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Title: Structure of a symmetric photosynthetic reaction center–photosystem

Journal Article · · Science

Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. It is believed that they arose once from a homodimeric protein. The symmetry of a homodimer is broken in heterodimeric reaction center structures, such as those reported previously. The 2.2-Å resolution X-ray structure of the homodimeric reaction center/photosystem from the phototroph, Heliobacterium modesticaldum, exhibits perfect C2 symmetry. The core polypeptide dimer and two small subunits coordinate 54 (bacterio)chlorophylls and 2 carotenoids that capture and transfer energy to the electron transfer chain at the center, which performs charge separation and consists of 6 (bacterio) chlorophylls and an iron-sulfur cluster; unlike other reaction centers, it lacks a bound quinone. Furthermore, this structure preserves characteristics of the ancestral reaction center, providing insight into evolution of photosynthesis.

Research Organization:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
award317063; SC0010575; award338982; award338996
OSTI ID:
1458602
Alternate ID(s):
OSTI ID: 1494447
Journal Information:
Science, Journal Name: Science Vol. 357 Journal Issue: 6355; ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 80 works
Citation information provided by
Web of Science

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Cited By (19)

Light-driven quinone reduction in heliobacterial membranes journal March 2018
Evolution of photosynthetic reaction centers: insights from the structure of the heliobacterial reaction center journal March 2018
15N photo-CIDNP MAS NMR analysis of reaction centers of Chloracidobacterium thermophilum journal March 2018
Reaction centers of the thermophilic microaerophile, Chloracidobacterium thermophilum (Acidobacteria) I: biochemical and biophysical characterization journal June 2019
Expression and purification of affinity-tagged variants of the photochemical reaction center from Heliobacterium modesticaldum journal September 2019
Reconstitution of the heliobacterial photochemical reaction center and cytochrome c553 into a proteoliposome system journal December 2019
Intramolecular interaction of synthetic chlorophyll heterodyads with different π-skeletons journal January 2020
Why are photosynthetic reaction centres dimeric? journal January 2019
Structure of the plant photosystem I journal February 2018
A paralog of a bacteriochlorophyll biosynthesis enzyme catalyzes the formation of 1,2-dihydrocarotenoids in green sulfur bacteria journal August 2018
How nature designs light-harvesting antenna systems: design principles and functional realization in chlorophototrophic prokaryotes journal January 2018
A physiological perspective on the origin and evolution of photosynthesis journal November 2017
Thinking twice about the evolution of photosynthesis journal March 2019
Structural features of the diatom photosystem II–light‐harvesting antenna complex journal January 2020
Early Archean origin of Photosystem II journal November 2018
Reduced sulphur sources favour Hg II reduction during anoxygenic photosynthesis by Heliobacteria journal September 2019
The structure of Photosystem I acclimated to far-red light illuminates an ecologically important acclimation process in photosynthesis journal February 2020
A Molecular Biology Tool Kit for the Phototrophic Firmicute Heliobacterium modesticaldum journal August 2019
Using the Endogenous CRISPR-Cas System of Heliobacterium modesticaldum To Delete the Photochemical Reaction Center Core Subunit Gene journal September 2019

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