高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (7): 996.

• 研究论文 • 上一篇    下一篇

固氮酶活性中心结构模型的EHMO研究

刘爱民, 周泰锦, 万惠霖, 蔡启瑞   

  1. 厦门大学化学系, 厦门 361005
  • 收稿日期:1993-04-05 修回日期:1993-06-03 出版日期:1993-07-24 发布日期:1993-07-24
  • 通讯作者: 刘爱民.
  • 作者简介:第一作者:男, 29岁, 博士, 博士后.
  • 基金资助:

    国家基础性研究重大关键项目(攀登计划);国家教育委员会博士后基金

Structural Information of Nitrogenase Active-Center Clusters Deduced from EHMO Study

LIU Ai-Min, ZHOU Tai-Jin, WAN Hui-Lin, TSAI Khi-Rui   

  1. Department of Chemistry, Xiamen University, Xiamen, 361005
  • Received:1993-04-05 Revised:1993-06-03 Online:1993-07-24 Published:1993-07-24

摘要: 应用群分解EHMO程序,研究了基于MoFe-蛋白X射线衍射结果的固氮酶活性中心结构模型.对比和分析了该模型中尚未确定的配体Y分别为S、O、N、C、H和H…H时的总能量和电荷分布等.结果表明Y=O量为有利.本文进一步提出了Y=O的模型在底物活化过程中Y(O)的邻位加氢后作为活性中心吞吐底物与产物窗口的可能作用方式.

关键词: 固氮酶, 活性中心, 模型化合物, EHMO量子化学方法

Abstract: Structural models for the nitrogenase FeMo-cofactor based upon the crystallographic analysis of the nitrogenase MoFe-protein were studied by means of the improved method of EHMOcalculations, where the interest was focused on the unknown ligand Yof the Ree's model.The results gained from cases of Y=S, N,O, C, Hand H…Hsuggested that the ligand Ywas very like O (model I0 and model X).Aprobable hydrogenation mechanism (model L) was eventually proposed and discussed in the present paper.

Key words: Nitrogenase, Activity center, Model compounds, EHMO Quantum chemistry approach

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