Growth model of chlorosome antenna by the environment-dependent stepwise assembly of a zinc chlorophyll derivative

Growth model of chlorosome antenna by the environment-dependent stepwise assembly of a zinc chlorophyll derivative
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锌叶绿素衍生物的环境依赖性逐步组装的叶绿体天线的生长模型

DOI:
10.1007/s11120-020-00766-3
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发表时间:
2020
影响因子:
3.7
通讯作者:
Tamiaki Hitoshi
Tamiaki Hitoshi
中科院分区:
生物学3区
文献类型:
--
作者:
Matsubara Shogo;Tamiaki Hitoshi

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通过对天然存在的叶绿素a进行化学修饰,制备了在17-丙酸酯残基处具有低聚乙二醇酯的叶绿素锌衍生物,作为叶绿体中特定色素的模型,例如细菌叶绿素c、d和de。叶绿素锌衍生物在含1%(v/v)乙醇的水溶液或正己烷溶液中发生聚集,Soret/Qy吸收带发生红移和展宽,并具有强烈的圆二色性信号,表明其形成了类似于叶绿体的J型自聚集体.在水溶液或己烷溶液中制备的自聚集体的原子力显微镜图像显示薄的管状(约100 μ m)。3 nm直径)或厚的棒状聚集体(> 20 nm直径)。在将这些溶液静置几天后,纳米管或纳米棒进一步组装,分别得到带状或斜纹状聚集体。后一种转化(管到带)是由位于管外的低聚乙二醇酯之间的氢键通过水或乙醇分子引发的。这些动态的超分子转化也可能是有用的,揭示了细菌叶绿素自聚集体在叶绿体中的生长过程。
A zinc chlorophyll derivative possessing an oligoethylene glycol ester at the 17-propionate residue was prepared as a model of specific pigments in chlorosomes, such as bacteriochlorophylls-c,d, ande, by chemical modification of naturally occurring chlorophyll-a. The zinc chlorophyll derivative aggregated in aqueous or hexane solutions containing 1% (v/v) ethanol to give red-shifted and broadened Soret/Qy absorption bands with intense circular dichroism signals, indicating the formation of its chlorosome-likeJ-type self-aggregates. The atomic force microscope images of the self-aggregates prepared in aqueous or hexane solutions showed thin tube-like (ca. 3 nm diameter) or thick rod-like aggregates (> 20 nm diameter), respectively. After standing these solutions for several days, the nanotubes or nanorods further assembled to give ribbon- or bundle-like aggregates, respectively. The latter transformation (tube to ribbon) was triggered by hydrogen bonding between oligoethylene glycol esters located outside of the tubes via water or ethanol molecules. These dynamic supramolecular transformations may also be useful for revealing the growth process of bacteriochlorophyll self-aggregates in a chlorosome.
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