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• W2904256744 startingPage "e0208975" @default.
• W2904256744 abstract "Azotobacter vinelandii is a nitrogen-fixing bacterium of the Pseudomonadaceae family that prefers the use of organic acids rather than carbohydrates. Thus, in a mixture of acetate-glucose, glucose is consumed only after acetate is exhausted. In a previous work, we investigated the molecular basis of this carbon catabolite repression (CCR) process under diazotrophic conditions. In the presence of acetate, Crc-Hfq inhibited translation of the gluP mRNA, encoding the glucose transporter in A. vinelandii. Herein, we investigated the regulation in the expression of the small non-coding RNAs (sRNAs) crcZ and crcY, which are known to antagonize the repressing activity of Hfq-Crc. Our results indicated higher expression levels of the sRNAs crcZ and crcY under low CCR conditions (i.e. glucose), in relation to the strong one (acetate one). In addition, we also explored the process of CCR in the presence of ammonium. Our results revealed that CCR also occurs under non-diazotrophic conditions as we detected a hierarchy in the utilization of the supplied carbon sources, which was consistent with the higher expression level of the crcZ/Y sRNAs during glucose catabolism. Analysis of the promoters driving transcription of crcZ and crcY confirmed that they were RpoN-dependent but we also detected a processed form of CrcZ (CrcZ*) in the RpoN-deficient strain derived from a cbrB-crcZ co-transcript. CrcZ* was functional and sufficient to allow the assimilation of acetate." @default.
• W2904256744 created "2018-12-22" @default.
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• W2904256744 date "2018-12-13" @default.
• W2904256744 modified "2023-10-18" @default.
• W2904256744 title "Expression of the sRNAs CrcZ and CrcY modulate the strength of carbon catabolite repression under diazotrophic or non-diazotrophic growing conditions in Azotobacter vinelandii" @default.
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• W2904256744 doi "https://doi.org/10.1371/journal.pone.0208975" @default.
• W2904256744 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6292655" @default.
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• W2904256744 hasPublicationYear "2018" @default.
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