Alterations in the accumulation of adenylylated nucleotides in heavy-metal-ion-stressed and heat-stressed Synechococcus sp. strain PCC 6301, a cyanobacterium, in light and dark
| Autor: | György Borbély, G Surányi, Z Pálfi |
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| Rok vydání: | 1991 |
| Předmět: |
Cyanobacteria
Hot Temperature Light Biochemistry chemistry.chemical_compound Adenosine Triphosphate Biosynthesis Nucleotide Molecular Biology Adenylylation chemistry.chemical_classification biology Strain (chemistry) Adenine Nucleotides Polyphosphate Mercury Cell Biology Darkness biology.organism_classification Synechococcus Adenosine Monophosphate Adenosine Diphosphate Kinetics Zinc Lead chemistry Metals bacteria Ap4A Copper Cadmium Research Article |
| Zdroj: | Biochemical Journal. 276:487-491 |
| ISSN: | 1470-8728 0264-6021 |
| DOI: | 10.1042/bj2760487 |
| Popis: | Heavy-metal-ion- (Cd2+, Cu2+, Pb2+, Hg2+ and Zn2+) or heat (50 degrees C)-stress treatments of the unicellular cyanobacterium Synechococcus sp., strain PCC 6301, under both light and dark conditions led to the accumulation of bis(5′-nucleosidyl)oligophosphates: Ap4A, Ap4G, Ap3A, Ap3G and Ap3Gp2. Under light regimens, the accumulation of Ap4A and Ap4G is more characteristic of heavy-metal-ion-stressed cells, whereas the accumulation of Ap3A, Ap3G and Ap3Gp2 is the dominant feature of heavy-metal-ion or heat-shock treatment during energy deprivation (i.e. in the dark). This accumulation of bisnucleoside oligophosphates supports a model whereby the adenylylated nucleotides are synthesized by the backward reaction of tRNA-aminoacyl synthetases. These nucleotides may also act to switch or modulate cyanobacterial responses under various environmental stress conditions. |
| Databáze: | OpenAIRE |
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