期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1980
卷号：77
期号：1
页码：186-190
DOI：10.1073/pnas.77.1.186
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：In the filamentous blue-green alga Anabaena 7120, aerobic nitrogen fixation is linked to the differentiation of specialized cells called heterocysts. In order to study control of heterocyst development and nitrogen fixation in Anabaena, we have used cloned fragments of the Klebsiella pneumoniae nitrogen fixation (nif) genes as probes in DNA{middle dot}DNA hybridizations with restriction endonuclease fragments of Anabaena DNA. Using this technique, we were able to identify and clone Anabaena nif genes, demonstrating the feasibility of using heterologous probes to identify genes for which no traditional genetic selection exists. From the patterns of hybridization observed, we deduced that although DNA sequence homology has been retained between some of the nif genes of these divergent organisms, the nif gene order has been rearranged.
关键词：Klebsiella pneumoniae DNA probes ; recombinant DNA ; Anabaena
