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Molecular Biology and Evolution, Vol 9, 495-506, Copyright © 1992 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Nucleotide sequence of nifD from Frankia alni strain ArI3: phylogenetic inferences

P Normand, M Gouy, B Cournoyer and P Simonet
Laboratoire d'Ecologie Microbienne du Sol, Universite Claude-Bernard- Lyon I, France.

The complete nucleotide sequence of the nifD gene encoding the alpha subunit of component I of nitrogenase from Frankia alni strain ArI3 was determined. The coding region is 1,458 bp in length and encodes a polypeptide of 486 residues with a predicted molecular weight of 53,500. Phylogenetic inferences with 12 complete published nifD sequences were drawn using a variety of approaches. Frankia nifD clusters with proteobacteria rather than with Clostridium pasteurianum, the other Gram-positive bacterium studied. Extant eubacterial nif genes seem to have at least three distinct evolutionary origins as a result of ancient gene duplications. Within the Gram-positive bacterial phylum, functional nif genes descend from different duplicates.
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