14-3-3蛋白抑制CaMKK1通过阻断其最后两个C终端螺旋体的激酶活性部位来抑制CaMKK1
Olivia Petrvalska1,2, Karolina Honzejkova1, Nicola Koupilova1
1Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague, Czech Republic.
Protein science : a publication of the Protein Society
|October 10, 2023
概括
这项研究揭示了14-3-3蛋白与CaMKK1和CaMKK2.2的结合方式的结构差异. 这就解释了为什么14-3-3结合会抑制CaMKK1而不是CaMKK2,影响细胞过程.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- /卡尔莫杜林依赖蛋白激酶激酶 (CaMKK1和CaMKK2) 调节重要细胞功能,包括瘤发生和神经元可塑性.
- 酸化通过促进与14-3-3蛋白结合来抑制CaMKKs,但CaMKK1和CaMKK2之间的功能后果不同.
研究的目的:
- 在结构上描述CaMKK1:14-3-3和CaMKK2:14-3-3复合体.
- 阐明14-3-3蛋白质对CaMKK1和CaMKK2的差异调节的分子机制.
主要方法:
- 微角X射线散射 (SAXS) 是一种微角X射线散射技术.
- - (H/D) 交换与质谱学 (MS) 相结合.
- 光光谱学. 光光谱学.
主要成果:
- 复杂的形成抑制了Ca2+/CaM对CaMKK1和CaMKK2.2的结合.
- CaMKK1:14-3-3γ复合体表现出一个紧的,刚性的结构,抑制了激酶活性部位.
- 复合物CaMKK2:14-3-3具有较宽松,更灵活的结构,对催化活性的影响微不足道.
结论:
- 在CaMKK:14-3-3复合体中的结构差异解释了CaMKK1和CaMKK2的差异性抑制.
- 在CaMKK1的活性部位和14-3-3γ之间的相互作用为CaMKK1抑制提供了结构基础.
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