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Contiguous Organization of Nitrogenase Genes in a Heterocystous Cyanobacterium

Barry Saville, Neil Straus and John R. Coleman
Plant Physiology
Vol. 85, No. 1 (Sep., 1987), pp. 26-29
Stable URL: http://www.jstor.org/stable/4270852
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Contiguous Organization of Nitrogenase Genes in a Heterocystous Cyanobacterium
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Abstract

The organization of the three structural nitrogen fixation (nif) genes that encode nitrogenase (nif K and nif D) and nitrogenase reductase (nif H) have been examined in a number of cyanobacteria. Hybridization of Anabaena 7120 nif gene probes to restriction endonuclease-digested genomic DNA has shown (a) that cyanobacteria incapable of N2 fixation have no regions of DNA with significant homology to the three nif probes, (b) that Pseudanabaena sp., a nonheterocystous cyanobacterium, has a contiguous nif KDH gene cluster, and (c) that in contrast with other heterocystous cyanobacteria, Fischerella sp. has a contiguous nif KDH gene cluster.

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