相关实验视频

Updated: May 28, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

在一个内在无序的蛋白质SNAP-25中,多个结构状态使用循环二元化

Jarom S Sumsion¹, Samuel W Shumway², Tanner M Blocker¹

¹Department of Cell Biology & Physiology, Brigham Young University, Provo, Utah.

Biophysical journal

|February 9, 2025

概括

突触关联蛋白25 (SNAP-25) 异型表现出明显的结构变化,以应对环境条件. 这些发现表明SNAP-25可能会充当还氧化传感器来调节神经递质释放.

科学领域:

神经科学是一个神经科学.
分子生物学分子生物学
生物化学生物化学

背景情况:

突触相关蛋白25 (SNAP-25) 对于通过突触囊泡融合释放神经递质至关重要.
在核聚变过程中,SNAP-25为SNARE复合体贡献了两个α螺旋,从无序状态转变为有序状态.
对于SNAP-25异型 (A和B) 或它们的螺旋域 (SN1和SN2) 之间的结构差异知之甚少.

研究的目的:

描述SNAP-25A,SNAP-25B,SN1,SN2和一种无氨酸SNAP-25A变体的二次结构.
调查环境因素如何影响SNAP-25.5的结构转变.
阐明不同SNAP-25异型和域的功能意义.

主要方法:

循环二重化谱法用于分析二次结构.
质谱测量用于蛋白质的表征.
环境操纵 (离子强度,pH,温度,氧化还原状态) 以诱导结构变化.

主要成果:

在SNAP-25A和SNAP-25B中,有明显的结构转变.
SN1域比SN2域具有更大的结构变异性.
蛋白质结构对环境条件敏感,包括离子强度,pH值,温度和氧化还原状态.

结论:

SNAP-25是一种内在无序的蛋白质,对其细胞环境高度敏感.
SNAP-25异型和域的独特结构性质可能会调节神经递质释放.
在神经元细胞中,SNAP-25可能起到氧化还原传感器的作用.

更多相关视频

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Published on: July 16, 2017

Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments

Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments

Published on: November 1, 2024

相关概念视频

Protein Folding

Protein Folding

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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...

Intrinsically Disordered Proteins

Intrinsically Disordered Proteins

Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...