Glycogen Accumulation and the Induction of Nitrogenase Activity in the Heterocyst-forming Cyanobacterium Anabaena variabilis
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چکیده
منابع مشابه
RNA processing of nitrogenase transcripts in the cyanobacterium Anabaena variabilis.
Little is known about the regulation of nitrogenase genes in cyanobacteria. Transcription of the nifH1 and vnfH genes, encoding dinitrogenase reductases for the heterocyst-specific Mo-nitrogenase and the alternative V-nitrogenase, respectively, was studied by using a lacZ reporter. Despite evidence for a transcription start site just upstream of nifH1 and vnfH, promoter fragments that included ...
متن کاملEffect of glutamine on growth and heterocyst differentiation in the cyanobacterium Anabaena variabilis.
Mutants of the cyanobacterium Anabaena variabilis that were capable of increased uptake of glutamine, as compared with that in the parental strains, were isolated. Growth of these mutants and their parental strains was measured in media containing N2, ammonia, or glutamine as a source of nitrogen. All strains grew well with any one of these sources of fixed nitrogen. Much of the glutamine taken...
متن کاملThe Expression of a Third Nitrogenase in the Cyanobacterium Anabaena variabilis
Physiological experiments indicate that Anabaena variabilis can express either a Vor a Fe-nitrogenase in addition to the conventional, Mo-containing enzyme complex. The occur rence o f the Fe-nitrogenase in A. variabilis can also be concluded from D N A -D N A hybridiza tion experiments using cloned anfW or nifW probes coding for the smaller subunit (= nitroge nase reductase) o f the Fe-nitr...
متن کاملBioenergetics Studies of the Cyanobacterium Anabaena variabilis
A cell-free system exhibiting both photophosphorylation (P /2e = 1) and oxidative phosphoryla tion (P/O up to 0 .8 ) is described for the cyanobacterium Anabaena variabilis. NADH and N A D PH were found to be equally effective as electron donors for oxidative phosphorylation. Low concentrations of U H D B T , an inhibitor of the cytochrome blc complex of mitochondria and chloroplasts. were fou...
متن کاملCharacterization of genes for a second Mo-dependent nitrogenase in the cyanobacterium Anabaena variabilis.
Anabaena variabilis ATCC 29413 is a filamentous heterocystous cyanobacterium that fixes nitrogen under a variety of environmental conditions. Under aerobic growth conditions, nitrogen fixation depends upon differentiation of heterocysts and expression of either a Mo-dependent nitrogenase or a V-dependent nitrogenase in those specialized cells. Under anaerobic conditions, a second Mo-dependent n...
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ژورنال
عنوان ژورنال: Microbiology
سال: 1985
ISSN: 1350-0872,1465-2080
DOI: 10.1099/00221287-131-12-3147