一种新的双价相互作用模式是Pin1介导蛋白激酶C调节的非催化机制的基础
Xiao-Ru Chen1, Karuna Dixit1, Yuan Yang1
1Department of Biochemistry & Biophysics, Texas A&M University, College Station, United States.
eLife
|April 30, 2024
概括
Pin1调节蛋白激酶C (PKC) 的活性,不是通过异构化,而是通过与其C端尾部结合. 这种非催化相互作用揭示了调节AGC激酶的新机制.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 酸丁酸 (4,5) - 双酸盐的水解产生了控制细胞信号的第二信使.
- 蛋白激酶C (PKC) 酶是这些信号通路中的关键介质.
- 已知Pin1,一种基基异构酶,通过蛋白质体降解来调节PKC活性.
研究的目的:
- 研究Pin1调节常规PKC异型的机制.
- 阐明Pin1-PKC相互作用的结构基础.
- 探索Pin1在酶调节中的非催化作用.
主要方法:
- 进行X射线晶体学以确定Pin1的结构与PKCβII C-终端尾部复合.
- 结合测试以表征Pin1-PKC相互作用.
- 基于细胞的实验,以在细胞环境中验证发现.
主要成果:
- 皮恩1通过正规的cis-trans同质化不调节PKCα和PKCβII.
- Pin1 作为一个结合性合作伙伴,隔离 PKCβII 的 C 终端尾部.
- 观察到一种新的双价相互作用模式,Pin1使用WW和PPIase域绑定酸化PKC基因 (转向和疏水基因).
- 疏水性图案代表了一个非正规的Pin1交互元素.
结论:
- Pin1通过非催化机制调节PKC活动,挑战现有模型.
- Pin1与PKC的C端尾部的双价相互作用控制着激酶活性.
- 非催化Pin1功能代表了对AGC激酶和其他酶的低估的调节机制.
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