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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (17): 1887-1891. 上一篇    下一篇

研究论文

长春新碱与人血清白蛋白的相互作用研究

陈克海1,2, 郑学仿*,1, 郭明2, 曹洪玉1, 唐乾1, 杨彦杰1   

  1. (1大连大学辽宁省生物有机化学重点实验室 大连 116622)
    (2大连大学环境与化学工程学院 大连 116622)
  • 投稿日期:2006-11-16 修回日期:2007-03-23 发布日期:2007-09-14
  • 通讯作者: 郑学仿

Investigation on the Interaction of Vincristine with Human Serum Al-bumin

CHEN Ke-Hai1,2; ZHENG Xue-Fang*,1; GUO Ming2; CAO Hong-Yu1; TANG Qian1; YANG Yan-Jie1   

  1. (1Liaoning Key Laboratory of Bioorganic Chemistry, Dalian University, Dalian 116622)
    (2 College of Environmental and Chemical Engineering, Dalian University, Dalian 116622)
  • Received:2006-11-16 Revised:2007-03-23 Published:2007-09-14
  • Contact: ZHENG Xue-Fang

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1542

被引次数

56 | 15

利用荧光和圆二色光谱研究了长春新碱(VCR)与人血清白蛋白(HSA)之间的相互作用. 通过荧光猝灭测得在288, 298和308 K时, VCR与HSA的结合常数K分别为2.14×104, 1.73×104 和1.35×104 L•mol－1, 表明VCR与HSA间具有较强的结合作用, 属于静态猝灭. 计算出焓变(ΔH)为 －17.38 kJ•mol－1, 熵变(ΔS)为22.62 J•mol－1•K－1, 结合分子模型理论计算的结果, 表明VCR与HSA相互作用时在色氨酸(Trp) 214残基和VCR分子中吲哚基间作用力以疏水作用力为主, 但在 VCR和HSA 分子间以静电引力为主. 圆二色光谱(CD)的数据表明相互作用后HSA的二级结构发生了改变：HSA的α-螺旋的含量从51.7%下降到32.9%, β-折叠的含量增加了9.2%.

关键词: 长春新碱, 人血清白蛋白, 荧光光谱, 圆二色光谱

The interaction between vincristine (VCR) and human serum albumin (HSA) was investigated by fluorescence and circular dichroism (CD) spectra at 288, 298 and 308 K. With fluorescence quenching method, the binding constants K were determined to be 2.14×104, 1.73×104 and 1.35×104 L•mol－1 respectively, indicating that the binding of VCR to HSA was strong, and the quenching mechanism was a static quenching. Enthalpy change (ΔH) was calculated to be －17.38 kJ•mol－1 and entropy change (ΔS) was 22.62 J•mol－1•K－1. Taking into account the result of molecule modeling study, all these results indicated that the hydrophobic interaction played major roles between the tryptophan (214) residue of HSA and the indole moiety of VCR, but the electrostatic interaction mostly existed between the molecules of HSA and VCR in the binding process. The secondary structure of HSA was altered (CD data) with reductions of α-helices from 51.7% to 32.9%, but increases of β-sheet by about 9.2% after VCR bound to HSA.

Key words: vincristine, human serum albumin, fluorescence spectra, circular dichroism spectra