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J Bacteriol. Jan 1987; 169(1): 367–370.
PMCID: PMC211776

Nucleotide sequence of the gene encoding the nitrogenase iron protein of Thiobacillus ferrooxidans.


The DNA sequence was determined for the cloned Thiobacillus ferrooxidans nifH and part of the nifD genes. A putative T. ferrooxidans nifH promoter was identified whose sequences showed perfect consensus with those of the Klebsiella pneumoniae nif promoter. Two putative consensus upstream activator sequences were also identified. The amino acid sequence was deduced from the DNA sequence. In a comparison of nifH DNA sequences from T. ferrooxidans and eight other nitrogen-fixing microbes, a Rhizobium sp. isolated from Parasponia andersonii showed the greatest homology (74%) and Clostridium pasteurianum (nifH 1) showed the least homology (54%). In a comparison of the amino acid sequences of the Fe proteins, the Rhizobium sp. and Rhizobium japonicum showed the greatest homology (both 86%) and C. pasteurianum (nifH 1 gene product) demonstrated the least homology (56%) to the T. ferrooxidans Fe protein.

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Selected References

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