A near infrared electronic transition associated with conversion between S-states of the photosynthetic O2-evolving complex

G. Charles Dismukes, Paul Mathis

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36 Scopus citations

Abstract

A new electronic transition is observable in O2-evolving photosynthetic membranes of spinach enriched in Photosystem II. The transition occurs predominantly in the oxidation state created after a single flash of light (S2 state). It oscillates in yield with a period of flashes when exposed to a train of short light flashes. Conditions which abolish O2 evolution and remove functional manganese destroy this effect. The spectrum and absorptivity of the oscillating component are similar to those found in synthetic manganese dimers poised in the mixed-valent oxidation state Mn2(III,IV). A similar structural unit is thus implicated for the manganese site involved in O2 evolution.

Original languageEnglish (US)
Pages (from-to)51-54
Number of pages4
JournalFEBS Letters
Volume178
Issue number1
DOIs
StatePublished - Dec 3 1984
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

Keywords

  • Electronic spectroscopy
  • Manganese
  • Photosynthetic oxygen evolution
  • Water oxidation

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