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Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
Published on: July 25, 2013
蛋白质 - 连接体相互作用中的形状约束的热力学和结构效应. 与连接体预组织相关的热悖论
John E DeLorbe1, John H Clements, Martin G Teresk
1Department of Chemistry and Biochemistry, The Institute of Cellular and Molecular Biology, University of Texas, Austin, Texas 78712, USA.
Journal of the American Chemical Society
|November 6, 2009
概括
与常见假设相反,Grb2 SH2域相互作用中的配体预组织并没有改善结合. 预先组织的连接体中有利的结合率导致了 affinity 的增加,突出了预测蛋白质-连接体相互作用的复杂性.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子相互作用 分子相互作用
背景情况:
- Grb2 SH2 域在信号传导途径中起着至关重要的作用.
- 了解蛋白质-连接体相互作用是药物发现和分子生物学的关键.
- 由SH2域结合的铁 (pY) 是一个关键的调节机制.
研究的目的:
- 调查连接体预组织如何影响与Grb2 SH2域结合的能量和结构.
- 为了明确确定改变pY+1残留物对结合的影响.
- 挑战常见的假设,即连接体预组织总是产生的优势.
主要方法:
- 将酸盐和环烯衍生的酸 (pY) 替代物纳入 Grb2 SH2 结合联体.
- 使用异热定位热量计 (ITC) 的热力学分析.
- 使用X射线晶体学进行结构分析.
主要成果:
- 所有的配体都表现出有利的结合度.
- 结合对具有疏水性pY+1残留的配体有利,但对具有疏水性残留的配体不利.
- 预先组织的连接体显示出更有利的吉布斯能量,这是由于增强的结合,而不是.
- 与灵活的对照相比,受约束的配体意外地具有不利的结合.
- 结晶学揭示了受约束的连接体复合体中更多的直接极性接触,以及灵活的连接体复合体中更多的水介导接触.
结论:
- 配体预组织不一定在 Grb2 SH2 域结合中赋予的优势.
- 有利的结合度,而不是度,可以在预先组织的连接体中增加亲和力.
- 该研究揭示了在预测改变蛋白相互作用的连接物结构的热力学和结构后果方面存在显著的复杂性.
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