AN ELECTRON-SPIN ECHO ENVELOPE MODULATION STUDY OF THE PRIMARY ACCEPTOR QUINONE IN ZN-SUBSTITUTED PLANT PHOTOSYSTEM-II

被引:45
作者
ASTASHKIN, AV
KAWAMORI, A
KODERA, Y
KUROIWA, S
AKABORI, K
机构
[1] KWANSEI GAKUIN UNIV,FAC SCI,NISHINOMIYA,HYOGO 662,JAPAN
[2] KITASATO UNIV,SCH SCI,SAGAMIHARA,KANAGAWA 228,JAPAN
[3] HIROSHIMA UNIV,FAC INTEGRATED ARTS & SCI,HIGASHIHIROSHIMA 724,JAPAN
关键词
D O I
10.1063/1.469289
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A Fe2+ ion on the acceptor side of plant photosystem II has been substituted by Zn2+ and an anion radical of the primary acceptor quinone, QA-, has been studied by electron spin echo method. The electron spin echo modulation shows the interaction of the unpaired electron of QA- with nitrogen nuclei of the histidine and, probably, alanine residues situated nearby. The comparison of the modulation spectra of QA- with those of the anion radical of plastoquinone-9 stabilized in protonated and deuterated isopropanol matrices allows one to distinguish between the spectrum lines due to the quinone protons and due to the protons of other molecules that form hydrogen bonds with the oxygen atoms of the quinones. © 1995 American Institute of Physics.
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页码:5583 / 5588
页数:6
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