通过电子喷射电离质谱测量监测自我分类:形成中间体和多线程伪素在自我组装过程中的错误纠正
Wei Jiang1, Andreas Schäfer, Parveen Choudhary Mohr
1Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany.
Journal of the American Chemical Society
|February 4, 2010
概括
这项研究表明,伪甲的组装速度与它们的稳定性不匹配,更稳定的结构的组装速度较慢. 纠正错误对于实现热力学控制的自我分类系统至关重要.
科学领域:
- 超分子化学 超分子化学
- 化学动力学 化学动力学
背景情况:
- 伪素是机械互锁的分子,在分子机器中具有潜在的应用.
- 了解热力学稳定性和动力学组合之间的相互作用对于设计复杂的自我排序系统至关重要.
研究的目的:
- 为了研究二进制伪素的热力学稳定性和轴交换动力学.
- 探索基于/皇冠以太结合基因的自我分类系统.
- 分析自组装过程中的动力和热力学控制.
主要方法:
- 质子核磁共振 ((1) H NMR) 光谱学.
- 质子核重复效应光谱学 ((1) H, ((1) H EXSY) NMR实验.
- 电子喷雾质谱 (ESI-MS) 与混合流微反应器相结合.
主要成果:
- 热力学稳定性和轴交换率没有相关性;大多数稳定的复合体是缓慢组装的.
- 自排序系统表现出动力学和热力学不匹配,导致不可避免的错误组装结构.
- 纠错步骤是必要的,以实现热力学控制的自我排序产品,可在第二个时间尺度上观察.
结论:
- 这项研究突出了自我排序系统的复杂动力行为,包括首选的组装路径和死胡同结构.
- 动力和热力学控制之间的不匹配需要精确分子组装的错误纠正机制.
- 在微型反应堆中使用ESI-MS实时监控可以同时识别中间体和产品.
相关概念视频
Peptide Identification Using Tandem Mass Spectrometry
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
Tandem Mass Spectrometry
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...


