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. 1984 Mar;157(3):925–930. doi: 10.1128/jb.157.3.925-930.1984

DNA hybridization analysis of the nif region of two methylotrophs and molecular cloning of nif-specific DNA.

A E Toukdarian, M E Lidstrom
PMCID: PMC215347  PMID: 6321444

Abstract

DNA isolated from two diazotrophic methylotrophs, the obligate methanotroph Methylosinus sp. strain 6 and the methanol autotroph Xanthobacter sp. H4-14, hybridized to DNA fragments encoding nitrogen fixation (nif) genes from Klebsiella pneumoniae. This interspecific nif homology was limited to DNA fragments encoding the nitrogenase structural proteins (nifH, nifD, and nifK) and specific methylotroph DNA sequences. The hybridization patterns obtained with the two methylotrophs were dissimilar, indicating that the nif region of methylotrophs is not physically conserved. By using the K. pneumoniae nif structural genes as a probe, a fragment of nif DNA from each methylotroph was cloned and characterized. The DNA fragment from Methylosinus sp. 6 encoded two polypeptides of 57,000 and 34,000 molecular weight.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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