Photosystem I (PSI) is one of the two photosystems in photosynthesis, and generates reducing power required for carbon dioxide fixation. PSI exists as a reaction center core in cyanobacteria but is surrounded by light-harvesting antenna complexes (LHCI) to form PSI-LHCI supercomplexes in eukaryotic organisms. The structures of PSI core and PSI-LHCI have been reported from various organisms. We compare these structures and highlight the differences among different organisms. While the PSI core is more conserved, there are differences in its subunit composition and organization. Larger differences are found in the subunit composition, organization, and pigment binding in LHCI. All these changes can be explained in the framework of better adaptation to different light environment that each photosynthetic organism inhabits.

中文翻译：

---

响应于对不同光环境的适应，光系统I天线超复合物的结构变化。

光系统I（PSI）是光合作用中的两个光系统之一，它会产生二氧化碳固定所需的降低功率。PSI作为蓝细菌的反应中心核心存在，但在真核生物中被光捕获触角复合体（LHCI）包围以形成PSI-LHCI超复合体。已经从多种生物中报道了PSI核心和PSI-LHCI的结构。我们比较这些结构，并强调不同生物之间的差异。虽然PSI核心更为保守，但其亚基组成和组织却有所不同。在LHCI中发现亚基组成，组织和色素结合的差异更大。所有这些变化都可以在更好地适应每种光合生物所居住的不同光照环境的框架下进行解释。