氨酸核酸交换因子EPAC1中的SUMO相互作用动机对于亚细胞向和功能是必需的
Wenli Yang1,2, Fang Mei1,2, Wei Lin1,2
1Department of Integrative Biology and Pharmacology, The University of Texas Health Science Center, Houston, Texas, USA.
bioRxiv : the preprint server for biology
|July 14, 2025
概括
EPAC1中的SUMO相互作用基因 (SIM) 对其与核孔综合体的相互作用和cAMP信号的调节至关重要. 破坏SIM会损害EPAC1的功能.
科学领域:
- 分子细胞生物学 分子细胞生物学
- 信号传输 信号传输
- 结构生物学 结构生物学
背景情况:
- 由cAMP直接激活的交换蛋白 (EPAC1) 是一个多功能细胞内cAMP受体,参与细胞平衡.
- EPAC1动态定位到各种细胞区,与多种分子合作伙伴相互作用.
- 具体结构图案在EPAC1的局部化和功能中的作用尚未完全阐明.
研究的目的:
- 调查SUMO相互作用动机 (SIM) 在EPAC1.1.的亚细胞向和细胞功能中的作用.
- 了解SIM如何影响EPAC1与核波林的相互作用及其下游信号传输.
- 探索SIM突变对EPAC1正规和非正规细胞活动的影响.
主要方法:
- 使用突变分析来破坏EPAC1 SIM.
- 在核孔复合体 (NPC) 中研究了EPAC1与RanBP2/Nup358的关联.
- 评估了SIM突变对EPAC1的cAMP结合亲和力和效应器激活 (Rap1,Rap2) 的影响.
- 研究了EPAC1在核凝聚物形成和细胞SUMOylation中的作用.
主要成果:
- 在NPC,SIM对于EPAC1与RanBP2/Nup358的关联至关重要.
- 破坏EPAC1 SIM会影响其激活Rap1和Rap2的能力.
- SIM突变会影响EPAC1的非正规功能,包括核凝聚物形成和细胞SUMOylation.
- 与RanBP2/Nup358的EPAC1-SIM相互作用减弱了cAMP的结合亲和力,形成了局部信号微域,对cAMP的敏感性降低.
- 脚手架协会和cAMP结合之间的相互作用允许EPAC1在空间上调整其对压力刺激的敏感性.
结论:
- 该SIM是一个关键的结构元素,控制EPAC1的亚细胞定位,NPC关联和信号输出.
- 通过与NPC的相互作用,EPAC1的SIM介导了一种用于空间调节cAMP灵敏性的新机制.
- 这些发现提供了对EPAC1信号的结构性见解,并建议针对EPAC1.1的潜在治疗策略.
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