在激活循环和c-终端的Palindromic光基因之间的一种异质交换机控制c-Src功能.
Hipólito Nicolás Cuesta-Hernández1, Julia Contreras1, Pablo Soriano-Maldonado1,2
1Kinases, Protein Phosphorylation and Cancer Group, Structural Biology Programme, Spanish National Cancer Research Center (CNIO), C/Melchor Fernández Almagro num. 3, 28029, Madrid, Spain.
Nature communications
|October 17, 2023
概括
在c-Src激酶中的自酸化涉及到Tyr 419和Tyr 530位点之间的切换. 这个过程调节了酶功能和基质相互作用,影响了与癌症相关的突变.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 自酸化对蛋白激酶调节至关重要,但其分子基础尚未完全理解.
- c-Src 激酶经历自酸化,影响其功能状态和相互作用.
研究的目的:
- 阐明控制c-Src自酸化的结构和分子机制.
- 为了研究特定的氨酸残留物 (Tyr 419和Tyr 530) 在c-Src调节中的作用.
- 了解c-Src自酸化如何影响其催化和非催化功能.
主要方法:
- 时间解析的动力学研究来分析酸化率.
- 用X射线晶体学可视化自酸化的中间状态.
- 对癌症相关的c-Src变异与改变的C-终端序列的分析.
主要成果:
- C端Tyr 530是一个缓慢的自酸化部位,具有分子间动力学.
- 激活循环Tyr 419的酸化速度更快,并通过cis-to-trans开关控制Tyr 530的酸化.
- 在Tyr 530附近的一种Palindromic基因激活了活性激酶,促进了分子间自酸化.
- C-终端缺失破坏了这种动机,损害了Tyr 530的自酸化,导致c-Src功能障碍.
结论:
- 在c-Src激活循环和C终端之间存在一个交叉连接,调节激酶活性和基质功能.
- 已识别的基因及其与活性激酶的相互作用对c-Src自酸化和功能至关重要.
- 这种调节机制的功能障碍,如在癌症变体中所见,突显了它在正常生理学和疾病中的重要性.
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