高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (4): 724.

• 研究简报 • 上一篇    下一篇

光系统Ⅱ反应中心内组氨酸参与给体端次级电子转移反应的人工模拟ESR研究

刘海锋, 刘扬, 王鹏, 张启元   

  1. 中国科学院化学研究所分子科学中心, 分子动态与稳态结构国家重点实验室, 北京 100080
  • 收稿日期:2000-04-14 出版日期:2002-04-24 发布日期:2002-04-24
  • 通讯作者: 刘扬(1958年出生),男,研究员,博士生导师,从事生物电子转移过程中的自由基及超分子化学模拟研究.
  • 基金资助:

    国家重点基础规划项目(批准号:GI998010100)和国家自然科学基金(批准号:39890390,29733100)资助.

Artificial ESR Study on Participation of Histidine in the SecondaryElectron Transfer Inside Photosystem Ⅱ Reaction Center

LIU Hai-Feng, LIU Yang, WANG Peng, ZHANG Qi-Yuan   

  1. State Key Lab for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2000-04-14 Online:2002-04-24 Published:2002-04-24

关键词: 咪唑自由基, 次级电子转移, 光系统Ⅱ反应中心人工模拟, 电子自旋共振, 自旋捕捉

Abstract: Upon the addition of imidazole (Im) to the artificial photosynthetic systems composed byZnTPP/BQand p-H2TPP-NH-CO-CH2-BQ, half-lives of ESR signals of semibenzoquinone radical BQ·- and -CH2-BQ·- are significantly prolonged by the secondary electron transfer pathway from imidazole toporphyrin cation in polar solvents.The imidazole cation radicals(Im·+) can simultaneously be identified byPBN(spin trap) both in BQ/ZnTPP/Im and p-H2TPP-NH-CO-CH2-BQ systems when laser-flashing.Onthe basis of our ESRobservation, a secondary electron transfer mechanism can be proposed as follows;(1) TPP+hv→TPP*; (2) TPP*+BQ→TPP·++BQ·-;(3) TPP·+ +Im →TPP+Im·+.

Key words: Imidazole radical, Secondary electron transfer, Artificial simulation on PS Ⅱ reaction center, ESR, Spin trapping

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