Architecture of a charge-transfer state regulating light harvesting in a plant antenna protein

被引：441

作者：

Ahn, Tae Kyu ^{[2
,3
,4
]}

Avenson, Thomas J. ^{[3
,4
,5
]}

Ballottari, Matteo ^{[1
]}

Cheng, Yuan-Chung ^{[3
,4
]}

Niyogi, Krishna K. ^{[2
,5
]}

Bassi, Roberto ^{[1
]}

Fleming, Graham R. ^{[2
,3
,4
]}

机构：

[1] Univ Verona, Dept Sci & Technol, I-37134 Verona, Italy

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, QB3 Inst, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Dept Plant & Microbial Biol, Berkeley, CA 94720 USA

来源：

SCIENCE | 2008年 / 320卷 / 5877期

关键词：

D O I：

10.1126/science.1154800

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Energy- dependent quenching of excess absorbed light energy ( qE) is a vital mechanism for regulating photosynthetic light harvesting in higher plants. All of the physiological characteristics of qE have been positively correlated with charge transfer between coupled chlorophyll and zeaxanthin molecules in the light- harvesting antenna of photosystem II ( PSII). We found evidence for charge- transfer quenching in all three of the individual minor antenna complexes of PSII ( CP29, CP26, and CP24), and we conclude that charge- transfer quenching in CP29 involves a delocalized state of an excitonically coupled chlorophyll dimer. We propose that reversible conformational changes in CP29 can "tune" the electronic coupling between the chlorophylls in this dimer, thereby modulating the energy of the chlorophyll-zeaxanthin charge- transfer state and switching on and off the charge- transfer quenching during qE.

引用

页码：794 / 797

页数：4

共 27 条

[11] Femtosecond transient absorption study of carotenoid to chlorophyll energy transfer in the light-harvesting complex II of photosystem II [J].