Regulation of uridylic acid biosynthesis in the cyanobacterium Anabaena variabilis
نویسندگان
چکیده
منابع مشابه
Bioenergetics 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 کاملRNA 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 کاملTemperature-dependent regulation of the ribosomal small-subunit protein S21 in the cyanobacterium Anabaena variabilis M3.
The rpsU gene, which encodes the ribosomal small-subunit protein S21 in Anabaena, is not a part of the macromolecular-synthesis operon as in most enterobacteria but rather is located downstream of the rbpA1 gene, which encodes an RNA-binding protein. Two types of transcripts were detected for this gene cluster. The level of the major rbpA1-rpsU transcript was about 10 times higher at 22 degrees...
متن کاملRegulation of Three Nitrogenase Gene Clusters in the Cyanobacterium Anabaena variabilis ATCC 29413
The filamentous cyanobacterium Anabaena variabilis ATCC 29413 fixes nitrogen under aerobic conditions in specialized cells called heterocysts that form in response to an environmental deficiency in combined nitrogen. Nitrogen fixation is mediated by the enzyme nitrogenase, which is very sensitive to oxygen. Heterocysts are microxic cells that allow nitrogenase to function in a filament comprise...
متن کاملRegulation of nitrogenase gene expression by transcript stability in the cyanobacterium Anabaena variabilis.
The nitrogenase gene cluster in cyanobacteria has been thought to comprise multiple operons; however, in Anabaena variabilis, the promoter for the first gene in the cluster, nifB1, appeared to be the primary promoter for the entire nif cluster. The structural genes nifHDK1 were the most abundant transcripts; however, their abundance was not controlled by an independent nifH1 promoter, but rathe...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1978
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.136.2.682-687.1978