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相关概念视频

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.5K
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...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.0K
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...
3.0K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.6K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.6K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.4K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.4K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.3K
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...
1.3K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.7K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.7K

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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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通过基于标量合的固态NMR实验来表征内在无序的区域.

Tong Zeng1, Juan Li1, Chaowei Shi2

  • 1MOE Key Lab for Cellular Dynamics, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230022, China.

Biophysics reports
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概括

异常的粉样纤维素,与神经退行性疾病有关,具有刚性核心和混乱的模糊外套. 新的固态核磁共振方法使得粉样纤维中的这些内在无序区域 (IDR) 的结构特征化成为可能.

关键词:
粉样纤维素是粉样纤维素的组成部分.这是一个IDR IDR.在INEPT中,我们可以看到.尺度合器的合方式固态NMR是一种固态NMR.

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科学领域:

  • 生物化学 生物化学
  • 神经科学是一个神经科学.
  • 结构生物学 结构生物学

背景情况:

  • 异常的粉样纤维素是神经退行性疾病的标志,导致神经炎症和神经元死亡.
  • 粉样纤维素具有刚性横向β板芯和周围的"模糊外套"的内在无序区域 (IDR).
  • 刚性核心的结构特征是先进的,但混乱的IDR仍然具有挑战性.

研究的目的:

  • 应用先进的固态核磁共振技术,用于粉样纤维中的IDR的骨干赋值.
  • 为了阐明IDR在带结合过程中的结构动态.
  • 为了更好地理解粉样纤维的结构-功能关系在疾病.

主要方法:

  • 使用了二维 (2D) 异质核单量子连贯性 (HSQC) 和三维 (3D) HNCO,HNCA和HN(CO) CA光谱.
  • 采用了基于标量合的1H检测魔法角度旋转 (MAS) ssNMR技术.
  • 专注于粉样纤维内内在无序区域 (IDR) 的骨干分配.

主要成果:

  • 成功地应用了2D和3DssNMR技术用于IDR骨干分配.
  • 证明了在粉样纤维中表征无序蛋白质构造的可行性.
  • 建立了研究IDR对联体相互作用的构造变化的基础.

结论:

  • 先进的ssNMR方法为粉样纤维中的IDR结构提供了关键的见解.
  • 这种方法有助于研究与神经退行性疾病机制相关的形状变化.
  • 允许进一步调查IDR在粉样纤维素功能和连接体相互作用中的作用.