在Drosophila RTK Sevenless (dROS1) 和GPCR BOSS之间相互作用的结构基础
Jianan Zhang1,2, Yuko Tsutsui1,2, Hengyi Li1,2
1Department of Pharmacology, Yale University School of Medicine, New Haven, CT, 06520, USA.
Nature communications
|January 18, 2025
概括
七无蛋白 (dROS1) 结构揭示了它如何与BOSS结合,这是Drosophila眼睛发育的关键步骤. 这项研究澄清了受体氨酸激酶 (RTK) 相互作用,并为研究人类ROS1,一种瘤基因提供了信息.
科学领域:
- 发展生物学 发展生物学
- 结构生物学 结构生物学
- 分子细胞生物学 分子细胞生物学
背景情况:
- 七无 (dROS1) 是Drosophila受体氨酸激酶 (RTK),对于R7光受体的分化至关重要.
- dROS1的激活需要与GPCR BOSS.的细胞外区域 (ECR) 结合.
- 在此之前,dROS1-BOSS相互作用的结构基础是未知的.
研究的目的:
- 阐明dROS1细胞外区域及其连接体BOSS.之间的物理相互作用.
- 确定由BOSS.激活dROS1的结构基础.
- 提供与人类瘤发生相关的ROS1信号传递的机制性见解.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定dROS1 ECR的结构.
- -交换质谱法 (HDX-MS) 用于绘制结合表位.
- 针对位点的突变发生和AlphaFold复杂预测,以验证相互作用模型.
主要成果:
- dROS1 ECR采用了折叠的形状,由二硫化物接的螺旋式针头稳定.
- 特定的结合表位被确定为:dROS1的第三个Fibronectin type III (FNIII) 域中的β链和BOSS的ECR中的C终端.
- 相互作用涉及疏水接触和β-链增大.
结论:
- 这项研究揭示了dROS1-BOSS结合的结构机制,澄清了Drosophila发育中的关键步骤.
- 这些发现为人类ROS1瘤基因提供了机械洞察力,ROS1瘤基因是dROS1.1的同类基因.
- 这项工作为了解信号通路中的RTK-GPCR相互作用提供了基础.
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