光系统II蛋白磷酸化及其生理意义

蛋白磷酸化修饰在几乎所有的生命活动中都起重要的调节作用.该文结合作者研究组的研究工作,概述了光系统II(PS II)蛋白磷酸化的调节及其生理功能.PS II复合体中的核心组分D1、D2、CP43和PsbH蛋白以及外周捕光天线(LHC II)蛋白都可以发生磷酸化.PS II蛋白磷酸化受质醌(PQ)的氧化还原状态、细胞色素b6f (Cyt b6f ) 和硫氧还蛋白以及光调节.PS II蛋白磷酸化可以调节激发能在两种光系统(PS I和PS II)之间的分配,减轻光胁迫对PS II的压力,保护核心蛋白免于光破坏,稳定PS II复合体的结构.

Photosystem II Protein Phosphorylation and Its Physiological Significance

The reversible phosphorylation of proteins plays an important role in the regulation of almost all life activities. This review focuses on the regulation of the photosystem II (PS II) protein phosphorylation and its physiological significance. Four core proteins (D1, D2, CP43 and PsbH) of the PS II complex and three proteins of the PS II peripheral antenna, Lhcb1and Lhcb2 (LHC II) as well as Lhcb4, can undergo light-dependent phosphorylation. The redox state of plastoquinone, cytochrome b 6f (Cyt b 6f) and thioredoxin play key roles in the regulation of PS II protein phosphorylation. The PS II protein phosphorylation is of great significance in balancing the distribution of excitation energy between the PS II and PS I, alleviating the excitation pressure of the excessive light on the PS II, protecting the core proteins against photodamage and stabilizing of PS II dimmer.