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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Self-Assembly of Zinc Bacteriochlorophyll d Derivative Possessing a Triethoxysilyl Group at the 17-Propionate Residue
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Self-Assembly of Zinc Bacteriochlorophyll d Derivative Possessing a Triethoxysilyl Group at the 17-Propionate Residue

机译：在17-丙酸盐残基中具有三乙氧基甲硅烷基的锌菌种衍生物的自组装

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摘要

Transformation of pigment assembly in photosynthetic supramolecules is an important event in the performance of efficient photosynthetic activities, and model systems mimicking such transformation are useful to elucidate dynamic processes in natural photosynthetic systems. In this paper, we report stimuli-induced self-aggregation of a synthetic zinc bacteriochlorophyll d derivative possessing a triethoxysilyl group at the 17-propionate (Zn chlorin 1) as a model system of chlorosomes, which are extramembranous and major light-harvesting complexes in green photosynthetic bacteria. A mixture of monomeric and dimeric species of epimerically pure Zn chlorin 1 was gradually converted into chlorosomal self-aggregates that exhibited a red-shifted Q(y) absorption band and the CD signal at the corresponding region around 750nm in an aqueous alkaline solution. The finally obtained visible absorption and CD spectra of 1 under the alkaline conditions were almost identical to the spectra of 1 lacking ethoxy groups by alkaline hydrolysis in advance, indicating that the above spectral changes of 1 observed under the alkaline conditions were ascribable to hydrolysis of the ethoxysilyl group in 1. The alteration of assembling states of synthetic zinc chlorin 1 triggered by its chemical modification will be a clue to the construction of model systems for in vivo formation of chlorosomes in green photosynthetic bacteria.
机译：颜料组件在光合素分布中的转化是在高效的光合作用活动中的重要事件，模拟这种转化的模型系统可用于阐明天然光合体系中的动态过程。在本文中，我们报告了在17-丙酸盐（Zn氯丁1）中具有三乙氧基甲硅烷基的合成锌菌氯苯基D衍生物的刺激性自聚集，作为氯体的模型系统，这是含有掺入和重大的光收获络合物绿色光合细菌。将纯纯Zn氯包含单体和二聚体物质的混合物逐渐转化为在碱性碱水溶液中在约750nm的相应区域上显示出红移Q（Y）吸收带和CD信号。在碱性条件下最终获得的1的可见吸收和Cd光谱与碱性水解的1缺少乙氧基的光谱几乎相同，表明在碱性条件下观察到的1的上述光谱变化依赖于水解乙醇综合组在1.其化学改性触发的合成锌氯化锌1的组装状态的改变将是用于在绿色光合细菌中体内形成氯体的模型系统的线索。

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    Takahashi Naoya; Shoji Sunao; Tamiaki Hitoshi; Saga Yoshitaka;

  • 作者单位

    Kinki Univ Fac Sci &

    Engn Dept Chem Higashiosaka Osaka 5778502 Japan;

    Ritsumeikan Univ Fac Sci &

    Engn Dept Biosci &

    Biotechnol Kusatsu Shiga 5258577 Japan;

    Ritsumeikan Univ Fac Sci &

    Engn Dept Biosci &

    Biotechnol Kusatsu Shiga 5258577 Japan;

    Kinki Univ Fac Sci &

    Engn Dept Chem Higashiosaka Osaka 5778502 Japan;

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  • 正文语种 eng
  • 中图分类 化学;
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