通过14-3-3对PEAK3伪激酶支架的调节进行结构性洞察
Hayarpi Torosyan1,2, Michael D Paul1, Antoine Forget3,4
1Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, 94158, USA.
Nature communications
|June 19, 2023
概括
PEAK3伪基因酶二元化结合14-3-3蛋白质,形成一个独特的接口,调节细胞行为和癌症进展. 这种结构洞察力澄清了PEAK3脚手架及其相互作用.
科学领域:
- 分子生物学分子生物学
- 结构生物学是结构生物学.
- 癌症研究 癌症研究
背景情况:
- 皮克 (PEAK) 伪基因酶作为支架,通过二分化调节关键细胞过程.
- 在脚手架和蛋白质相互作用中PEAK二元化的精确作用仍然难以捉摸.
- 了解PEAK相互作用体复合体对于阐明它们在癌症进展中的作用至关重要.
研究的目的:
- 确定PEAK3二分化的结构基础及其与14-3-3蛋白的相互作用.
- 阐明PEAK3支架在调节细胞功能的机制性作用.
- 研究蛋白激酶D (PKD) 对PEAK3/14-3-3结合和PEAK3局部化的影响.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定与14-3-3结合的二维PEAK3的结构.
- 生物化学测定检查PEAK3/14-3-3由PKD.约束调节.
- 细胞局部化研究以评估PEAK3核缩.
主要成果:
- 冷-EM结构显示了二极体PEAK3与14-3-3异极体的不对称结合模式.
- 确定了一种新的二次相互作用接口,超出了正规的酸盐依赖相互作用.
- PKD调节PEAK3/14-3-3的结合;抑制导致PEAK3的核转位和改变的蛋白相互作用.
结论:
- PEAK3二元化为14-3-3结合创造了一个不寻常的二次接口.
- 这种相互作用促进了14-3-3介导的PEAK3局部化及其多样化的蛋白质相互作用的调节.
- 这些发现为PEAK3在细胞调节和癌症中的功能提供了结构和机制的见解.
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