通过阿尔茨海默氏症的粉样β胺的多形铜协调
Simon C Drew1, Christopher J Noble, Colin L Masters
1Department of Pathology, The University of Melbourne, Victoria 3010, Australia. sdrew@unimelb.edu.au
Journal of the American Chemical Society
|January 6, 2009
概括
这项研究揭示了在生理pH值下粉样β (Abeta) 中的两个不同的Cu2+) 协调模式,澄清了阿尔茨海默病病原体中的铜结合. 这些发现解决了铜-阿贝塔相互作用的相互矛盾模型.
科学领域:
- 生物物理化学 生物物理化学
- 金属蛋白化学 金属蛋白化学
- 神经科学是一个神经科学.
背景情况:
- 阿尔茨海默病与粉样β (Abeta) 有关.
- 阿贝塔的Cu2+) 协调环境的了解很少,有许多相互矛盾的模型.
- 了解Cu2+) -阿贝塔相互作用对于阿尔茨海默病研究至关重要.
研究的目的:
- 直接解决阿贝塔中的Cu(2+) 协调环境.
- 要区分拟议的Cu(2+) 与Abeta结合的模型.
- 阐明特定氨基酸残留在铜协调中的作用.
主要方法:
- 多频连续波电子偏磁共振 (CW-EPR) 光谱.
- 阿贝塔的特定地点 (15) N 和 (13) C 标签.
- 超高精度共振和超高精度次级相关性 (HYSCORE) 光谱学的数值模拟.
主要成果:
- 在pH 6-7时,确定了两个不同的3N1O Cu2+) 协调模式 (O,N,E,H6,N,H13) 和 (D1,O,N,E,H6,N,E,H14)).
- 第三个3N1O协调模式涉及His6,His13和His14,在pH 8.0下观察到.
- 证实Tyr10的氧不是生理pH范围内的关键配体.
- Asp1碳酸氧被确定为主要协调模式中的赤道配体.
结论:
- 该研究直接解决了Abeta中的Cu(2+) 配体相互作用,确定了两个主要的协调模式.
- 这些发现为Cu2+/Abeta相互作用的复杂性提供了关键的见解.
- 这些结果有助于解决关于铜与Abeta结合的长期文学含糊性.
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