Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
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Configurtion of electron transfer cofactors in photosystem II studied by pulsed EPR

  • Asako Kawamori (Schoo1 of Science and Technology, Kwansei Gakuin University) ;
  • NobuhiroKatsuta (Schoo1 of Science and Technology, Kwansei Gakuin University) ;
  • Sachiko Arao (Schoo1 of Science and Technology, Kwansei Gakuin University) ;
  • Hideyuki Hara (EPR Application, Broker Biospin KK) ;
  • Hiroyuki Mino (Department of Physics, Nagoya University) ;
  • Asako Ishii (Labortory of Photodynamics, RIKEN) ;
  • Ono, Taka-aki (Labortory of Photodynamics, RIKEN) ;
  • Jun Minagawa (Institute of Low Temperature Science, Hokkaido University)
  • Published : 2002.08.01
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Abstract

The major electron transfer cofactors in photosystem II have been studied by pulsed EPR, pulsed electron electron double resonance (PELDOR) and laser excited spin polarized electron spin echo envelope modulation (ESEEM) methods, in non-oriented and oriented photosystem II membranes. Distances between radical pairs were determined trom the observed dipole interaction constants to be 27.3 A for P680-QA, 30 A, etc. with the error within 1 A. Angles between the distance vector and membrane normal was determined by orientation dependence of oriented membranes with the accuracy of 5˚ The results were compared with the recent structural data by X-ray analysis.

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