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Three new genes nifM, nifI and nifN have been mapped in the nif gene cluster of Klebsiella pneumoniae and a fourth gene nifJ has been confirmed as being a separate cistron. Polar nif mutations were obtained by transposition of Tn7 to plasmid pRD1, and of Tn5 and Tn10 to plasmid pMF100, a derivative of pRD1. Complementation analysis of the nif::Tn mutants led to the identification of at least six transcriptional units: nifB; nifA; nifJ; nifH, nifD and nifK; nifE and nifI; nifN, nifM and nifF. Biochemical and genetic evidence suggest that the three genes nifH, nifD and nifK, which are probably the structural genes for nitrogenase, belong to the same operon and are transcribed from nifH to nifK. A polypeptide with a molecular weight of approximately 120,000 is presumed to be the nifJ product.
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