Requirement of Phosphatidylglycerol for Maintenance of Photosynthetic Machinery
| العنوان: | Requirement of Phosphatidylglycerol for Maintenance of Photosynthetic Machinery |
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| المؤلفون: | Miki Hagio, Taina Tyystjärvi, Eva-Mari Aro, Hajime Wada, Virpi Paakkarinen, Isamu Sakurai, Zoltán Gombos |
| المصدر: | Plant Physiology. 133:1376-1384 |
| بيانات النشر: | Oxford University Press (OUP), 2003. |
| سنة النشر: | 2003 |
| مصطلحات موضوعية: | Phosphatidylglycerol, Photoinhibition, Photosystem II, biology, Physiology, Synechocystis, Mutant, macromolecular substances, Plant Science, biology.organism_classification, Photosynthesis, Cell biology, chemistry.chemical_compound, chemistry, Biochemistry, Thylakoid, Genetics, Photosystem |
| الوصف: | Phosphatidylglycerol (PG) is a ubiquitous component of thylakoid membranes. Experiments with the pgsA mutant of the cyanobacterium Synechocystis sp. PCC6803 defective in biosynthesis of PG have demonstrated an indispensable role of PG in photosynthesis. In the present study, we have investigated the light susceptibility of the pgsA mutant with regard to the maintenance of the photosynthetic machinery. Growth of the mutant cells without PG increased the light susceptibility of the cells and resulted in severe photoinhibition of photosynthesis upon a high-light treatment, whereas the growth in the presence of PG was protected against photoinhibition. Photoinhibition induced by PG deprivation was mainly caused by an impairment of the restoration process. The primary target of the light-induced damage in thylakoid membranes, the D1 protein of photosystem (PS) II was, however, synthesized and degraded with similar rates irrespective of whether the mutant cells were incubated with PG or not. Intriguingly, it was found that instead of the synthesis of the D1 protein, the dimerization of the PSII core monomers was impaired in the PG-deprived mutant cells. Addition of PG to photoinhibited cells restored the dimerization capacity of PSII core monomers. These results suggest that PG plays an important role in the maintenance of the photosynthetic machinery through the dimerization and reactivation of the PSII core complex. |
| تدمد: | 1532-2548 0032-0889 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::e72a413d5dbe35782b72d11292ef16fd https://doi.org/10.1104/pp.103.026955 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........e72a413d5dbe35782b72d11292ef16fd |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15322548 00320889 |
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