Phosphorylation of Photosystem II Controls Functional Macroscopic Folding of Photosynthetic Membranes in Arabidopsis

被引:189
作者
Fristedt, Rikard [1 ]
Willig, Adrian [2 ,3 ]
Granath, Pontus [1 ]
Crevecoeur, Michele [2 ,3 ]
Rochaix, Jean-David [2 ,3 ]
Vener, Alexander V. [1 ]
机构
[1] Linkoping Univ, Dept Clin & Expt Med, SE-58185 Linkoping, Sweden
[2] Univ Geneva, Dept Mol Biol, CH-1211 Geneva 4, Switzerland
[3] Univ Geneva, Dept Plant Biol, CH-1211 Geneva 4, Switzerland
基金
瑞典研究理事会;
关键词
CHLOROPLAST THYLAKOID MEMBRANES; PROTEIN-PHOSPHORYLATION; STATE TRANSITIONS; ELECTRON-TRANSPORT; D1; PROTEIN; IN-VIVO; REPAIR; DEGRADATION; ACCLIMATION; SUBUNIT;
D O I
10.1105/tpc.109.069435
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Photosynthetic thylakoid membranes in plants contain highly folded membrane layers enriched in photosystem II, which uses light energy to oxidize water and produce oxygen. The sunlight also causes quantitative phosphorylation of major photosystem II proteins. Analysis of the Arabidopsis thaliana stn7xstn8 double mutant deficient in thylakoid protein kinases STN7 and STN8 revealed light-independent phosphorylation of PsbH protein and greatly reduced N-terminal phosphorylation of D2 protein. The stn7xstn8 and stn8 mutants deficient in light-induced phosphorylation of photosystem II had increased thylakoid membrane folding compared with wild-type and stn7 plants. Significant enhancement in the size of stacked thylakoid membranes in stn7xstn8 and stn8 accelerated gravity-driven sedimentation of isolated thylakoids and was observed directly in plant leaves by transmission electron microscopy. Increased membrane folding, caused by the loss of light-induced protein phosphorylation, obstructed lateral migration of the photosystem II reaction center protein D1 and of processing protease FtsH between the stacked and unstacked membrane domains, suppressing turnover of damaged D1 in the leaves exposed to highlight. These findings show that the high level of photosystem II phosphorylation in plants is required for adjustment of macroscopic folding of large photosynthetic membranes modulating lateral mobility of membrane proteins and sustained photosynthetic activity.
引用
收藏
页码:3950 / 3964
页数:15
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