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相关概念视频

High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

2.3K
The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

1.4K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.4K
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

5.3K
A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
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相关实验视频

Updated: Jan 14, 2026

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry

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来自HX-MS实验的现场解析的能量信息.

Chenlin Lu1, Malcolm L Wells1, Andrew Reckers1

  • 1Department of Biochemistry and Molecular Biophysics, Columbia University Irving Medical Center, New York, NY, USA.

Nature chemical biology
|October 17, 2025
PubMed
概括
此摘要是机器生成的。

PIGEON-FEATHER从HX-MS数据中分析了蛋白质动态,揭示了不同的酶组合和抑制剂结合. 这种方法解决了蛋白质进化和功能的长期问题.

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A Hydrogen-Deuterium Exchange Mass Spectrometry HDX-MS Platform for Investigating Peptide Biosynthetic Enzymes
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科学领域:

  • 生物物理学的生物物理.
  • 结构生物学 结构生物学
  • 计算生物学 计算生物学

背景情况:

  • 了解蛋白质构成组合对于功能至关重要,但在高分辨率下很难实现.
  • 现有的方法缺乏能够捕捉蛋白质动态中的微妙能量差异的分辨率.

研究的目的:

  • 介绍PIGEON-FEATHER,一种用于高分辨率分析蛋白质构成组合的新型计算方法.
  • 在单个氨基酸分辨率下使用交换质谱 (HX-MS) 数据计算组合自由开放能量 (∆Gop).

主要方法:

  • 开发了PIGEON-FEATHER,这是贝叶斯的蒙特卡洛采样方法.
  • 应用该方法重建各种大小的蛋白质的HX-MS同位素质量包裹.
  • 利用HX-MS数据分析蛋白质动态和组合能量.

主要成果:

  • 揭示了埃舍里希亚大肠杆菌和人类二水叶酸还原酶 (ecDHFR和hDHFR) 的独特进化途径和构造组合.
  • 解释了差异性抑制剂与ecDHFR和hDHFR的结合,解决了药物疗效的一个关键问题.
  • 在大肠杆菌的乳液抑制剂中映射了联结体诱导的整体重权,阐明了其转录调节机制.

结论:

  • 从HX-MS数据中,PIGEON-FEATHER提供了对蛋白质构造组合的高分辨率能量洞察.
  • 该方法阐明了蛋白质功能和药物反应差异的进化差异.
  • 毛为理解复杂的生物系统提供了强大的工具,包括蛋白质-DNA相互作用和转录调节.