测量蛋白质分析物的亲和力,狂热力和结合动力学,具有动态可切换的生物表面
Jelena Knezevic1, Andreas Langer, Paul A Hampel
1Walter Schottky Institute & Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany.
Journal of the American Chemical Society
|September 6, 2012
概括
这项研究引入了一种无标签的方法,使用DNA杆实时分析蛋白质-连接体相互作用. 交换SENSE技术准确量化结合动力学和亲和关系,揭示了对蛋白质相互作用的环境影响.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 分析化学 分析化学
背景情况:
- 分析蛋白质-连接体相互作用对于理解生物过程和药物开发至关重要.
- 现有的方法通常需要标签,或者它们在同时提供动力和亲和数据的能力上是有限的.
- 开发用于实时交互分析的无标签技术是一个正在进行的研究领域.
研究的目的:
- 引入和验证一种新的无标签方法,switchSENSE,用于分析蛋白质-配体相互作用.
- 为了证明switchSENSE在量化结合动力学,亲和力和狂热效应方面的能力.
- 为了在不同条件下比较多种蛋白质与常见联结体的结合行为.
主要方法:
- 使用短DNA杆,通过交流电位在微电极上电动.
- 通过光能量转移测量实时切换动态.
- 通过DNA杆的时间解析运动分析检测蛋白质与表面结的连接体结合.
主要成果:
- 成功量化了结合动力学 (k 启动,k 关闭),分离常数 (pM 模式中的 K D) 和竞争性结合效应 (EC 50).
- 证明了switchSENSE能够揭示激情效应并根据结合部位区分分析物的能力.
- 量化了六种西丁标记蛋白与三-酸酸 (NTA(3) 配体的相互作用,显示了动力学和近似性的变化,高达两级.
结论:
- 交换SENSE方法提供了一个强大的,无标签的平台,用于实时分析分子相互作用.
- 这项研究强调了单个蛋白质化学环境对His(6) -NTA(3) 相互作用的显著影响.
- switchSENSE提供了一种多功能工具,用于以高灵敏度和分辨率对绑定事件进行表征.
相关概念视频
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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen. Enzyme-substrate reaction allows the antigen to be visualized or quantified.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen. Enzyme-substrate reaction allows the antigen to be visualized or quantified.
01:22Protein-Drug Binding: Determination Methods
Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...