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Plants lacking the main light-harvesting complex retain photosystem Ⅱ macro-organization

机译：缺少主要采光复合物的植物保留了光系统Ⅱ宏观组织

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摘要

Photosystem Ⅱ (PSⅡ) is a key component of photosynthesis, the process of converting sunlight into the chemical energy of life. In plant cells, it forms a unique oligomeric macrostructure in membranes of the chloroplasts. Several light-harvesting antenna complexes are organized precisely in the PSⅡ macrostructure―the major trimeric complexes (LHCII) that bind 70% of PSⅡ chlorophyll and three minor monomeric complexes―which together form PSⅡ supercomplexes. The antenna complexes are essential for collecting sunlight and regulating photosyn- thesis, but the relationship between these functions and their molecular architecture is unresolved. Here we report that anti-sense Arabidopsis plants lacking the proteins that form LHCII trimers have PSⅡ supercomplexes with almost identical abundance and structure to those found in wild-type plants. The place of LHCII is taken by a normally minor and monomeric complex, CP26, which is synthesized in large amounts and organized into trimers. Trimerization is clearly not a specific attribute of LHCII. Our results highlight the importance of the PSⅡ macrostructure: in the absence of one of its main components, another protein is recruited to allow it to assemble and function.
机译：光系统Ⅱ（PSⅡ）是光合作用的重要组成部分，是将阳光转化为生命化学能量的过程。在植物细胞中，它在叶绿体膜上形成独特的寡聚宏观结构。 PSⅡ宏观结构中精确地组织了几种光收集天线复合物-结合70％PSⅡ叶绿素的主要三聚体复合物（LHCII）和三个次要单体复合物-一起形成PSⅡ超复合物。天线复合体对于收集阳光和调节光合作用至关重要，但这些功能与其分子结构之间的关系尚待解决。在这里我们报道缺乏形成LHCII三聚体蛋白的反义拟南芥植物具有PSⅡ超复合物，其丰度和结构与野生型植物中的那些几乎相同。 LHCII由通常较小的单体复合物CP26取代，CP26大量合成并组织成三聚体。三聚化显然不是LHCII的特定属性。我们的结果突出了PSⅡ宏观结构的重要性：在缺少其主要成分之一的情况下，募集了另一种蛋白质以使其组装和发挥功能。

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