Investigation of electronic structure of P680 in photosystem II reaction center

DOI

Bibliographic Information

Other Title
  • 光化学系II反応中心のP680+の電子構造の研究

Abstract

Oxygen evolution is carried out in Photosystem II (PSII) supercomplex in higher plant and cyanobacteria. PSII contains primary donor P680, consisted of chlorophylls (Chls). In order to oxidize water, P680+ was required to maintain high redox potential of about +1.2 V. In the early report, CW-ENDOR study showed that 82% of the unpaired electron spin was delocalized on one Chl molecule in P680+ in PSII reaction center (PSII RC). On the other hand, FTIR study shows that positive charge is shared equally on the two Chls.<br>In this study, we measured Electron Spin Echo Envelope Modulation (ESEEM) spectrum of P680+. The obtained hyperfine constants (hfcs) were 2.7 and 2.0 MHz. The hfcs of 3.18 and 2.95 MHz were obtained in isolated Chl a+. The results indicate that 68-85% of an electron spin delocalized on one Chl in P680+. In addition, we measured the ESEEM spectrum of ChlZ+. Based on these results, we will discuss the electron structure of P680+.

Journal

Details 詳細情報について

  • CRID
    1390001205634126720
  • NII Article ID
    130006996348
  • DOI
    10.14841/jspp.2011.0.0319.0
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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