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The nucleotide sequence of the structural gene (nifD ) coding for the α-subunit of dinitrogenase along with its flanking sequences has been determined in cowpeaRhizobium IRc78. The coding sequence consists of 1500 nucleotides, which corresponds to a predicted amino acid sequence of 500 residues and a molecular weight of 56,025. Nucleotide homology tonifD from the blue-green alga,Anabaena , andParasponia Rhizobium , are 63% and 90%, respectively. CowpeaRhizobium IRc78nifD andnifK (encodes the β-subunit of dinitrogenase) genes are linked, separated by 69 nucleotides. In contrast to fast-growing rhizobia, the structural genes of dinitrogenase (nifDK ) are transcribed from a different promoter than the structural gene of dinitrogenase reductase (nifH ). Transcription ofnifDK initiates 41 nucleotides upstream of the start codon for thenifDK operon. Two transcription initiation sites, localized at 152 and 114 nucleotides upstream of the start codon, were determined for thenifH operon. Two nucleotide sequences, a hexamer (G-G-T-T-G-C) and a pentamer (T-G-G-C-A), centered at approximately -15 and -25, respectively, are conserved in thenifD andnifH promoter regions and are not present in the 69-nucleotidenifDK junction. No sequence homology other than a possible ribosome binding site, T-T-G-A-[unk]-G-G-A, located 14 nucleotides upstream of the initiation codon was detected between the transcribed but untranslated leader regions ofnifD andnifH .

proceedings of the national academy of sciences of the united states of america

Structural genes of dinitrogenase and dinitrogenase reductase are transcribed from two separate promoters in the broad host range cowpea <i>Rhizobium</i> strain IRc78

Structural genes of dinitrogenase and dinitrogenase reductase are transcribed from two separate promoters in the broad host range cowpea Rhizobium strain IRc78