Singlet energy dissipation in the photosystem II light-harvesting complex does not involve energy transfer to carotenoids

Müller M.G.; Lambrev P.; Reus M.; Wientjes E.; Croce R.; Holzwarth A.R.

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Singlet energy dissipation in the photosystem II light-harvesting complex does not involve energy transfer to carotenoids

机译：光系统II光捕获复合体中的单重态能量耗散不涉及将能量转移至类胡萝卜素

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The energy dissipation mechanism in oligomers of the major light-harvesting complex II (LHC II) from Arabidopsis thaliana mutants npq1 and npq2, zeaxanthin-deficient and zeaxanthinnriched, respectively, has been studied by femtosecond tran-sient absorption. The kinetics obtained at different excitation intensities are compared and the implications of singlet-singlet annihilation are discussed. Under conditions where annihilation is absent, the two types of LHC II oligomers show distributive biexponential (bimodal) kinetics with lifetimes of 5-20 ps and 00-400 ps having transient spectra typical for chlorophyll excited states. The data can be described kinetically by a two-state compartment model involving only chlorophyll excited states. Evidence is provided that neither carotenoid excited norcarotenoid radical states are involved in the quenching mechanism at variance with earlier proposals. We propose instead that a chlorophyll-chlorophyll charge-transfer state is formed in LHC II oligomers which is an intermediate in the quenching process. The relevance to non-photochemical quenching in vivo is discussed.

机译：通过飞秒瞬态吸收研究了拟南芥突变体npq1和npq2，玉米黄质缺乏和玉米黄质丰富的主要光捕获复合体II（LHC II）的低聚物的能量耗散机理。比较了在不同激发强度下获得的动力学，并讨论了单重态-单态an灭的含义。在没有an灭的条件下，这两种LHC II低聚物显示出分布双指数（双峰）动力学，其寿命为5-20 ps和00-400 ps，具有典型的叶绿素激发态瞬态光谱。可以通过仅涉及叶绿素激发态的两态区室模型来动力学描述数据。有证据表明，类胡萝卜素激发态和类胡萝卜素自由基态均不参与淬灭机理，与先前的提议有所不同。我们建议在LHC II低聚物中形成叶绿素-叶绿素电荷转移状态，这是淬灭过程的中间产物。讨论了与非光化学体内淬灭的相关性。

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《Chemphyschem: A European journal of chemical physics and physical chemistry》 |2010年第6期|共8页
作者
Müller M.G.; Lambrev P.; Reus M.; Wientjes E.; Croce R.; Holzwarth A.R.;
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正文语种 eng
中图分类物理化学（理论化学）、化学物理学;
关键词
Carotenoids; Femtochemistry; Light-harvesting complex ii; Non-photochemical quenching; Photosynthesis;

机译：类胡萝卜素;组份化学;光捕集配合物ii;非光化学猝灭;光合作用;

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1. Singlet energy dissipation in the photosystem II light-harvesting complex does not involve energy transfer to carotenoids [J] . Müller M.G., Lambrev P., Reus M., Chemphyschem: A European journal of chemical physics and physical chemistry . 2010,第6期

机译：光系统II光捕获复合体中的单重态能量耗散不涉及将能量转移至类胡萝卜素
2. Femtosecond transient absorption study of carotenoid to chlorophyll energy transfer in the light-harvesting complex II of photosystem II. [J] . Connelly JP, Muller MG, Bassi R, Biochemistry . 1997,第2期

机译：飞秒瞬态吸收研究在光系统II的光捕获复合体II中类胡萝卜素向叶绿素的能量转移。
3. Photoprotective Energy Dissipation Involves the Reorganization of Photosystem II Light-Harvesting Complexes in the Grana Membranes of Spinach Chloroplasts [J] . Johnson Matthew P., Goral Tomasz K., Duffy Christopher D. P., The Plant Cell . 2011,第4期

机译：光保护能量耗散涉及菠菜叶绿体的格兰膜中光系统II采光复合物的重组。
4. Ultrafast carotenoid-to-chlorophyll singlet energy transfer in the lightharvesting complex II of higher plants [C] . AN Macpherson, H Paulsen, T Gillbro International Congress on Photosynthesis . 2001

机译：超大类胡萝卜素对叶绿素单线态能量转移在高等植物的综合体II中
5. Light-harvesting chlorophyll a/b-protein complexes of photosystem II from the green alga, Bryopsis maxima. Pigment composition and excitation energy transfer利用統計を見る [D] . Nakayama Katsumi 1993

机译：光系统II的光捕获叶绿素a / b蛋白复合物，来自绿藻，最大藻。颜料组成和激发能转移
6. Photoprotective Energy Dissipation Involves the Reorganization of Photosystem II Light-Harvesting Complexes in the Grana Membranes of Spinach Chloroplasts [O] . Matthew P. Johnson, Tomasz K. Goral, Christopher D.P. Duffy, 2011

机译：光保护能量耗散涉及菠菜叶绿体的格兰膜中光系统II采光复合物的重组。
7. Singlet Energy Dissipation in the Photosystem II Light-Harvesting Complex Does Not Involve Energy Transfer to Carotenoids [O] . Mueller Marc G., Lambrev Petar, Reus Michael, 2010

机译：光系统II集光复合体中的单重态能量耗散不涉及将能量转移至类胡萝卜素

Singlet energy dissipation in the photosystem II light-harvesting complex does not involve energy transfer to carotenoids

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