化学学报 ›› 2004, Vol. 62 ›› Issue (11): 1085-1088. 上一篇    

研究简报

La3+离子对过氧化氢酶活性的影响

吉红念1, 陆天虹2,3, 李邨3, 虞学俊1, 周青4, 黄晓华1,3   

  1. 1. 江南大学化学与材料工程学院, 无锡, 214036;
    2. 中国科学院长春应用化学研究所, 长春, 130022;
    3. 南京师范大学化学与环境科学学院, 南京, 210097;
    4. 江南大学生物工程学院, 无锡, 214036
  • 投稿日期:2003-09-15 修回日期:2004-02-12 发布日期:2014-02-17
  • 通讯作者: 黄晓华,E-mail:wxxhhuang@yahoo.com E-mail:wxxhhuang@yahoo.com
  • 基金资助:
    国家自然科学基金(No.20243002),国家计委稀土专项基金(No.GJX01100626),教育部重点项目(No.02059),江苏省高新技术项目(No.BG2001045)资助项目.

Effect of La3+ Ion on the Catalytic Activity of Catalase

JI Hong-Nian1, LU Tian-Hong2,3, LI Cun3, YU Xue-Jun1, ZHOU Qing4, HUANG Xiao-Hua1,3   

  1. 1. School of Chemical and Material Engineering, Southern Yangtze University, Wuxi 214036;
    2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
    3. Department of Chemistry, Nanjing Normal University, Nanjing 210097;
    4. School of Biotechnology, Southern Yangtze University, Wuxi 214036
  • Received:2003-09-15 Revised:2004-02-12 Published:2014-02-17

利用紫外-可见吸收光谱、同步荧光及X射线光电子能谱方法研究了生理条件下稀土离子La3+对过氧化氢酶(CAT)活性的影响,并探讨了其化学过程.结果表明,生理条件下稀土离子La3+与CAT侧链氨基酸残基上的O或N原子结合,改变了O,N和s原子的电子云密度及过氧化物酶蛋白分子的空间折叠态和卟啉活性中心的易变性,从而影响了酶的活性.

关键词: 稀土镧离子, 过氧化氢酶, 结合能, 同步荧光, X射线光电子能谱, 酶活性

Effect of La3+ ion on the structure and activity of catalase, as well as the chemical process of catalase interacting with La3+ ion were investigated for the first time by a combination of ultraviolet-visible, fluorescence, synchronous fluorescence, FT infrared and X-ray photoelectron spectroscopic techniques. The results indicated that La3+ ion could interact with O and/or N groups in polypeptide chain of catalase, leading to the change of electron density of S, O and N atoms in catalase, meanwhile, making the heme active center of catalase be towards high spin state and more flexible, and causing some extent of conformational change of catalase, altering the folding state of the whole molecule, thereby changing the catalytic activity of catalase protein.

Key words: lanthanum ion, catalase, binding energy, synchronous fluorescence spectroscopy, X-ray photoelectron spectroscopy, catalytic activity