高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (2): 271.

• 研究论文 • 上一篇    下一篇

大鼠金属硫蛋白晶体堆积形式的理论研究

侯廷军1, 安钰2, 茹炳根2, 徐筱杰1   

  1. 1. 北京大学化学与分子工程学院;
    2. 北京大学生命科学学院, 北京 100871
  • 收稿日期:2000-10-24 出版日期:2002-02-24 发布日期:2002-02-24
  • 通讯作者: 徐筱杰(1937年出生),男,教授,博士导师,主要从事药物设计和中草药分离提取方法研究.
  • 基金资助:

    国家自然科学基金(批准号:299925902)资助

Theoretical Studies on the Crystal Packing Form of MT-Ⅱ from Rat Liver

HOU Ting-Jun1, AN Yu2, RU Bing-Gen2, XU Xiao-Jie1   

  1. 1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
    2. College of Life Sciences, Peking University, Beijing 100871, China
  • Received:2000-10-24 Online:2002-02-24 Published:2002-02-24

摘要: 考虑到蛋白质在结晶过程中溶液和晶体之间的动态平衡,蛋白质在溶液中的聚合状态决定了晶体堆积的最小单元.通过动态光散射实验以及计算机模拟,对大鼠金属硫蛋白亚型和兔肝金属硫蛋白亚型和的聚合物形式进行了比较,可以确定大鼠金属硫蛋白亚型在结晶条件下的缓冲液中应该以四聚体而不是二聚体形式存在.通过考察晶体的模型也可以发现,晶体的确可以通过四聚体的形式堆积得到,用四聚体堆积模型可以对晶体堆积作出更为合理的解释.

关键词: 金属硫蛋白, 晶体堆积, 二聚体, 三聚体, 四聚体

Abstract: Considering that the conformational units should be the same in solution as in crystals during crystallization equilibrium, the minimal crystal packing unit is determined by the style of protein aggregations in solution. Based on the comparison of MT-Ⅱ from rat liver and MT-Ⅰ and MT-Ⅱ from rabbit, it could be proven that in NaH2PO4-Na2HPO4 buffer, the aggregate of MT-Ⅱ from rat liver would be tetramer, not dimer. From the analysis of the crystal packing model, it could be naturally deduced that the crystals were obtained from the packing of tetramers; moreover, the crystal packing could be comprehended more deeply by using the tetramer packing model.

Key words: Metallothionein, Crystal packing, Dimer, Trimer, Tetramer

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