Computational studies of the O2-evolving complex of photosystem II and biomimetic oxomanganese complexes

Eduardo M. Sproviero, José A. Gascón, James P. McEvoy, Gary W. Brudvig, Victor S. Batista

Research output: Contribution to journalReview article

125 Citations (Scopus)

Abstract

In recent years, there has been considerable interest in studies of catalytic metal clusters in metalloproteins based on density functional theory (DFT) quantum mechanics/molecular mechanics (QM/MM) hybrid methods. These methods explicitly include the perturbational influence of the surrounding protein environment on the structural/functional properties of the catalytic centers. In conjunction with recent breakthroughs in X-ray crystallography and advances in spectroscopic and biophysical studies, computational chemists are trying to understand the structural and mechanistic properties of the oxygen-evolving complex (OEC) embedded in photosystem II (PSII). Recent studies include the development of DFT-QM/MM computational models of the Mn4Ca cluster, responsible for photosynthetic water oxidation, and comparative quantum mechanical studies of biomimetic oxomanganese complexes. A number of computational models, varying in oxidation and protonation states and ligation of the catalytic center by amino acid residues, water, hydroxide and chloride have been characterized along the PSII catalytic cycle of water splitting. The resulting QM/MM models are consistent with available mechanistic data, Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction data and extended X-ray absorption fine structure (EXAFS) measurements. Here, we review these computational efforts focused towards understanding the catalytic mechanism of water oxidation at the detailed molecular level.

Original languageEnglish
Pages (from-to)395-415
Number of pages21
JournalCoordination Chemistry Reviews
Volume252
Issue number3-4
DOIs
Publication statusPublished - Feb 1 2008

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Keywords

  • Density functional theory (DFT)
  • Oxomanganese complexes
  • Oxygen evolution
  • Oxygen evolving center
  • Photosynthesis
  • Photosystem II
  • Quantum mechanics/molecular mechanics (QM/MM)
  • Water oxidation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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