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• W2160996033 abstract "In Gram-positive bacteria, catabolite control protein A (CcpA)-mediated catabolite repression or activation regulates not only the expression of a great number of catabolic operons, but also the synthesis of enzymes of central metabolic pathways. We found that a constituent of the Bacillus subtilis respiratory chain, the small cytochrome c550 encoded by the cccA gene, was also submitted to catabolite repression. Similar to most catabolite-repressed genes and operons, the Bacillus subtilis cccA gene contains a potential catabolite response element cre, an operator site recognized by CcpA. The presumed cre overlaps the -35 region of the cccA promoter. Strains carrying a cccA'-IacZ fusion formed blue colonies when grown on rich solid medium, whereas white colonies were obtained when glucose was present. beta-Galactosidase assays with cells grown in rich medium confirmed the repressive effect of glucose on cccA'-lacZ expression. Introduction of a ccpA or hprK mutation or of a mutation affecting the presumed cccA cre relieved the repressive effect of glucose during late log phase. An additional glucose repression mechanism was activated during stationary phase, which was not relieved by the ccpA, hprK or cre mutations. An interaction of the repressor/corepressor complex (CcpA/seryl-phosphorylated HPr (P-Ser-HPr)) with the cccA cre could be demonstrated by gel shift experiments. By contrast, a DNA fragment carrying mutations in the presumed cccA cre was barely shifted by the CcpA/P-Ser-HPr complex. In footprinting experiments, the region corresponding to the presumed cccA cre was specifically protected in the presence of the CcpA/P-Ser-HPr complex." @default.
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• W2160996033 date "2001-07-01" @default.
• W2160996033 modified "2023-10-18" @default.
• W2160996033 title "Catabolite regulation of the cytochrome c550-encoding Bacillus subtilis cccA gene." @default.
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