通过二维时间分辨率激光辅助NMR光谱检测内在无序蛋白质的表面可访问性
Jonghyuk Im1, Jongchan Lee1, Jung Ho Lee1,2
1Department of Chemistry, Seoul National University, Seoul 08826, Korea.
Journal of the American Chemical Society
|September 9, 2022
概括
一种新的2D时间分辨率的光CIDNP方法提供了超高分辨率用于分析内在无序蛋白质 (IDP) 构造. 这项技术揭示了如何压缩α-synuclein
科学领域:
- 生物物理
- 蛋白质化学
- 光谱学
背景情况:
- 内在无序的蛋白质 (IDP) 缺乏稳定的结构,使得它们的结构分析具有挑战性.
- 蛋白质表面可访问性是理解IDP构造和动态的一个关键参数.
- 现有的探测表面可访问性方法在分辨率和适用性方面存在局限性.
研究的目的:
- 开发和验证一个新的二维 (2D) 时间解析的光核诱导核极化 (TR-CIDNP) 实验,用于高分辨率的IDP表面可访问性分析.
- 量化评估内部污染物中的单个残留物的表面可达性.
- 通过双价离子诱导α-synuclein (α-Syn) 的结构变化.
主要方法:
- 实施2DTR-CIDNP实验,使用脉冲拉伸,对13Cα进行带选择性脱,并同时应用射频和激光脉冲.
- 在超高分辨率下对IDP表面可访问性的定量分析.
- 与现有的蛋白质表面可访问性测量方法进行比较分析.
主要成果:
- 开发的2D TR-CIDNP方法为分析IDP结构提供了高分辨率的光谱.
- 使用中性 рибофлавин染料,观察到四种Tyrα-synuclein残留物的表面可达性几乎相同.
- 已证实二元酸会诱导C端区域的紧缩和α-synuclein的N端区域的释放.
结论:
- 新的2D TR-CIDNP技术是一种强大且经过验证的方法,用于高分辨率地探测IDP表面的可访问性.
- 这种方法对形状变化敏感,正如α-synuclein中阴离体诱导的结构变化所示.
- 照片CIDNP作为一个直角和独立的工具,用于研究与IDP结构动态相关的生物过程.
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