功能不对称的RAF激酶二元体的阿洛斯特激活
Jiancheng Hu1, Edward C Stites2, Haiyang Yu2
1Department of Pathology and Immunology, Washington University School of Medicine, 660 South Euclid, Box 8118, St. Louis, MO 63110, USA; Howard Hughes Medical Institute, Washington University School of Medicine, 660 South Euclid, Box 8118, St. Louis, MO 63110, USA.
RAF 激酶控制细胞生长,它们的激活涉及一个不对称的二元体,其中一个激酶激活另一个. 这个过程需要N-终端酸化,可以被改造成一个构成性活跃的突变物.
科学领域:
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
- 生物化学 生物化学
背景情况:
- RAF 激酶是细胞生长和增殖的关键调节者.
- 雷夫激酶激活机制,特别是二分化作用,尚未完全理解.
- 最近的研究强调了二聚化在RAF激酶激活中的重要性.
研究的目的:
- 为了阐明RAF激酶二次体内的功能不对称性.
- 确定RAF激酶激活的特定要求,包括酸化和二元化.
- 为了设计一个构成性活跃的RAF激酶突变体.
主要方法:
- 生物化学试验用于研究激酶活性和二元化.
- 局部定向突变发生,以调查N端酸化的作用.
- 计算建模以了解疏水性脊柱组合.
- 构成性活性的RAF激酶突变体的工程.
主要成果:
- RAF 激酶二元在功能上是不对称的,其中一个激酶激活另一个激酶.
- 激活器激酶的N终端酸化对于全osterically诱导受体激酶的cis-autophosphorylation至关重要.
- 设计了一种构成性活跃的RAF突变,独立于Ras,二分化和激活循环酸化.
- BRAF的构成性N-终端酸化使初始CRAF激活成为可能,而CRAF的N-终端酸化取决于MEK,表明一个反循环.
结论:
- 这项研究揭示了RAF激酶激活中的明显的序列步骤,导致了活性构造.
- 通过N端酸化的功能不对称性和全调节是RAF激活的关键.
- 了解这些机制可以区分BRAF和CRAF激活,并提供对激酶调节的见解.
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