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同步荧光光谱探究头孢西丁钠与溶菌酶的结合机制

张红彩 刘保生 程旭

张红彩, 刘保生, 程旭. 同步荧光光谱探究头孢西丁钠与溶菌酶的结合机制[J]. 中国光学(中英文), 2020, 13(3): 492-500. doi: 10.3788/CO.2019-0112
引用本文: 张红彩, 刘保生, 程旭. 同步荧光光谱探究头孢西丁钠与溶菌酶的结合机制[J]. 中国光学(中英文), 2020, 13(3): 492-500. doi: 10.3788/CO.2019-0112
ZHANG Hong-cai, LIU Bao-sheng, CHENG Xu. Study on the binding mechanism of cefoxitin sodium to lysozyme by synchronous fluorescence spectroscopy[J]. Chinese Optics, 2020, 13(3): 492-500. doi: 10.3788/CO.2019-0112
Citation: ZHANG Hong-cai, LIU Bao-sheng, CHENG Xu. Study on the binding mechanism of cefoxitin sodium to lysozyme by synchronous fluorescence spectroscopy[J]. Chinese Optics, 2020, 13(3): 492-500. doi: 10.3788/CO.2019-0112

同步荧光光谱探究头孢西丁钠与溶菌酶的结合机制

基金项目: 国家自然科学基金资助项目(No.21375032)
详细信息
    作者简介:

    张红彩(1993—),女,河北石家庄人,硕士研究生,2017年于保定学院获得学士学位,主要从事分子发光学理论与应用研究。E-mail:1179497976@qq.com

    刘保生(1963—),男,河北保定人,硕士,研究员,1986年、1992年于河北大学分别获得分析化学专业学士、硕士学位,主要从事分子发光学理论与应用研究。E-mail:lbs@hbu.edu.cn

    通讯作者:

    刘保生(1963—),男,河北保定人,硕士,研究员,1986年、1992年于河北大学分别获得分析化学专业学士、硕士学位,主要从事分子发光学理论与应用研究。E-mail:lbs@hbu.edu.cn

  • 中图分类号: O657.3

Study on the binding mechanism of cefoxitin sodium to lysozyme by synchronous fluorescence spectroscopy

Funds: Supported by National Natural Science Foundation of China (No. 21375032)
More Information
  • 摘要: 在模拟生理学条件下(pH=7.40),采用同步荧光法研究了头孢西丁钠(CFXS)和溶菌酶(LYSO)中的荧光基团酪氨酸(Tyr)残基、色氨酸(Trp)残基之间的相互作用。结果表明:CFXS以静态猝灭的方式猝灭LYSO中的Tyr、Trp残基的荧光,结合位点数n ≈1。310 K时,Tyr与Trp残基反应的荧光猝灭比率分数NSFQR(Trp)(60.25%)>NSFQR(Tyr)(39.75%),结合位置更靠近Trp残基。Hill系数nH约为1,表明CFXS与LYSO中Tyr与Trp残基的结合不会影响后继配体与蛋白质的结合。CFXS与LYSO中Tyr残基的药物结合率W(Q)为0.19%~0.13%,Trp残基的药物结合率W(Q)为0.23%~0.14%,游离的药物含量几乎不变,这表明CFXS与LYSO中Tyr与Trp残基的结合基本不影响药物的疗效。Tyr残基的蛋白结合率W(B)为52.69%~54.67%,Trp残基的蛋白结合率W(B)为67.67%~69.39%,因此,蛋白中游离的氨基酸残基数目会明显降低。CFXS-LYSO结合体系的主要作用力类型是疏水作用,分子对接结果表明CFXS与LYSO之间还存在氢键作用,且两者的最佳结合位置在LYSO的活性中心附近,两者的结合改变了活性中心处氨基酸残基的微环境。

     

  • 图 1  CFXS-LYSO体系的同步荧光光谱 (T=310 K) (a) Δλ=15 nm;(b) Δλ=60 nm

    Figure 1.  Synchronous fluorescence spectra of CFXS-LYSO system (T=310 K) (a) Δλ=15 nm; (b) Δλ=60 nm

    图 2  CFXS-LYSO体系荧光强度随NaCl浓度的变化 (T=310 K)

    Figure 2.  Fluorescence intensity of CFXS-LYSO system as a function of NaCl concentration CNacl (T=310 K)

    图 3  CFXS与LYSO相互作用的分子对接图

    Figure 3.  Molecular docking model of the interaction between CFXS and LYSO

    表  1  CFXS-LYSO体系的同步荧光猝灭反应参数

    Table  1.   Reactive parameters of synchronous fluorescence quenching for CFXS-LYSO system

    Δλ/nmT/KKsv/L·mol−1·s−1kq/L·mol−1r1Ka/L·mol−1nr2
    Δλ=602982.18×1042.18×10120.990 51.73×1041.180.992 2
    3101.61×1041.61×10120.992 41.58×1041.030.991 3
    3181.26×1041.26×10120.994 11.39×1040.960.993 5
    Δλ=152981.33×1041.33×10120.993 80.96×1041.070.995 7
    3101.17×1041.17×10120.991 40.84×1041.170.992 2
    3180.83×1040.83×10120.995 20.68×1041.120.993 4
      r1为方程I0 /I~[L]的线性相关系数;r2为方程lg[(I0-I)/I]~lg{[L]-n[Bt](I0-I)/I0}的线性相关系数;[Bt]=5.0×10−7 mol/L。
    下载: 导出CSV

    表  2  不同温度下CFXS-LYSO体系的热力学参数

    Table  2.   Thermodynamic parameters of CFXS-LYSO system at different temperatures

    SystemT/KKa/L·mol−1ΔH/kJ·mol−1ΔS/J·mol−1 K−1ΔG/kJ·mol−1
    Δλ=15 nm2980.96×104−13.1532.10−22.71
    3100.84×10432.70−23.28
    3180.68×10432.01−23.33
    Δλ=60 nm2981.73×104−11.6841.93−24.17
    3101.58×10442.70−24.91
    3181.39×10442.58−25.22
    下载: 导出CSV

    表  3  不同温度下CFXS和LYSO中Tyr、Trp残基的Hill系数

    Table  3.   Hill coefficients of Tyr and Trp residues in CFXS and LYSO at different temperatures

    T/KΔλ=60 nmΔλ=15 nm
    nHr3nHr3
    2980.940.993 70.990.997 1
    3101.150.994 81.070.993 3
    3180.920.996 70.940.995 2
      nH为体系的Hill系数;r3为方程lg[Y/(1-Y)]~lg[L]的线性相关系数。
    下载: 导出CSV

    表  4  CFXS-LYSO体系的对接能量(单位:kJ/mol)

    Table  4.   Docking energy of CFXS-LYSO system (unit: kJ/mol)

    Protein PDB IDΔG0ΔE1ΔE2ΔE3
    2LYZ−24.81−39.78−36.44−3.34
    下载: 导出CSV
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  • 收稿日期:  2019-07-23
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