用横向放松优化的脉冲场梯度NMR测量的大分子组合的转化扩散
Reto Horst1, Arthur L Horwich, Kurt Wüthrich
1Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Journal of the American Chemical Society
|September 17, 2011
概括
这项研究引入了用于测量宏分子扩散的新型脉冲场梯度核磁共振 (NMR) 实验. 这些方法为结构生物学解决方案中分子大小和行为提供了精确的表征.
科学领域:
- 结构生物学 结构生物学
- 生物物理化学 生物物理化学
- 宏分子NMR光谱学 宏分子NMR光谱
背景情况:
- 脉冲场梯度 (PFG) NMR光谱对于在原始溶液条件下表征宏分子大小和水力动力学参数具有优势.
- 目前用于扩散测量的NMR技术在不同分子大小的应用上可能受到限制.
研究的目的:
- 开发和验证先进的NMR实验,用于研究溶液中的宏分子的转化扩散.
- 将新型横向放松优化 (TRO) 实验与传统方法的性能进行比较.
主要方法:
- 开发两个 (15) N过的 PFG刺激回声 (STE) 实验: (1) H-TRO-STE 和 (15) N-TRO-STE,其中包括CRINEPT和TROSY元素.
- 系统地比较这些TRO实验与传统的 (15) N过的STE,使用大肠杆菌外膜蛋白X (OmpX) 和Fos-10洗剂的混合小粒.
- 应用 (15) N-TRO-STE 实验来评估 Thermus thermophilus chaperonin GroEL (800 kDa) 在一个温度范围内的结构完整性.
主要成果:
- (1) H-TRO-STE和 (15) N-TRO-STE实验为评估各种分子大小的扩散测量提供了一个强大的平台.
- 证明了 (15) N-TRO-STE 对研究大型宏分子复合物的实用性,显示了GroEL在25-60°C的四度摄像头结构的保存.
结论:
- 开发的TRO-STE NMR实验增强了在结构生物学中表征宏分子转化扩散的能力.
- 这些方法有助于在生理学上相关的条件下研究分子行为和结构完整性.
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