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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
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...
1.3K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

995
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
995
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

3.3K
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.
3.3K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.5K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.5K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

1.2K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
1.2K
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

874
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...
874

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Updated: May 6, 2026

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

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パラマグネット性NMRによるマクロ分子結合における一時的な中間物質の検出

Junji Iwahara1, G Marius Clore

  • 1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.

Nature
|April 28, 2006
PubMed
まとめ
この要約は機械生成です。

研究者らは,分子間パラマグネティックリラクゼーションエンハンスメント (PRE) を使用して,マクロ分子結合における一時的な中間物質を検出しました. この方法は,転写因子が非同類のサイトと相互作用することによって,特定のDNAサイトをより速く発見する方法を明らかにします.

さらに関連する動画

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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

Published on: September 23, 2021

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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance
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科学分野:

  • バイオケミストリー バイオケミストリー
  • 分子生物学は分子生物学である.
  • 構造生物学 構造生物学とは

背景:

  • マクロ分子複合体の形成は,特異性とスピードのバランスをとります.
  • 結合運動の速度の向上は,検索の次元性や魅力的な可能性の減少を伴う可能性があります.
  • 暫定的で非特異的な結合中介物質は,運動的および理論的モデルによって示唆されています.

研究 の 目的:

  • 均衡状態下におけるマクロ分子結合における低集団の一時的な中間物質を直接検出し,特徴づけること.
  • 配列特異的な転写因子の結合率の向上における非特異的なDNA結合の役割を調査する.
  • 結合ダイナミクスを研究するために,分子間パラマグネティックリラクゼーションエンハンスメント (PRE) の有用性を実証する.

主な方法:

  • 暫定的な相互作用を調査するために,分子間パラマグネティックリラクゼーションエンハンスメント (PRE) を利用しました.
  • HOXD9ホメオドメイン転写因子のDNAへの結合を研究するためにPREを適用しました.
  • 中間構造とダイナミクスを特徴付けるために,高速交換体制でPREデータを分析しました.

主要な成果:

  • 転写因子-DNA結合中に直接検出される短期間,低集団の中間物質.
  • 非同性DNA部位で形成されるこれらの中間物質は,特定の複合体と構造的に類似していることが観察されました.
  • 分子内および分子間転位を含む2つの異なる検索メカニズムを特徴づけた.
  • 非特異的結合が特定のDNA関連の速度を高めることを実証した.

結論:

  • 分子間PREは,一時的結合中間物質の検出と特徴付けのための強力な技術です.
  • 転写因子は,特定の結合を加速するための検索戦略として,非特異的なDNA相互作用を利用します.
  • この方法論は,さまざまなマクロ分子結合プロセスに広く適用できます.