Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (6): 1023-1028.doi: 10.1007/s40242-015-5108-0

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Theoretical Investigation on Binding Process of Allophanate to Allophanate Hydrolase

ZHANG Zidong1,2, ZHANG Jilong2, ZHENG Qingchuan2, KONG Chuipeng2, LI Zhengqiang3, ZHANG Hongxing2, MA Jianzhang1   

  1. 1. College of Wildlife Resource, Northeast Forestry University, Harbin 150040, P. R. China;
    2. International Joint Research Laboratory of Nano-micro Architecture Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China;
    3. Key Laboratory for Molecular Enzymology and Engineering, Ministry of Education, Jilin University, Changchun 130012, P. R. China
  • Received:2015-03-20 Revised:2015-06-01 Online:2015-11-01 Published:2015-07-13
  • Contact: ZHANG Jilong, MA Jianzhang E-mail:jilongzhang@jlu.edu.cn;jianzhangma@163.com
  • Supported by:

    Supported by the International Postdoctoral Exchange Fellowship Program(No.20130037), the China Postdoctoral Science Foundation(Nos.2013T60320, 2013M541289), and the National Natural Science Foundation of China(Nos.21203072, 21303068).

Abstract:

Several molecular simulation methods were integrated to investigate the detailed binding process of allophanate to allophanate hydrolase and predict their stable complex structure. The optimal enzyme-substrate complex conformation demonstrates that along with Arg307 and Tyr299, Gly124 is also one of the key anchor residues in the stable complex. The energetic calculation suggests the existence of an intermediate state in the enzyme-substrate binding process. The further atomic-level investigation illuminates that Tyr299, Arg307 and Ser172 can stabilize the substrate in the intermediate state. By this token, the residues Arg307 and Tyr299 function in both binding process and getting stable state.

Key words: Allophanate hydrolase, Molecular dynamics simulation, Substrate binding, Free energy, Intermediate state