Energy deprivation and guanosine 5'-diphosphate 3'-diphosphate synthesis in cyanobacteria.
AUTOR(ES)
Akinyanju, J A
RESUMO
A reduction in the incident light intensity has been used to elicit guanosine 5'-diphosphate 3'-diphosphate accumulation in cyanobacteria. Inhibitors of photophosphorylation, 2,4-dinitrophenol, and carbonyl cyanide-m-chlorophenyl hydrazone elicited accumulation in three species of cyanobacteria when they were grown on dinitrogen or nitrate, but not in cultures grown on ammonium or glutamine. Accumulation of guanosine 5'-diphosphate 3'-diphosphate also preceded a substantial reduction of the purine nucleoside triphosphate pools. This accumulation of guanosine 5'-diphosphate 3'-diphosphate is therefore not primarily dependent upon reduced ATP concentration or proton gradient potential, but rather upon the source of combined nitrogen. In this respect, incident light step down is not comparable with nutritional step-down procedures in heterotrophic bacteria.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=216559Documentos Relacionados
- Role of peptide chain elongation factor G in guanosine 5'-diphosphate 3'-diphosphate synthesis.
- Influence of amino acid starvation on guanosine 5'-diphosphate 3'-diphosphate basal-level synthesis in Escherichia coli.
- Positive control of lac operon expression in vitro by guanosine 5′-diphosphate 3′-diphosphate
- Identification of the bacterial alarmone guanosine 5′-diphosphate 3′-diphosphate (ppGpp) in plants
- Mechanism of the in vitro breakdown of guanosine 5'-diphosphate 3'-diphosphate in Escherichia coli.