also applicable for the expression of the rhaT promoter. Deleted rhaT promoter fusions show the presence of two control elements in transcriptional regulation; one sensitive to cAMP-catabolite repression and the other sensitive to induction by L-rhamnose. RhaT expression is 2 and 3 times higher under anaerobic than aerobic conditions.

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The aldA gene of Escherichia coli is under the control of at least three transcriptional regulators

Article Abstract:

The control of expression of the aldA gene encoding aldehyde dehydrogenase was analyzed to characterize the three different regulatory functions in its promoter. It was found that the aldA gene of Escherichia coli is under the control of three transcriptional genes. One is controlled by the regulator-inducer complex, another by the catabilite repression protein (Crp)-cAMP complex, and the third by the Arcc anaerobic repressor.

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The gene yghK linked to the glc operon of Escherichia coli encodes a permease for glycolate that is structurally and functionally similar to L-lactate permease

Article Abstract:

Results demonstrate that Escherichia coli yghK gene product is a permease involved in the glycolate uptake and resemble L-lactate permease in terms of its structure and function. Data further indicate that 2-hydroxymonocarboxylates serve as specific substrates for both the proteins.

Spain, Statistical Data Included, Analysis, Physiological aspects, Enzymes, Gene expression, Enzyme structure-activity relationships

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