Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (11): 1982.doi: 10.7503/cjcu20170063

• Organic Chemistry • Previous Articles     Next Articles

Interaction of Pyrimidine Derivatives with Human Serum Albumin

TANG Qian1,2,*(), SU Jinhong2,3, CAO Hongyu1,2, WANG Lihao2,3, SHI Fei2,3, WANG Ailing2,3, GONG Tingting1, JIN Xiaojun2,3, ZHENG Xuefang2,*()   

  1. 1. College of Life Science and Biotechnology, Dalian 116622, China
    2. Liaoning Key Laboratory of Bio-organic Chemistry, Dalian 116622, China
    3. School of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China
  • Received:2017-01-26 Online:2017-11-10 Published:2017-10-30
  • Contact: TANG Qian,ZHENG Xuefang E-mail:tangqian@dlu.edu.cn;dlxfzheng@126.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.: 21271036, 21571025, 21601023, 21601024, 21601025, 21506018)

Abstract:

The interaction of eight pyrimidine derivatives(PDs, 5-FU marked as A is the positive control, other seven samples have been made in our laboratory and numbered from B to H, respectively) with human serum albumin(HSA) have been investigated by means of steady state fluorescence, laser flash photolysis(LFP), UV-Vis absorption spectroscopy and molecular docking techniques under simulative physiological coditions. The fluorescence quenching mechanism of HSA and different pyrimidine derivatives have been analyzed by the Stern-Volmer equation and laser flash photolysis techniques. From these results, we can know that pyrimidine derivatives numbered from A to E are static quenching, but pyrimidine derivatives numbered from G to H are dynamic quenching. Depending on double reciprocal curve, we can obtain the binding constants(Ka) and the number of binding sites(n) of the five pyrimidine derivatives of static quenching and HSA. These data show that the protein and pyrimidine derivatives combinate with weak binding force and the number of binding site are equal to one. Fitting the thermodynamic parameters ΔH, ΔS and ΔG can faciliate to understand the binding force types for pyrimidine derivatives and HSA, and pyrimidine derivative B, C and E are the electrostatic and hydrophobic interactions, while for pyrimidine derivatives A and D are hydrogen bond and van der Waals force, and these experimental results are consistent with molecular docking results. According to non-radiative energy transfer theory(FRET), the binding distance(r) between HSA and pyrimidine derivaties can be obtained, which are less than 4 nm, and these results are conform to the energy transfer theory. With synchronous fluorescence, three-dimensional fluorescence and circular dichroism spectroscopy, the space conformation changes of HSA in the drugs combining process can be investigated. The results show that pyrimidine derivatives B, D and E have no influence on the secondary and tertiary structure of HSA. pyrimidine derivative A and C have no effect on secondary structure of HSA, but the hydrophobicity around the aromatic amino acids for the tertiary structure are slightly enhanced. Therefore, HSA can be used as an excellent carrier to transport and store these five pyrimidine derivatives.

Key words: Human serum albumin(HSA), Pyrimidine derivative, Three dimensional fluorescence technique, Laser flash photolysis, Molecular docking technique

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