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相关概念视频

Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...
NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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快速-NMR:使用NMR光谱的功能注释选技术.

Kelly A Mercier1, Michael Baran, Viswanathan Ramanathan

  • 1Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.

Journal of the American Chemical Society
|November 23, 2006
PubMed
概括

一种新的FAST-NMR方法使用蛋白质-配体相互作用来确定未知的蛋白质的功能. 这种方法分析活跃部位以确定生物作用,即使没有序列相似性.

科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 化学生物学 化学生物学

背景情况:

  • 结构基因组学和蛋白质结构倡议 (PSI) 产生了许多蛋白质结构,由于缺乏序列或结构同质性,缺乏清晰的功能注释.
  • 赋予这些新型蛋白质功能对于理解生物通路和开发新疗法至关重要.

研究的目的:

  • 开发和演示一种高通量核磁共振 (NMR) 方法,称为FAST-NMR,用于注释未表征蛋白质的生物功能.
  • 为了利用蛋白质-连接体相互作用作为功能分配的基础,独立于全球序列或结构相似性.

主要方法:

  • 一种分层的NMR查方法,使用生物活性化合物的库来识别蛋白质-配体相互作用.
  • 通过整合NMR化学转移扰动数据 (识别连接体结合位) 与AutoDock蛋白-连接体对接来确定快速的共同结构.
  • 使用CPASS (蛋白活性位结构比较) 软件和数据库,将已识别的活性位与具有已知功能的蛋白质数据库进行比较.

主要成果:

  • FAST-NMR方法成功地通过分析它们的联结活性位点来确定未注释的蛋白质的潜在功能作用.
  • 该方法证明了它的有效性,使用 Staphylococcus aureus 的未注释蛋白质 SAV1430 作为测试案例.
  • 实验性NMR数据与计算对接和数据库比较的整合为功能注释提供了一个强大的方法.

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A New Straightforward Method for Lipophilicity (logP) Measurement using 19F NMR Spectroscopy
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Last Updated: Jul 12, 2026

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

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Published on: September 26, 2016

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements
08:54

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements

Published on: May 1, 2017

A New Straightforward Method for Lipophilicity (logP) Measurement using 19F NMR Spectroscopy
09:32

A New Straightforward Method for Lipophilicity (logP) Measurement using 19F NMR Spectroscopy

Published on: January 30, 2019

结论:

  • FAST-NMR提供了一种强大的高通量解决方案,用于将功能分配给从结构基因组学努力中出现的新型蛋白质.
  • 相似的功能与相似的活性位点和连接体结合相互作用相关的原则是正确的,即使对于具有全球结构分歧的蛋白质也是如此.
  • 这种方法显著提高了在缺乏传统同类学信息的情况下,对蛋白质组进行注释和理解蛋白质功能的能力.