通过Src SH3域通过β-arrestin 1介导的Src激活,由冷电子显微镜揭示
Natalia Pakharukova1,2, Brittany N Thomas1,2, Harsh Bansia3
1Department of Medicine, Duke University Medical Center; Durham, NC 27710, USA.
bioRxiv : the preprint server for biology
|August 12, 2024
概括
β-arrestins (βarrs) 通过与其 SH3 域结合激活Src 激酶,将其取代并可能改变受体信号传递. 这项研究揭示了beta-arrestin-Src相互作用的结构基础.
科学领域:
- 分子和细胞生物学分子和细胞生物学
- 结构生物学 结构生物学
- 信号传输 信号传输
背景情况:
- β-arrestins (βarrs) 在G蛋白合受体 (GPCR) 信号传输中至关重要,作为传感器.
- 贝尔与下游效应因子 (如酶) 相互作用和调节的精确机制在很大程度上是未知的.
- 了解这些相互作用是解读复杂细胞信号通路的关键.
研究的目的:
- 阐明beta-arrestin 1 (βarr1) 招募和激活非受体氨酸激酶 Src. 的结构基础.
- 为了研究βarr1和Src SH3域之间的分子相互作用.
- 了解这些相互作用如何影响Src活性和潜在的GPCR信号传递.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定βarr1-Src复合物的高分辨率结构.
- 结构分析的重点是确定βarr1和Src SH3域之间的结合接口.
- 这项研究检查了Src结合时在βarr1中诱导的构造变化.
主要成果:
- βarr1通过两个不同的位点与Src SH3域结合:N-domain中的一个多烯基基基因和中央顶区域的非烯基基位点.
- βarr1与SH3域的芳香表面相互作用,这对Src自身抑制至关重要,表明通过SH3域位移激活.
- 将Src SH3与βarr1的中央区域结合,诱导βarr1的结构重组,可能影响其与GPCRs的相互作用.
结论:
- 通过特定的结合相互作用,βarr1通过取代其自身抑制的SH3域来激活Src.
- 在Src结合时,βarr1中发现的结构重组可能会影响受体脱敏和下游信号通路.
- 这项研究提供了关键的结构洞察力,了解β-arrestins对Src激酶的调节.
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