![Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59399.jpg&w=3840&q=50)
ゲドリニウムベースのNMRスピンリラクゼーション測定 バイオ分子近表面静電電位
Binhan Yu1, Nicolas Bolik-Coulon2,3,4, Atul K Rangadurai2,3,4,5
1Department of Biochemistry & Molecular Biology, Sealy Center for Structural Biology & Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555-1068, United States.
Journal of the American Chemical Society
|July 19, 2024
まとめ
新しいガドリニウム (Gd) ベースのNMR方法は,バイオ分子静電電位を正確に測定します. この技術は,既存の方法よりも利点があり,生物分子静電学の研究を広げています.
科学分野:
- 生物物理化学
- 構造生物学
- 核磁共振 (NMR) スペクトロスコーピー
背景:
- NMRスペクトル検査は,生物分子静電特性の決定に不可欠です.
- 酸化窒素コソルートを用いた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 (PREs) は,タンパク質と核酸の表面近くの有効な静電電位 (φENS) を測定する.
研究 の 目的:
- φENSを測定するためのガドリニウム (Gd) ベースの新しいNMR方法を導入する.
- このGdベースのメソッドの有用性を様々なバイオ分子システムで実証する.
主な方法:
- NMR実験で異なる純電荷を持つGdケラートを使用した.
- Gdコソルトによって誘発されたH核のPREを測定した.
- 検証のために様々な生物分子のシステムにこの方法を適用した.
主要な成果:
- Gdベースの方法は,高電荷のバイオ分子であっても,正確な φENS測定を可能にします.
- Gdケラートは,酸化感受性タンパク質とより大きなPREに適性を含む,窒素酸化物よりも優れている.
- コソルート濃度の減少は結合を最小限に抑え,近距離の改善は予測精度を高めます.
結論:
- 開発されたGdベースのNMRアプローチは,生物分子静電学的研究の範囲を拡大します.
- この方法は,バイオ分子における静電電位を調査するためのより汎用的で正確なツールを提供します.
関連する概念動画
01:28Atomic Nuclei: Types of Nuclear Relaxation
284
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...
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...
284
01:23Atomic Nuclei: Nuclear Relaxation Processes
644
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
644
01:25Applications Of NMR In Biology
3.7K
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.
3.7K
01:05Atomic Nuclei: Magnetic Resonance
644
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
644
01:08NMR Spectroscopy: Spin–Spin Coupling
1.3K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.3K