Faculty of Biology, M.V. Lomonosov State University, Moscow, Russia.
K.A. Timiryazev Institute of Plant Physiology, RAS, Moscow, Russia.
FEBS Lett. 2020 Apr;594(7):1145-1154. doi: 10.1002/1873-3468.13709. Epub 2019 Dec 28.
The phycobilisome (PBS) is the cyanobacterial antenna complex which transfers absorbed light energy to the photosystem II (PSII), while the excess energy is nonphotochemically quenched by interaction of the PBS with the orange carotenoid protein (OCP). Here, the molecular model of the PBS-PSII-OCP supercomplex was utilized to assess the resonance energy transfer from PBS to PSII and, using the excitonic theory, the transfer from PBS to OCP. Our estimates show that the effective energy migration from PBS to PSII is realized due to the existence of several transfer pathways from phycobilin chromophores of the PBS to the neighboring antennal chlorophyll molecules of the PSII. At the same time, the single binding site of photoactivated OCP and the PBS is sufficient to realize the quenching.
藻胆体（PBS）是蓝细菌天线复合物，它将吸收的光能转移到光系统 II（PSII），而多余的能量则通过 PBS 与橙色类胡萝卜素蛋白（OCP）的相互作用非光化学猝灭。在这里，利用 PBS-PSII-OCP 超复合物的分子模型来评估从 PBS 到 PSII 的共振能量转移，并利用激子理论来评估从 PBS 到 OCP 的转移。我们的估计表明，由于从 PBS 的藻胆色素到 PSII 的邻近天线叶绿素分子存在几种转移途径，因此从 PBS 到 PSII 的有效能量迁移得以实现。同时，光激活的 OCP 和 PBS 的单个结合位点足以实现猝灭。
