MAIN CONCLUSION The supramolecular organization of the photosystem supercomplexes in the green alga Chlorella sorokiniana belonging to Trebouxiophyceae are essentially the same as those of Chlamydomonas reinhardtii belonging to Chlorophyceae. The photosynthetic conversion of light energy into chemical energy is performed by photosystems II and I (PSII and PSI) embedded within the thylakoid membranes. In plants and green algae, PSII and PSI comprise the core complex and light-harvesting complexes (LHCII and LHCI), forming PSII-LHCII and PSI-LHCI supercomplexes, respectively. The structural information about photosystem supercomplexes of green algae has been limited to chlorophytic algae. Here, to obtain an insight into the evolution of Chlorophyta, we determined the supramolecular organization of the PSII-LHCII and PSI-LHCI supercomplexes from the freshwater green alga Chlorella sorokiniana, which belongs to Trebouxiophyceae. The obtained results showed that the supramolecular organizations of the photosystem supercomplexes in C. sorokiniana were essentially the same as those of the model green alga C. reinhardtii, which belongs to Chlorophyceae, namely PSII-LHCII supercomplex formed the C2S2M2L2 configuration and PSI-LHCI supercomplex was associated with 10 LHCI subunits.

中文翻译：

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绿藻 Chlorella sorokiniana 光系统的结构表征

主要结论 绿藻小球藻（Chlorella sorokiniana）的光系统超复合体的超分子结构与绿藻科的莱茵衣藻（Chlamydomonas reinhardtii）基本相同。光能到化学能的光合作用转换是由嵌入类囊体膜内的光系统 II 和 I（PSII 和 PSI）进行的。在植物和绿藻中，PSII 和 PSI 包含核心复合物和捕光复合物（LHCII 和 LHCI），分别形成 PSII-LHCII 和 PSI-LHCI 超复合物。关于绿藻光系统超复合物的结构信息仅限于叶绿藻。在这里，为了深入了解绿藻的进化，我们从淡水绿藻 Chlorella sorokiniana 中确定了 PSII-LHCII 和 PSI-LHCI 超复合物的超分子组织，它属于 Trebouxiophyceae。所得结果表明，C. sorokiniana 光系统超复合体的超分子结构与绿藻科的模型绿藻莱茵衣藻基本相同，即PSII-LHCII超复合体形成C2S2M2L2构型和PSI-LHCI超复合体。与 10 个 LHCI 亚基相关。