在指蛋白中减去蛋白质折叠的能量成本,使用设计的金属
Amit R Reddi1, Tabitha R Guzman, Robert M Breece
1Department of Chemistry, Columbia University, New York, NY 10027, USA.
Journal of the American Chemical Society
|October 2, 2007
概括
指蛋白在结构和功能上使用 (II) 离子. 这项研究量化了 (II) 结合热力学与不同协调位点的关系,揭示了对蛋白质折叠和稳定性至关重要的驱动复合.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 生物有机化学 生物有机化学
背景情况:
- 指蛋白是人类金属蛋白中最大的一类.
- 结合Zn(II) 诱导蛋白质折叠,这对于生物活动至关重要.
- 由于合相互作用,在不同位点的Zn(II) 协调的热力学知之甚少.
研究的目的:
- 为了确定Zn(II) 与Cys4,Cys3His1和Cys2His2连接体组结合的热力学.
- 量化Zn(II) 对蛋白质折叠和稳定性的贡献.
- 了解质子释放和力-力补偿在Zn (II) 结合中的作用.
主要方法:
- 使用非结构化的GGG基架来最大限度地减少蛋白质折叠效应.
- 采用计,电位计和热量计来研究Zn (II) 的结合.
- 确定Zn (II) - 连接物相互作用的形成常数和热力学参数.
主要成果:
- Zn(II) 复合是由驱动的,并通过质子释放来调节.
- 对于具有Cys4,Cys3His1和Cys2His2位点的Zn(II) -GGG的形成常数分别为5.6x10^16,1.5x10^15和2.5x10^13M^-1.
- Zn(II) 相互作用为蛋白质折叠和稳定提供了重要的驱动力,在生理pH值下,亲和力趋于一致.
结论:
- 对于研究的协调动机,GGG支架提供了接近最大的Zn(II) 亲和力.
- 对于蛋白质在各种指蛋白质上的折叠,Zn(II) 的结合能量被不同的方式利用.
- 了解这些热力学是阐明指蛋白结构-功能关系的关键.
相关概念视频
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