The light-driven oxidation of water to oxygen characteristic of oxygenic photosynthesis is catalyzed by a redox-active manganese/calcium cluster embedded in the Photosystem II (PSII) complex. How the cluster is assembled during the biogenesis and repair of PSII is unclear. Cryo-electron microscopy data have now provided new insights into the structure of a PSII complex lacking the cluster and have identified features that might be important for delivery and stabilization of Mn during assembly.

中文翻译：

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拆卸状态下的Photosystem II

嵌入光系统II（PSII）复合物中的氧化还原活性锰/钙簇可催化水氧化成光合作用的氧的特征。目前尚不清楚在PSII的生物发生和修复过程中如何组装簇。低温电子显微镜数据现在为缺乏簇的PSII复合物的结构提供了新的见解，并确定了对于组装过程中Mn的传递和稳定化可能很重要的特征。