Advances in the Spectroscopic and Structural Characterization of Core Light-Harvesting Complexes from Purple Phototrophic Bacteria,The Journal of Physical Chemistry B

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Advances in the Spectroscopic and Structural Characterization of Core Light-Harvesting Complexes from Purple Phototrophic Bacteria
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2023-01-03 , DOI: 10.1021/acs.jpcb.2c06638
Yukihiro Kimura ₁ , Kazutoshi Tani ₂ , Michael T Madigan ₃ , Zheng-Yu Wang-Otomo ₄

Affiliation

Purple phototrophic bacteria are ancient anoxygenic phototrophs and attractive research tools because they capture light energy in the near-infrared (NIR) region of the spectrum and transform it into chemical energy by way of uphill energy transfers. The heart of this reaction occurs in light-harvesting 1–reaction center (LH1–RC) complexes, which are the simplest model systems for understanding basic photosynthetic reactions within type-II (quinone-utilizing) reaction centers. In this Perspective, we highlight structure–function relationships concerning unresolved fundamental processes in purple bacterial photosynthesis, including the diversified light-harvesting capacity of LH1-associated BChl molecules, energies necessary for photoelectric conversion in the RC special pairs, and quinone transport mechanisms. Based on recent progress in the spectroscopic and structural analysis of LH1–RC complexes from a variety of purple phototrophs, we discuss several key factors for understanding how purple bacteria resource light energy in the inherently energy-poor NIR region of the electromagnetic spectrum.

中文翻译：

紫色光养细菌核心捕光复合物的光谱和结构表征研究进展

紫色光养细菌是古老的厌氧光养生物和有吸引力的研究工具，因为它们捕获光谱的近红外 (NIR) 区域的光能，并通过上坡能量转移将其转化为化学能。该反应的核心发生在光捕获 1-反应中心 (LH1-RC) 复合物中，这是理解 II 型（利用醌）反应中心内基本光合反应的最简单的模型系统。在此观点中，我们重点介绍了紫色细菌光合作用中未解决的基本过程的结构-功能关系，包括 LH1 相关 BChl 分子的多样化光捕获能力、RC 特殊对中光电转换所需的能量以及醌传输机制。

更新日期：2023-01-03

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