超快速的MAS固态NMR允许在偏磁性金属蛋白中广泛检测13C和1H
Ivano Bertini1, Lyndon Emsley, Moreno Lelli
1Magnetic Resonance Center, CERM, University of Florence, Sesto Fiorentino, Italy. ivanobertini@cerm.unifi.it
Journal of the American Chemical Society
|April 2, 2010
概括
这项研究表明,可以观察和分配来自偏磁蛋白中的金属协调残留物中的固态核磁共振 (NMR) 信号. 这些发现使得使用最小样本量进行金属蛋白的详细结构分析成为可能.
科学领域:
- 生物物理化学 生物物理化学
- 结构生物学 结构生物学
- 固态核磁共振 (NMR) 光谱 固态核磁共振 (NMR) 光谱
背景情况:
- 在固态状态下研究偏磁性金属蛋白,由于信号扩大而存在挑战.
- 从金属协调残留物观察共振对于理解金属蛋白结构和功能至关重要.
研究的目的:
- 开发和应用先进的固态核磁共振技术,用于对磁性金属蛋白的高分辨率分析.
- 从直接协调金属中心的残留物中分配NMR共振,在一个高度对磁性蛋白质中.
主要方法:
- 在矩阵金属蛋白酶12 (CoMMP-12) 的用 (II) 替代的催化域上,利用60kHz的超快速魔角旋转 (MAS).
- 采用高磁场 (21.2 T) 和低功率辐射,利用偏磁中心的增强放松.
- 使用已知的晶体结构数据分析伪接触移位 (PCS).
主要成果:
- 从固态CoMMP-12中的金属协调残留物中成功观察并分配了碳-13 ((13) C) 和质子 (1H) 共振.
- 在非常短的时间内,用不到1毫克的样本实现了这些观测.
- 区分和测量PCS对轮班的贡献,提供结构洞察力,直到协调连接体.
结论:
- 展示了一种定制的固态NMR方法,用于研究偏磁性金属蛋白.
- 通过最小的样本,使金属蛋白活性位点的详细结构特征成为可能.
- 通过分析伪接触转移,揭示了结构信息.
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