Drummond M, Clements J, Merrick M, Dixon R
Nature. 1983 Jan 27;301(5898):302-7. doi: 10.1038/301302a0.
The nitrogen fixation (nif) genes of Klebsiella pneumoniae are specifically regulated by the products of the nifLA operon. We have located the promoter of this operon, and identified sequences required for nifLA transcription. Transcription from this promoter is shown to be positively regulated by the ntrC gene product (which coordinates the expression of many operons required for nitrogen assimilation) and also autogenously by the product of the nifA gene.
肺炎克雷伯菌的固氮（nif）基因受nifLA操纵子产物的特异性调控。我们已定位该操纵子的启动子，并鉴定出nifLA转录所需的序列。该启动子的转录显示受ntrC基因产物（它协调许多氮同化所需操纵子的表达）正向调控，也受nifA基因产物自身调控。
