Carbohydrate uptake genes inEscherichia coli are induced by carbon starvation |
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Authors: | Denise M. Alexander Keith Damerau Dr. Ann C. St. John |
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Affiliation: | (1) Department of Biological Sciences, Nelson Biology Laboratories, Rutgers, the State University of New Jersey, 08855-1059 Piscataway, New Jersey, USA |
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Abstract: | Escherichia coli produces several membrane-associated and periplasmic proteins in response to deprivation for a carbon source. The carbon starvation response involves a two- to fourfold, cAMP-dependent induction of operons involved in carbohydrate uptake and utilization, including thelac operon. Threecarbon-starvation-inducible (sci) gene fusions to aphoA reporter sequence were characterized. ThephoA-fusions werecya+/crp+-dependent and located in three previously characterized genes involved in high-affinity uptake of alternative carbon sources:mglB, encoding the periplasmic galactose binding protein;rbsB, encoding the periplasmic ribose binding protein; andlamB, encoding the maltodextrin-specific outer membrane porin. |
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