The tetranuclear manganese complex of Photosystem II

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Abstract

A polynuclear manganese complex functions in Photosystem II both to accumulate oxidizing equivalents and to bind water and catalyze its four-electron oxidation. Recent electron paramagnetic resonance (EPR) spectroscopic studies of the manganese complex show that four manganese ions are required to account for its magnetic properties. The exchange couplings between manganese ions in the S2 state are characteristic of a Mn4O4 "cubane"-like structure. Based on this structure for the manganese complex in the S2 state, as well as a consideration of the known properties of the manganese complex in Photosystem II and the coordination chemistry of manganese, structures are proposed for the five intermediate oxidation states of the manganese complex. A molecular mechanism for the formation of an O-O bond and the displacement of O2 from the S4 state is suggested.

Original languageEnglish
Pages (from-to)91-104
Number of pages14
JournalJournal of Bioenergetics and Biomembranes
Volume19
Issue number2
DOIs
Publication statusPublished - Apr 1987

Keywords

  • Manganese
  • Photosystem II
  • polynuclear manganese complex

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

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