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. 1983 Oct;156(1):251–256. doi: 10.1128/jb.156.1.251-256.1983

Genetic and physical map of the structural genes (nifH,D,K) coding for the nitrogenase complex of Rhodopseudomonas capsulata.

P Avtges, P A Scolnik, R Haselkorn
PMCID: PMC215077  PMID: 6311797

Abstract

Functional genes coding for the structural components of the nitrogenase complex (nifH,D,K) have been cloned on an 11.8-kilobase-pair HindIII fragment of DNA from the photosynthetic bacterium Rhodopseudomonas capsulata. The genes were physically mapped by hybridization of individual cloned nif genes from Klebsiella pneumoniae and Anabaena sp. strain 7120 to Southern blots of HindIII digests of the cloned R. capsulata fragment, after introduction of HindIII sites into the latter at specified locations by insertion of Tn5. Plasmids with the 11.8-kilobase-pair HindIII fragment containing the Tn5 insertions were also used for complementation tests with chromosomal Nif- mutations and for the generation of subfragments to locate those mutations by marker rescue. The R. capsulata nifH,D,K genes comprise a single unit of expression, with the same organization and polarity as found in K. pneumoniae. However, the R. capsulata nifH,D,K fragment did not complement Nif- point mutations in the corresponding Klebsiella genes, and the Klebsiella nif genes did not function in R. capsulata.

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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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