光系统
光系统II
磷酸化
生物
塑料醌
蛋白质磷酸化
光合作用
光系统I
拟南芥
类囊体
细胞生物学
光抑制
衣原体
莱茵衣藻
激酶
生物物理学
生物化学
蛋白激酶A
突变体
叶绿体
基因
作者
Vera Bonardi,Paolo Pesaresi,Thomas Becker,Enrico Schleiff,Raik Wagner,Thomas Pfannschmidt,Peter Jahns,Dario Leister
出处
期刊:Nature
[Springer Nature]
日期:2005-10-01
卷期号:437 (7062): 1179-1182
被引量:434
摘要
Illumination changes elicit modifications of thylakoid proteins and reorganization of the photosynthetic machinery. This involves, in the short term, phosphorylation of photosystem II (PSII) and light-harvesting (LHCII) proteins. PSII phosphorylation is thought to be relevant for PSII turnover, whereas LHCII phosphorylation is associated with the relocation of LHCII and the redistribution of excitation energy (state transitions) between photosystems. In the long term, imbalances in energy distribution between photosystems are counteracted by adjusting photosystem stoichiometry. In the green alga Chlamydomonas and the plant Arabidopsis, state transitions require the orthologous protein kinases STT7 and STN7, respectively. Here we show that in Arabidopsis a second protein kinase, STN8, is required for the quantitative phosphorylation of PSII core proteins. However, PSII activity under high-intensity light is affected only slightly in stn8 mutants, and D1 turnover is indistinguishable from the wild type, implying that reversible protein phosphorylation is not essential for PSII repair. Acclimation to changes in light quality is defective in stn7 but not in stn8 mutants, indicating that short-term and long-term photosynthetic adaptations are coupled. Therefore the phosphorylation of LHCII, or of an unknown substrate of STN7, is also crucial for the control of photosynthetic gene expression.
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