Structure of a symmetric photosynthetic reaction center–photosystem

Gisriel, Christopher; Sarrou, Iosifina; Ferlez, Bryan; Golbeck, John H.; Redding, Kevin E.; Fromme, Raimund

doi:10.1126/science.aan5611

Title: Structure of a symmetric photosynthetic reaction center–photosystem

Journal Article · 27 July 2017 · Science

DOI: https://doi.org/10.1126/science.aan5611 · OSTI ID:1458602

^[1]; Sarrou, Iosifina ^[2];

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Arizona State Univ., Tempe, AZ (United States)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
The Pennsylvania State Univ., University Park, PA (United States)
Arizona State Univ., Tempe, AZ (United States); Biodesign Institute, Tempe, AZ (United States)

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.

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Research Organization:: Arizona State Univ., Tempe, AZ (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: SC0010575; award317063; award338982; award338996

OSTI ID:: 1458602

Alternate ID(s):: OSTI ID: 1494447

Journal Information:: Science, Vol. 357, Issue 6355; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 91 works

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