进化过程中不同光合作用反应中心的多种瞬态手性动力学特征

arXiv - PHYS - Chemical Physics Pub Date : 2024-09-11 DOI:arxiv-2409.06996

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

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引用次数: 0

摘要

光合反应中心（RC）从无氧细菌到含氧蓝藻和植物的进化反映了它们在结构上和功能上对环境条件的适应。手性在影响这些 RC 中关键分子的排列和功能方面发挥着重要作用。本研究调查了两种不同的 RC 中与手性有关的能量转移：本研究使用二维电子光谱（2DES）研究了两种不同的 RC：Thermochromatium tepidum（BRC）和 Thermosynechococcus vulcanus（PSII RC）中手性相关的能量转移。环极化激光脉冲揭示了瞬时手性动力学，二维色谱法突出了手性贡献。BRC 显示出更复杂的手性行为，而 PSII RC 则显示出更快的相干性衰减，这可能是对酸性压力的一种适应。通过比较 BRC 和 PSII RC 的手性动力学，可以了解光合作用蛋白质的进化和功能。

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Diverse Transient Chiral Dynamics in Evolutionary distinct Photosynthetic Reaction Centers

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.

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arXiv - PHYS - Chemical Physics

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