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arXiv 2409.06996physics.chem-ph
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进化上不同的光合反应中心中的多样瞬态手性动力学

Diverse Transient Chiral Dynamics in Evolutionary distinct Photosynthetic Reaction Centers

Yonglei Yang, Zihui Liu, Fulu Zheng, Panpan Zhang, Hongxing He, Ajay Jha, Hong-Guang Duan

AI总结:

本研究利用二维电子光谱探究两种进化不同的光合反应中心的手性能量转移,发现二者手性动力学存在差异,为光合蛋白演化与功能研究提供了新视角。

摘要:

光合反应中心(RCs)从不产氧细菌到产氧蓝细菌和植物的演化,反映了其结构与功能对环境条件的适应。手性在影响这些反应中心内关键分子的排布与功能方面发挥着重要作用。本研究采用二维电子光谱(2DES),探究了两种不同反应中心——嗜热菌(Thermochromatium tepidum,BRC)和嗜热聚球藻(Thermosynechococcus vulcanus,PSII RC)中与手性相关的能量转移。圆偏振激光脉冲揭示了瞬态手性动力学,其中二维圆二色(2DCD)光谱凸显了手性贡献。BRC表现出更复杂的手性行为,而PSII RC的相干衰减更快,这可能是对氧化应激的一种适应。对比BRC与PSII RC的手性动力学,可为理解光合蛋白质的演化与功能提供新见解。

英文摘要:

The evolution of photosynthetic reaction centers (RCs) from anoxygenic bacteria to oxygenic cyanobacteria and plants reflects their structural and functional adaptation to environmental conditions. Chirality plays a significant role in influencing the arrangement and function of key molecules in these RCs. This study investigates chirality-related energy transfer in two distinct RCs: Thermochromatium tepidum (BRC) and Thermosynechococcus vulcanus (PSII RC) using two-dimensional electronic spectroscopy (2DES). Circularly polarized laser pulses reveal transient chiral dynamics, with 2DCD spectroscopy highlighting chiral contributions. BRC displays more complex chiral behavior, while PSII RC shows faster coherence decay, possibly as an adaptation to oxidative stress. Comparing the chiral dynamics of BRC and PSII RC provides insights into photosynthetic protein evolution and function.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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