Circadian changes in protein-synthesis rate and protein phosphorylation in cell-free extracts of Gonyaulax polyedra
Planta, ISSN: 0032-0935, Vol: 170, Issue: 1, Page: 7-13
1987
- 19Citations
- 14Captures
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Metrics Details
- Citations19
- Citation Indexes19
- CrossRef19
- Captures14
- Readers14
- 14
Article Description
The polysomal pattern of the dinoflagellate Gonyaulax polyedra, cultured under constant conditions, demonstrates a circadian rhythm. The relative amount of polysomes increases during the phase corresponding to the previous night period (=subjective night phase) when the rate of protein synthesis reaches its maximum (Cornelius et al., 1985, Planta 160, 365-370). Cell-free extracts were isolated at different circadian phase. The rate of protein synthesis in the extracts changed rhythmically in the same manner as the rate of protein synthesis in vivo. Substances in the postribosomal supernatants influenced the protein-synthesis rate of the cell-free system, depending on the phase when they were isolated: "night factors" stimulated protein synthesis in "day extracts" whereas "day factors" inhibited protein synthesis in "night extracts". These effects were abolished by heating the postribosomal supernatant. In-vitro phosphorylation in parallel probes showed changes in the pattern of phosphorylated proteins. Phosphorylation of one of the proteins (95 kDa) was decreased after addition of "night factor(s)" and increased after addition of "day factor(s)". Cyclic-AMP enhanced the rates of protein synthesis and phosphorylation in the day extracts. © 1987 Springer-Verlag.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=34250106222&origin=inward; http://dx.doi.org/10.1007/bf00392374; http://www.ncbi.nlm.nih.gov/pubmed/24232835; http://link.springer.com/10.1007/BF00392374; https://dx.doi.org/10.1007/bf00392374; https://link.springer.com/article/10.1007/BF00392374; http://www.springerlink.com/index/10.1007/BF00392374; http://www.springerlink.com/index/pdf/10.1007/BF00392374
Springer Science and Business Media LLC
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