Institute of Plant Biology and Biotechnology, University of Münster, 48143 Münster, Germany.
Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan.
Biosci Rep. 2023 Jan 31;43(1). doi: 10.1042/BSR20220369.
Photosystem I (PSI) with its associated light-harvesting system is the most important generator of reducing power in photosynthesis. The PSI core complex is highly conserved, whereas peripheral subunits as well as light-harvesting proteins (LHCI) reveal a dynamic plasticity. Moreover, in green alga, PSI-LHCI complexes are found as monomers, dimers, and state transition complexes, where two LHCII trimers are associated. Herein, we show light-dependent phosphorylation of PSI subunits PsaG and PsaH as well as Lhca6. Potential consequences of the dynamic phosphorylation of PsaG and PsaH are structurally analyzed and discussed in regard to the formation of the monomeric, dimeric, and LHCII-associated PSI-LHCI complexes.
光系统 I（PSI）及其相关的光捕获系统是光合作用中最重要的还原力产生器。PSI 核心复合物高度保守，而外周亚基和光捕获蛋白（LHCI）则表现出动态的可塑性。此外，在绿藻中，PSI-LHCI 复合物以单体、二聚体和状态转换复合物的形式存在，其中两个 LHCII 三聚体相关联。本文显示了 PSI 亚基 PsaG 和 PsaH 以及 Lhca6 的光依赖性磷酸化。对 PsaG 和 PsaH 的动态磷酸化的潜在后果进行了结构分析，并就单体、二聚体和与 LHCII 相关联的 PSI-LHCI 复合物的形成进行了讨论。
