Architecture of the photosynthetic complex from a green sulfur bacterium

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 The Gsb...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2020-11, Vol.370 (6519)
Main Authors: Chen, Jing-Hua, Wu, Hangjun, Xu, Caihuang, Liu, Xiao-Chi, Huang, Zihui, Chang, Shenghai, Wang, Wenda, Han, Guangye, Kuang, Tingyun, Shen, Jian-Ren, Zhang, Xing
Format: Article
Language:English
Subjects:
Antennas
Bacteria
Bacterial Proteins - chemistry
Carotenoids
Chain branching
Chains
Charge transfer
Chemical energy
Chlorobaculum tepidum
Chlorobi - enzymology
Chlorophyll
Core protein
Cryoelectron Microscopy
Cytoplasm - enzymology
Efficiency
Electron microscopy
Energy
Energy conversion efficiency
Energy harvesting
Energy Transfer
Evolution
Green sulfur bacteria
Light
Microscopy
Periplasm - enzymology
Photosynthesis
Photosynthetic apparatus
Photosystem I Protein Complex - chemistry
Photosystem II
Photosystem II Protein Complex - chemistry
Pigments
Protein Conformation
Protein structure
Proteins
Quinones
Reaction centers
Separation
Sulfur
Sulfur bacteria
Task complexity
Trimers
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Summary: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 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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.abb6350