在SH3域中,结定向和序列特异性的结构决定因素
W A Lim1, F M Richards, R O Fox
1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520-8114.
Nature
|November 24, 1994
概括
SEM-5蛋白质的Src-homology-3 (SH3) 域以一种新的方向与Sos结合,与之前观察到的模式相反. 这种双模式结合机制对于涉及SH3域的通路中的信号特异性至关重要.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 细胞信号传递 细胞信号传递
背景情况:
- Src-homology-3 (SH3) 域对于将受体氨酸激酶激活与Ras激活联系起来至关重要.
- SEM-5,Grb2和Drk是保存的SH3域蛋白质,参与信号传导.
- 这些SH3域在Sos中结合了富含proline的序列,Sos是一种核酸交换因子.
研究的目的:
- 确定 SEM-5 碳氧终端 SH3 域的晶体结构,并复合了由 Sos 衍生的.
- 阐明SH3-相互作用的结合方向和机制.
- 了解新型绑定模式对信号特异性的影响.
主要方法:
- 使用X射线晶体学以2.0A分辨率确定结构.
- 这项研究涉及将SEM-5 SH3域与mSos衍生的氨基酸序列 (PPPVPPRRR) 复杂化.
- 进行了结构分析和与现有的SH3复合体进行比较.
主要成果:
- 晶体结构显示,Sos与SEM-5 SH3域以"负"方向结合.
- 这种结合方向与之前在其他SH3复合体中观察到的"加"方向正好相反.
- 在SH3域上保存的结合面可以容纳不同方向的.
结论:
- SEM-5 SH3域表现出一种新的双模式结合能力.
- 结合方向的这种灵活性对于在SH3介导路径中实现信号特异性至关重要.
- 这些发现提供了对SH3域识别多种proline丰富序列的结构基础的见解.
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