The study on the role of extrinsic proteins in assembly of photosystem 2 complex

光系统II复合物（PSII）的组装机制已被研究，集中在PSII组装过程中的外源蛋白质的作用。Psb28是一个新发现的与PSII结合的外源蛋白，但其功能尚不清楚。在这项研究中，我们分析了蓝细菌psb28基因的破坏突变体的PSII的性质。结果发现，在psb28突变体中，PSII组装中间产物被积累，并且PSII的修复过程被显著抑制。这些结果表明Psb28在PSII的修复过程中起重要作用。

Mechanism of assembly of photosystem II complex (PSII) has been investigated focusing on the role of extrinsic proteins in the assembly process of PSII. Psb28 is a newly identified extrinsic protein bound to PSII but its function was unknown. In this study, we analyzed properties of PSII in a disruption mutant of psb28 gene of cyanobacterium. It was found that, in the psb28 mutant, PSII assembly intermediates were accumulated and that a repair process of PSII was significantly inhibited. These results suggest that Psb28 plays an important role in the repair process of PSII.