Abstract
Nitrogen fixation (nif) genes in Klebsiella pneumoniae are controlled by a transcriptional activation mechanism which requires the ntrA gene product acting concert with either the ntrC or nifA products (reviewed in ref. 1). The nif promoters lack the canonical −35, −10 promoter elements and instead their activation requires nucleotide sequences located around −24 and −12 (refs 2–4). We have now identified and characterized a further essential promoter sequence in the K. pneumoniae nifH, nifU, nifB and ORF promoters, located more than 100 base pairs (bp) from the transcription start site. This promoter element is required for nifA- but not ntrC-mediated activation and for the inhibition of chromosomal nif expression observed when cells harbour multiple copies of certain nif promoters5. The upstream sequence is conserved among 10 Rhizobium and 2 Azotobacter nif promoters. We show that the positioning and orientation of the upstream sequence is not critical for promoter activity up to a distance of 2 kilobases (kb) and that the upstream sequence is itself transcriptionally inactive, probably acting in cis with the downstream sequences to produce a fully active promoter. Thus, an extended promoter structure is required for nif gene expression.
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Buck, M., Miller, S., Drummond, M. et al. Upstream activator sequences are present in the promoters of nitrogen fixation genes. Nature 320, 374–378 (1986). https://doi.org/10.1038/320374a0
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DOI: https://doi.org/10.1038/320374a0
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