The Electronic Structure of Lutein 2 Is Optimized for Light Harvesting in Plants
The Electronic Structure of Lutein 2 Is Optimized for Light Harvesting in Plants
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DOI：
10.1016/j.chempr.2018.12.016
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发表时间：
2019-03
期刊：
影响因子：
23.5
通讯作者：
Minjung Son;Alberta Pinnola;R. Bassi;G. Schlau-Cohen
中科院分区：
文献类型：
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作者：
Minjung Son;Alberta Pinnola;R. Bassi;G. Schlau-Cohen
在绿色植物中，类胡萝卜素（汽车）结合在含叶绿素的蛋白质中，起到捕光、光保护和结构作用。绿色植物的主要捕光复合体（LHCII）包含四个汽车，每个汽车在其自身的蛋白质口袋中具有不同的结构和能量。由于电子结构的复杂性，汽车的电子物理学，包括它们不同角色的平衡，仍然没有得到解决。我们进行了超宽带二维电子光谱LHCII的光谱带宽和时间分辨率映射的能量传递动力学和电子结构的汽车。我们发现，一个车，叶黄素2，提供了一个光收集的关系，收集能量从更高的躺在国家和funneling它下坡，部分通过一个有争议的黑暗状态观察专门叶黄素2。这些结果表明，蛋白质口袋可以通过调整几何形状来调整Car电子结构，这是植物控制太阳能捕获的物理机制。
In green plants, carotenoids (Cars) are bound within chlorophyll-containing proteins to serve light-harvesting, photoprotective, and structural roles. The major light-harvesting complex of green plants (LHCII) contains four Cars, each within its own protein pocket with distinct structure and energetics. The photophysics of the Cars, including the balance of their diverse roles, remain unresolved because of the complexity of their electronic structure. We performed ultrabroadband two-dimensional electronic spectroscopy on LHCII with the spectral bandwidth and temporal resolution to map the energy transfer dynamics and electronic structure of the Cars. We found that one Car, lutein 2, provides a nexus for light harvesting, collecting energy from higher-lying states and funneling it downhill, partially via a debated dark state observed exclusively on lutein 2. These results show that the protein pocket can tune Car electronic structure via tuning the geometry, a mechanism by which plants control the photophysics of solar energy capture.