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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Fluorescence detection methods for microfluidic droplet platforms
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用于单分子光谱的快速微流体双跳混合装置

Fabian Dingfelder1, Bengt Wunderlich1, Stephan Benke1

  • 1Department of Biochemistry, University of Zurich , Winterthurerstrasse 190, 8057 Zurich, Switzerland.

Journal of the American Chemical Society
|April 11, 2017
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概括

一个新的微流体装置使科学家能够研究快速的生物分子反应和短暂的状态. 这种方法增强了单分子光谱,用于探索复杂的蛋白质动态和相互作用.

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科学领域:

  • 生物物理
  • 化学动力学
  • 分子生物学

背景情况:

  • 研究快速生物分子动力学对于理解复杂的生物过程至关重要.
  • 现有的单分子方法在探测暂时被填充的中间体和不平衡动态方面存在局限性.
  • 聚焦单分子光谱是一种强大的工具,但需要增强混合能力以获得更快的动力学.

研究的目的:

  • 引入一种新的微流体双跳混合装置,用于高分辨率的运动研究.
  • 为了研究生物分子反应中的不平衡动态和过渡状态.
  • 展示该装置在研究复杂蛋白质折叠和构造变化的能力.

主要方法:

  • 开发和实施微流体双跳混合装置.
  • 使用共聚焦单分子光谱进行实时观察.
  • 使用该装置研究内在无序蛋白质的合折叠结合反应.
  • 分析大细胞分解孔形成毒素的结构变化.

主要成果:

  • 微流体装置成功地探测了从毫秒到分钟的生物分子动力学.
  • 观察到以前无法进入的中间体.
  • 研究了两种内在无序的蛋白质的结合折叠和结合.
  • 描述了细胞分解毒素的结构动态.

结论:

  • 微流体双跳混合装置是研究快速生物分子运动的可靠和强大的工具.
  • 这项技术扩大了单分子研究的可访问时间尺度和动态模式.
  • 这种方法为蛋白质折叠,结合和构造转变的机制提供了新的见解.