Photosystem II

The reaction center of oxygenic photosynthesis

David J. Vinyard, Gennady M. Ananyev, G Charles Dismukes

Research output: Contribution to journalArticle

170 Citations (Scopus)

Abstract

Photosystem II (PSII) uses light energy to split water into chemical products that power the planet. The stripped protons contribute to a membrane electrochemical potential before combining with the stripped electrons to make chemical bonds and releasing O2 for powering respiratory metabolisms. In this review, we provide an overview of the kinetics and thermodynamics of water oxidation that highlights the conserved performance of PSIIs across species. We discuss recent advances in our understanding of the site of water oxidation based upon the improved (1.9-Å resolution) atomic structure of the Mn4CaO5 water-oxidizing complex (WOC) within cyanobacterial PSII. We combine these insights with recent knowledge gained from studies of the biogenesis and assembly of the WOC (called photoassembly) to arrive at a proposed chemical mechanism for water oxidation.

Original languageEnglish
Pages (from-to)577-606
Number of pages30
JournalAnnual Review of Biochemistry
Volume82
DOIs
Publication statusPublished - Jun 2013

Fingerprint

Photosystem II Protein Complex
Photosynthesis
Water
Oxidation
Planets
Chemical bonds
Thermodynamics
Metabolism
Membrane Potentials
Protons
Electrons
Membranes
Light
Kinetics

Keywords

  • Oxygen evolution
  • Period-four oscillations
  • Photoassembly
  • Photoprotection
  • Proton-coupled electron transport
  • Water oxidation kinetics
  • Water oxidation thermodynamics

ASJC Scopus subject areas

  • Biochemistry

Cite this

Photosystem II : The reaction center of oxygenic photosynthesis. / Vinyard, David J.; Ananyev, Gennady M.; Dismukes, G Charles.

In: Annual Review of Biochemistry, Vol. 82, 06.2013, p. 577-606.

Research output: Contribution to journalArticle

Vinyard, David J. ; Ananyev, Gennady M. ; Dismukes, G Charles. / Photosystem II : The reaction center of oxygenic photosynthesis. In: Annual Review of Biochemistry. 2013 ; Vol. 82. pp. 577-606.
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