具有附加ATCUN动图的蛋白质的结构特征通过对磁性放松增强NMR光谱学
L W Donaldson1, N R Skrynnikov, W Y Choy
1Department of Medical Genetics, University of Toronto, Toronto, ON, Canada, M5S 1A8.
Journal of the American Chemical Society
|October 5, 2001
概括
一种新型的铜II结合基因 (ATCUN) 允许使用核磁共振 (NMR) 光谱学进行远距离限制. 这种方法有助于提炼蛋白质结构,正如ubiquitin所示.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 生物物理学的生物物理.
背景情况:
- 核磁共振 (NMR) 光谱对于确定蛋白质结构至关重要.
- 在基于NMR的结构生物学中,提取远程距离限制仍然是一个挑战.
研究的目的:
- 引入一种使用放松增强NMR光谱法获得远程距离限制的新方法.
- 为了利用ATCUN图案用于Cu(2+) 结合和随后的距离测量.
主要方法:
- 采用一个短的,三个残留的铜 (II) 结合序列 (ATCUN动图) 附加到蛋白质上.
- 测量胺质子在存在或不存在Cu2+时的放松率.
- 将放松率转换为距离限制,使用中枢神经系统程序中的PMAG例程进行结构计算.
主要成果:
- 证明了ATCUN图案方法的实用性,使用ATCUN标记的ubiquitin.
- 基于X射线结构,在实验测量和理论计算的放松率之间取得了很好的一致性.
结论:
- 通过NMR光谱,ATCUN图案提供了一种有效的策略,用于通过NMR光谱生成远程距离限制.
- 这种方法有助于精确的蛋白质结构提炼,得到了ubiquitin研究的验证.
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