関連する実験動画
Updated: Jun 29, 2026

10:07
Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance
Published on: August 26, 2025
13C NMRのリラクゼーション分散からのリガンド結合のダイナミクスは,自然に豊富に存在する状態にある
John S Zintsmaster1, Brian D Wilson, Jeffrey W Peng
1Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, USA.
Journal of the American Chemical Society
|October 7, 2008
まとめ
Carr-Purcell-Meiboom-Gill (CPMG) 13Calpha NMRのリラクゼーション分散は,同位体ラベリングなしで受容体結合中のリガンドダイナミクスを測定する. この方法では,柔軟なリンガンド領域が明らかになり,複雑な形成と活動関係の理解に役立ちます.
科学分野:
- バイオフィジックス 生物物理学
- 化学生物学 化学生物学とは
- 構造生物学 構造生物学とは
背景:
- レセプター結合におけるリガンドダイナミクスを理解することは,薬剤の発見に不可欠です.
- リガンド分析のための同位体ラベル付けは,医薬品の環境ではしばしば非実用的です.
- 核磁共振 (NMR) スペクトロスコピーは,分子ダイナミクスに関する洞察を提供します.
研究 の 目的:
- カール・パーセル・メイブーム・ギル (CPMG) 13カルファ NMR リラクゼーション分散の利点をプロファイリングリガンドダイナミクスで実証する.
- 自然の13C豊富度での方法の適用性を検証するために.
- リガンド受容体相互作用における柔軟性-活性関係を確立する.
主な方法:
- CPMG 13Calpha NMRのリラクゼーション分散測定を用いて.
- 同位体ラベルを避けるために,天然の13Cの豊富さで実験を行う.
- 結合時にリガンド13カルファ核の化学シフト変調を分析する.
主要な成果:
- CPMG 13Calpha NMR分散は,受容体結合中のリガンドダイナミクスを効果的にプロファイルします.
- この方法は,複雑な形成に影響を与える柔軟なトルション角度 (psi,chi1) を成功裏に特定します.
- 既知の受容体構造がない場合でも,活性を証明した.
- フォスフォペプチドリガンドがPin1.1に結合することを研究するために適用されます.
結論:
- CPMG 13Calpha NMR リラクゼーション分散は,製薬研究におけるリガンドダイナミクスを研究するための実用的なツールです.
- このテクニックは,柔軟性-活動関係に関する貴重な洞察を提供します.
- 同位体濃縮や構造情報なしで,リガンド結合イベントの特徴づけを可能にします.
さらに関連する動画
関連する概念動画
Atomic Nuclei: Types of Nuclear Relaxation
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
¹³C NMR: ¹H–¹³C Decoupling
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
¹H NMR: Interpreting Distorted and Overlapping Signals
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 slanted or...
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 slanted or...
Carbon-13 (¹³C) NMR: Overview
Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
The Equilibrium Binding Constant and Binding Strength
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
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...

