浙江大学基础医学院张兴课题组与中国科学院植物研究所匡廷云/沈建仁课题组合作报道了绿硫细菌Chlorobaculum tepidum内周捕光天线FMO-反应中心复合体 (FMO-GsbRC) 的2.7埃冷冻电镜结构。该研究于2020年11月20日发表于国际一流学术期刊《科学》。

Title: Architecture of the photosynthetic complex from a green sulfur bacterium

Author: Jing-Hua Chen, Hangjun Wu, Caihuang Xu, Xiao-Chi Liu, Zihui Huang, Shenghai Chang, Wenda Wang, Guangye Han, Tingyun Kuang, Jian-Ren Shen, Xing Zhang

Issue&Volume: 2020/11/20

Abstract: The photosynthetic apparatus of green sulfur bacteria (GSB) contains a peripheral antenna chlorosome, light-harvesting Fenna-Matthews-Olson proteins (FMO), and a reaction center (GsbRC). We used cryo–electron microscopy to determine a 2.7-angstrom structure of the FMO-GsbRC supercomplex from Chlorobaculum tepidum. The GsbRC binds considerably fewer (bacterio)chlorophylls [(B)Chls] than other known type I RCs do, and the organization of (B)Chls is similar to that in photosystem II. Two BChl layers in GsbRC are not connected by Chls, as seen in other RCs, but associate with two carotenoid derivatives. Relatively long distances of 22 to 33 angstroms were observed between BChls of FMO and GsbRC, consistent with the inefficient energy transfer between these entities. The structure contains common features of both type I and type II RCs and provides insight into the evolution of photosynthetic RCs.

DOI: 10.1126/science.abb6350

Source: https://science.sciencemag.org/content/370/6519/eabb6350