Photosynthetic water oxidation. A new chemical model

Andrew N. Webber, Lee Spencer, Donald T. Sawyer, Robert L. Heath

Research output: Contribution to journalArticle

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Abstract

A sequential four-step chemical model for the water oxidation process in photosystem II is presented, based on the observation that a peroxide-linked biquinone complex can be chemically formed as a result of hydroxide ion addition to quinone. In our model, the hydroxide ion intermediate is generated in photosystem II as a result of proton abstraction from water. In the model, the first two flashes of light raise the oxidation state of the bimanganese center, while the third and fourth flashes of light sequentially generate the peroxide-linked biquinone which is then directly oxidized by the bimanganese center to produce oxygen and regenerate quinone.

Original languageEnglish (US)
Pages (from-to)258-262
Number of pages5
JournalFEBS Letters
Volume189
Issue number2
DOIs
StatePublished - Sep 23 1985

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Keywords

  • Cytochrome
  • Manganese
  • Oxygen evolution mechanism
  • Photosystem II
  • Plastoquinone
  • b

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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