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The xylABC promoter from the Pseudomonas putida TOL plamid is activated by nitrogen regulatory genes in Escherichia coli

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Summary

The xylABC promoter (OP1), located on the TOL plasmid of Pseudomonas putida contains sequences homologous to the conserved regions found in nitrogen fixation (nif) promoters and in other promoters subject to nitrogen control. XylA-lac fusions were constructed in order to monitor expression from the OP1 promoter in Escherichia coli. Transcription was activated in the presence of the heterologous regulatory genes ntrC or nifA from Klebsiella pneumoniae as well as by the homologous P. putida regulatory gene xylR. In all cases activation was also dependent on the ntrA gene, whose product has been implicated as a specific sigma factor for ntr activatable operons. The 5′ ends of xylA mRNA, detected by S1 nuclease mapping of in vivo transcripts, were identical in strains containing xylR, ntrC or nifA as transcriptional activators. However, activation of the K. pneumoniae nifL or nifH promoters by xylR was not detected.

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  1. AFRC Unit of Nitrogen Fixation, University of Sussex, BN1 9RQ, Brighton, Great Britain

    Ray Dixon

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Communicated by C. Auerbach

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Dixon, R. The xylABC promoter from the Pseudomonas putida TOL plamid is activated by nitrogen regulatory genes in Escherichia coli . Mol Gen Genet 203, 129–136 (1986). https://doi.org/10.1007/BF00330393

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  • DOI: https://doi.org/10.1007/BF00330393

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