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首页> 外文期刊>Acta Physica Polonica >Spectroscopy of Photosynthetic Pigment-Protein Complex LHCII
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Spectroscopy of Photosynthetic Pigment-Protein Complex LHCII

机译：光合色素-蛋白质复合物LHCII的光谱

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摘要

Light-harvesting pigment-protein complex of photosystem II is the most abundant membrane protein in the biosphere, comprising more than half chlorophyll molecules. The protein plays a role of photosynthetic antenna, collecting solar radiation and transferring excitations towards the reaction centers, where electric charge separation takes place. Efficient excitation energy capture and transfer requires unique organization of the complex and unique photophysical properties of the accessory pigments: chlorophylls and carotenoids. LHCII is also a place where extremely harmful singlet oxygen may be generated, under strong illumination conditions. Several physical mechanisms have been found in LHCII, operating to protect the photosynthetic apparatus against light-induced damage, including chlorophyll triplet and singlet excitations quenching by carotenoids. In this paper we discuss the results of our recent studies, carried out with the application of several molecular spectroscopy techniques (electronic absorption, fluorescence, resonance Raman and FTIR), designed to investigate molecular mechanisms responsible for regulation of excitation density in LHCII. Among the most interesting findings are the light-induced molecular configuration changes of the LHCII-bound xanthophylls, leading to conformational rearrangements of the protein. These mechanisms are discussed in terms of excessive excitation quenching in the pigment-protein complex subjected to overexcitation. Such an activity seems to represent a vital regulatory process in the photosynthetic apparatus, at the molecular level, protecting plants against photodegradation.
机译：光系统II的聚光色素-蛋白质复合物是生物圈中最丰富的膜蛋白，包含一半以上的叶绿素分子。该蛋白质起着光合作用天线的作用，收集太阳辐射并将激发转移到发生电荷分离的反应中心。有效的激发能量捕获和转移需要独特地组织辅助颜料的复杂而独特的光物理特性：叶绿素和类胡萝卜素。在强光条件下，LHCII也是可能产生极有害的单线态氧的地方。在LHCII中发现了几种物理机制，可保护光合作用免受光诱导的损害，包括叶绿素三重态和类胡萝卜素猝灭的单重态激发。在本文中，我们讨论了我们利用几种分子光谱技术（电子吸收，荧光，共振拉曼光谱和FTIR）进行的最新研究的结果，这些技术旨在研究负责调节LHCII中激发密度的分子机制。在最有趣的发现中是与LHCII结合的叶黄素的光诱导分子构型变化，导致蛋白质的构象重排。从过度激发的色素-蛋白质复合物中过度激发猝灭的角度讨论了这些机制。在分子水平上，这种活性似乎代表了光合作用中至关重要的调节过程，可以保护植物免受光降解。

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  • 来源
    《Acta Physica Polonica》 |2012年第2期|p.397-400|共4页
  • 作者

    W.I. Gruszecki; M. Zubik; R. Luchowski; W. Grudzinski; Z. Gryczynski; I. Gryczynski;

  • 作者单位

    Department of Biophysics, Institute of Physics, Maria Curie-Sklodowska University, Lublin, Poland;

    Department of Biophysics, Institute of Physics, Maria Curie-Sklodowska University, Lublin, Poland;

    Department of Biophysics, Institute of Physics, Maria Curie-Sklodowska University, Lublin, Poland;

    Department of Biophysics, Institute of Physics, Maria Curie-Sklodowska University, Lublin, Poland;

    Centre for Commercialization of Fluorescence Technologies, University of North Texas Health Science Center, Fort Worth, USA;

    Centre for Commercialization of Fluorescence Technologies, University of North Texas Health Science Center, Fort Worth, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    spectroscopic and microscopic techniques in biophysics and medical physics;

    机译：生物物理学和医学物理学中的光谱和显微技术;

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