Geometry, Supertransfer, and Optimality in the Light Harvesting of Purple Bacteria
Geometry, Supertransfer, and Optimality in the Light Harvesting of Purple Bacteria
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DOI：
10.1021/acs.jpclett.6b01779
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发表时间：
2016-10-06
影响因子：
5.7
通讯作者：
Kassal, Ivan
中科院分区：
文献类型：
--
作者：
Baghbanzadeh, Sima;Kassal, Ivan
长期以来，人们一直认为紫色细菌的光合天线复合体具有显着的旋转对称性，可以增强其光捕获和激发能量传输。我们通过对假设的天线进行建模来研究对称性的作用，该天线的对称性通过改变细菌叶绿素色素的方向而被打破。我们发现，在 LH2 和 LH1 复合体中，对称性通过实现协作、连贯的超转移过程来提高能量转移率。这种增强在 LH1 复合体中尤其明显，其自然几何形状比平均随机几何形状高出 5.5 个标准差，这是在光合复合体中发现的最显着的相干性相关增强。
The remarkable rotational symmetry of the photosynthetic antenna complexes of purple bacteria has long been thought to enhance their light harvesting and excitation energy transport. We study the role of symmetry by modeling hypothetical antennas whose symmetry is broken by altering the orientations of the bacteriochlorophyll pigments. We find that in both LH2 and LH1 complexes, symmetry increases energy transfer rates by enabling the cooperative, coherent process of supertransfer. The enhancement is particularly pronounced in the LH1 complex, whose natural geometry outperforms the average randomized geometry by 5.5 standard deviations, the most significant coherence-related enhancement found in a photosynthetic complex.