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. 1991 Mar;173(6):1879–1885. doi: 10.1128/jb.173.6.1879-1885.1991

Isolation and complementation of nitrogen fixation mutants of the cyanobacterium Anabaena sp. strain PCC 7120.

W J Buikema 1, R Haselkorn 1
PMCID: PMC207717  PMID: 1900504

Abstract

Approximately 140 mutants of Anabaena sp. strain PCC 7120 unable to grow aerobically on media lacking fixed nitrogen (Fix-) were isolated after mutagenesis with diethyl sulfate and penicillin enrichment. A large cosmid library of wild-type Anabaena sp. strain PCC 7120 DNA was constructed in a mini-RK-2 shuttle vector, and seven mutants representing several morphologically abnormal heterocyst phenotypes were complemented. One of these mutants, 216, failed to differentiate heterocysts. All of these mutants except 216 reduced acetylene under anaerobic conditions, indicating that they are not defective in nitrogen fixation per se. Several cosmids were isolated from each complemented mutant and in most cases showed similar restriction patterns. Comparisons of the complementing cosmids from mutant 216 and two other phenotypically distinct mutants by restriction enzyme analysis identified a common region. This region, when present in either a cosmid or a 9.5-kb NheI subclone, is capable of efficiently complementing all three mutants. A 2.4-kb subclone of this region complements mutant 216 only.

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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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