对阿波和金属化三链卷的结构比较澄清了含有设计的硫酸盐中的金属结合决定因素
Saumen Chakraborty1, Debra S Touw, Anna F A Peacock
1Department of Chemistry and Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, USA.
Journal of the American Chemical Society
|September 10, 2010
概括
这项研究介绍了设计的X射线结构,揭示了重金属结合点的洞察力. 这些发现为工程蛋白质中的重金属相互作用制定了一般规则.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 蛋白质设计 蛋白质设计
背景情况:
- 设计的金属对金属化学具有前景,但缺乏结构数据.
- 很少有研究报告金属或非金属的结构特征.
- 没有先前的工作通过X射线晶体学定义了apo和金属化结构.
研究的目的:
- 为了呈现新设计的卷状线圈的X射线结构,CSL9C和CSL19C,在他们的非金属形式.
- 了解用于差异金属结合的"a"和"d"位点之间的结构差异.
- 制定设计蛋白质中重金属与氨酸丰富部位的结合的一般规则.
主要方法:
- 在非金属形式的两个设计 (CSL9C和CSL19C) 的X射线晶体学.
- 使用 heptad重复的平行三链绕线圈的 De novo 设计.
- 在特定位置 (9或19) 修改白氨酸残留物为氨酸,以创建富含醇的口袋.
主要成果:
- CSL9C和CSL19C的X射线结构分别以1.36和2.15 Å的分辨率确定.
- CSL9C 半氨酸侧链显示金属结合的预组织,而 CSL19C 半氨酸在结构上是均的.
- 确定了设计中的金属结合的差异性光谱行为的结构基础.
结论:
- 阿波结构为了解金属化后的金属现场组织变化提供了基础.
- 制定了设计蛋白质中重金属与氨酸丰富部位的结合的一般规则.
- 这些发现可能有助于了解金属和金属调节蛋白中的重金属相互作用.
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