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. 1987 May;84(10):3219–3223. doi: 10.1073/pnas.84.10.3219

Isolation of a cytochrome aa3 gene from Bradyrhizobium japonicum

Mark R O'Brian 1, Robert J Maier 1
PMCID: PMC304840  PMID: 16593835

Abstract

Bradyhizobium japonicum strain LO501 is a Tn5-induced mutant that does not express the terminal oxidase cytochrome aa3 (cytochrome-c oxidase, EC 1.9.3.1). Two and one-half kilobase pairs of LO501 genomic DNA that flanks the transposon was isolated and used as a hybridization probe to obtain the wild-type gene from a cosmid library. Two subcloned fragments from two of the isolated cosmids were ligated into broad host range vectors, and restriction maps of these fragments were generated. The resultant plasmids, pCA1 and pBL33, each contained DNA homologous to that mutated in strain LO501. The two plasmids were each introduced into strain LO501 by conjugal transfer, and it was found that pCA1, but not pBL33, complemented the oxidase mutant. The transconjugant strain LO501[pCA1] expressed wild-type levels of cytochrome aa3, as discerned spectrophotometrically, and had restored N,N,N′,N′-tetramethyl-p-phenylenediamine oxidase activity. Furthermore, the frequency of complementation of LO501 cells that received pCA1 by conjugation was 1.0, demonstrating that pCA1 complemented the mutant in trans. The results show that pCA1 contains the entire wild-type gene that was mutated in strain LO501, and this gene is required for cytochrome aa3 expression.

Keywords: bacterial cytochrome oxidase, nitrogen fixation

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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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