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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.6K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.6K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

1.4K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
1.4K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.7K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.7K
Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

3.1K
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
3.1K
¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

1.3K
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
1.3K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.4K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.4K

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関連する実験動画

Updated: Jan 3, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

15.9K

DNP強化メチル固体NMRスペクトルによるタンパク質構造の探索

Jiafei Mao1,2, Victoria Aladin2,3,4, Xinsheng Jin5

  • 1Institute of Biophysical Chemistry , Goethe University Frankfurt , 60438 Frankfurt am Main , Germany.

Journal of the American Chemical Society
|November 23, 2019
PubMed
まとめ
この要約は機械生成です。

この研究では,ダイナミック・ニュークレア・ポラライゼーション (DNP) 強化固体NMR (ssNMR) を使用したタンパク質構造分析のための新しいメチルベースのツールキットが導入されています. この方法は,メチル群をセンサーと"NMR トーチ"として使用して,タンパク質の包装とリガンド結合部位を明らかにします.

さらに関連する動画

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

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Last Updated: Jan 3, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

15.9K
Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
09:37

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

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科学分野:

  • バイオ物理学
  • 構造生物学
  • スペクトロスコーピー

背景:

  • ダイナミックな核極化 (DNP) は,固体NMR (ssNMR) の感度を大幅に高め,より広範なアプリケーションを可能にします.
  • 複雑な生物系におけるDNP-ssNMRを完全に活用するには,さらなる方法論的進歩が不可欠です.
  • 既存の ssNMR 方法は,特定の分子環境と短距離構造情報を検知する上で限界があります.

研究 の 目的:

  • DNP-ssNMRを用いたタンパク質構造の決定のための新しいメチルベースのツールキットを開発する.
  • メチル群を動的センサーと"NMRトーチ"としてタンパク質の構造と機能を探知するために利用する.
  • 膜タンパク質のような大きな生物分子を調査するためのssNMRの能力を拡張する.

主な方法:

  • 異核オーバーハウザー効果 (hetNOE) と炭素-炭素スピン拡散 (SD) との信号強化のためのDNPの統合.
  • メチル群からの情報を最大化するために,同位体ラベリングスキームの戦略的設計.
  • サブナノメートルの距離を検知するためのC−13スピン拡散の適用.

主要な成果:

  • メチルグループは,局所的な分子包装を効果的に探知し,リガンド結合ポケットなどの特定の領域を照らすために"NMRトーチ"として機能します.
  • C-Cスピン拡散法では,従来のssNMRとEPRスペクトロスコーピーの解像度のギャップを埋める.
  • 緑色プロテオロドプシン (GPR) の大きな膜タンパク質への適用性が実証され,その光サイクルメカニズムに関する洞察を提供した.

結論:

  • 開発されたメチルベースのDNP-ssNMRツールキットは,タンパク質構造とダイナミクス分析のための強力な新しいアプローチを提供します.
  • メチル群はタンパク質の構造と 機能的な部位を理解するための 多用途の探査機です
  • この方法論は,膜タンパク質を含む,大きく複雑な生物学的システムの研究を強化します.