Contiguous Organization of Nitrogenase Genes in a Heterocystous Cyanobacterium

作者：Barry J. Saville, Neil A. Straus, John R. Coleman · 发表于：PLANT PHYSIOLOGY · 年份：1987 · DOI：10.1104/pp.85.1.26 · 被引用次数：33 · 研究领域：Photosynthetic Processes and Mechanisms、Protist diversity and phylogeny、Algal biology and biofuel production

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 N(2) 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.