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A new approach to the systematics on the energy transfer mechanism of energy transfer in photosynthesis based on the intermediary interaction

基于中介相互作用的光合作用能量传递机制系统学新方法

基本信息

批准号：
10440240
负责人：
MIMURO Mamoru
金额：
$ 6.85万
依托单位：
YAMAGUCHI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Energy transfer processes and mechanism in the photo synthetic antenna systems were investigated based on the intermediary interaction between pigments, even though a very weak interaction has been assumed so far. We have analyzed antenna system from photosynthetic bacteria to higher plants, and obtained following results.(1) The normal mode analysis was performed on phycocyanin, one of phycobiliproteins, to investigate the interaction between pigments and peptide moieties. We found a specific interaction between nitrogen atoms of chromophores and the aspartic acid residue of peptide that determined the electronic state of chromophores. Compared with this interaction, interaction energy between pigments was lower, thus an intermediary interaction was not the case.(2) A cyanobacterium Acaryochloris marina was investigated to know the molecular architecture of the antenna system of Chlorophyll (Chl) d-containing algae. In photosystem II of this alga, an up-hill energy transfer is requisite for survival. This unique transfer system is sometime hindered by thermal energy in the case of a weak interaction, and is modified when in an intermediary interaction.(3) A typical example of the strong interaction is a pigment array in chlorosomes of a green photosynthetic bacterium Chlorofexus aurantiacus. Almost all pigments are included in the major constituents with a strong interaction, however minor components necessary for the vectorial energy flow were not included in the above category.(4) The PI has written two chapters in the textbook on the energy transfer processes and mechanisms based not on the weak interaction but on the intermediary interaction between pigments.

基于色素间的中介相互作用，研究了光合天线系统中的能量传递过程和机制，尽管迄今为止一直认为它们之间的相互作用很弱。我们对从光合细菌到高等植物的触角系统进行了分析，得到以下结果。(1)对藻胆蛋白之一藻蓝蛋白进行了简正波分析，研究了色素与肽段的相互作用。我们发现发色团的氮原子与肽的天冬氨酸残基之间存在一种特殊的相互作用，这种相互作用决定了发色团的电子状态。与这种相互作用相比，色素之间的相互作用能较低，因此不存在中间相互作用。(2)以海洋Acaryochloris marina蓝藻为研究对象，探讨了含叶绿素藻类触角系统的分子结构。在光系统II中，上坡能量转移是生存所必需的。在弱相互作用的情况下，这种独特的传递系统有时会受到热能的阻碍，并且在中间相互作用中会被修改。(3)强相互作用的一个典型例子是绿色光合细菌Chlorofexus aurantiacus的叶绿体中的色素阵列。几乎所有的色素都包含在具有强相互作用的主要成分中，然而矢量能量流所需的次要成分不包括在上述类别中。(4)PI在教科书中写了两章关于能量转移过程和机制的文章，这些过程和机制不是基于弱相互作用，而是基于颜料之间的中介相互作用。