Structure of a symmetric photosynthetic reaction center-photosystem

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

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. It is believed that they arose once froma homodimeric protein. The symmetry of a homodimer is broken in heterodimeric reaction-center structures, such as those reported previously. The 2.2-angstrom 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 bacteriochlorophylls 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. This structure preserves characteristics of the ancestral reaction center, providing insight into the evolution of photosynthesis.

Original languageEnglish (US)
Pages (from-to)1021-1025
Number of pages5
JournalScience
Volume357
Issue number6355
DOIs
StatePublished - Sep 8 2017

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Photosynthetic Reaction Center Complex Proteins
Photosynthesis
Bacteriochlorophylls
Energy Transfer
Carotenoids
Chlorophyll
Sulfur
Proteins
Iron
X-Rays
Electrons
Light
Peptides
benzoquinone

ASJC Scopus subject areas

  • Medicine(all)
  • General

Cite this

Structure of a symmetric photosynthetic reaction center-photosystem. / Gisriel, Christopher; Sarrou, Iosifina; Ferlez, Bryan; Golbeck, John H.; Redding, Kevin; Fromme, Raimund.

In: Science, Vol. 357, No. 6355, 08.09.2017, p. 1021-1025.

Research output: Contribution to journalArticle

Gisriel, C, Sarrou, I, Ferlez, B, Golbeck, JH, Redding, K & Fromme, R 2017, 'Structure of a symmetric photosynthetic reaction center-photosystem', Science, vol. 357, no. 6355, pp. 1021-1025. https://doi.org/10.1126/science.aan5611
Gisriel, Christopher ; Sarrou, Iosifina ; Ferlez, Bryan ; Golbeck, John H. ; Redding, Kevin ; Fromme, Raimund. / Structure of a symmetric photosynthetic reaction center-photosystem. In: Science. 2017 ; Vol. 357, No. 6355. pp. 1021-1025.
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