アニゾトロプ的集団運動は,結晶タンパク質の核スピン緩和に寄与する
Józef R Lewandowski1, Julien Sein, Martin Blackledge
1Université de Lyon, CNRS/ENS-Lyon/UCB-Lyon 1, Centre de RMN à Très Hauts Champs, 69100 Villeurbanne, France.
Journal of the American Chemical Society
|November 18, 2009
まとめ
結晶タンパク質におけるアニゾトロプ運動は,NMRのリラックス率に大きく影響する. ドメインの動きを含むことは,タンパク質のダイナミクスの正確な固体状態NMR分析に不可欠です.
科学分野:
- バイオフィジックス 生物物理学
- 構造生物学 構造生物学とは
- 核磁共振 (NMR) スペクトロスコピー
背景:
- タンパク質のダイナミクスは,生物学的機能に不可欠です.
- 固体NMRは,タンパク質のダイナミクスを研究するための強力な技術です.
- アニゾトロプ的運動は,NMRのリラックス率に影響を与える可能性があります.
研究 の 目的:
- 結晶タンパク質におけるNMRリラクゼーション率に対するアニゾトロピック集団運動の影響を計算するためのモデルを開発する.
- 小幅の変動が (15) Nのスピン・レッテック・リラクゼーション・レートに与える影響を調査する.
主な方法:
- アニゾトロプ的運動分析のための理論モデルの開発.
- モデルを結晶タンパク質システムに適用する.
- (15) N回転格子リラクゼーション率の計算.
主要な成果:
- 小幅の変動 (<10度) は,15Nのスピン・ラットレス・リラクゼーション・レートに大きく寄与する.
- このモデルは,アニゾトロプ的集団運動の影響を定量化しています.
結論:
- アニゾトロプ的集団運動は,結晶タンパク質のNMRのリラックス速度において重要な役割を果たします.
- ドメインの動きは,精度向上のために,タンパク質動態の固体状態NMR分析に組み込まれなければなりません.
関連する概念動画
Atomic Nuclei: Nuclear Relaxation Processes
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. This...
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...
Atomic Nuclei: Nuclear Spin State Overview
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Atomic Nuclei: Magnetic Resonance
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...
NMR Spectroscopy: Spin–Spin Coupling
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 in...
Atomic Nuclei: Nuclear Spin
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...


