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, Fang Mei1, Wei Lin1
1Department of Integrative Biology and Pharmacology, The University of Texas Health Science Center, Houston, Texas, USA; Texas Therapeutics Institute, The Brown Foundation Institute of Molecular Medicine for the Prevention of Human Diseases, The University of Texas Health Science Center, Houston, Texas, USA.
The Journal of biological chemistry
|May 24, 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影响EPAC1影响
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 1直接激活的交换蛋白 (EPAC1) 是一个关键的细胞内cAMP受体,参与维持细胞平衡.
- EPAC1的动态定位和与各种合作伙伴的相互作用对其多样化的细胞功能至关重要.
- EPAC1的SUMO相互作用动机 (SIM) 在其亚细胞向和信号传递中的结构和功能意义仍未得到充分探索.
研究的目的:
- 研究SUMO相互作用基因 (SIM) 在EPAC1.1.的亚细胞局部化和细胞功能中的作用.
- 阐明EPAC1与RanBP2/核素358相互作用的结构基础及其对EPAC1信号的影响.
- 了解SIM介导的相互作用如何影响EPAC1的cAMP结合亲和力和下游效应器激活.
主要方法:
- 使用突变分析来破坏EPAC1 SIM.
- 通过生物化学测试,研究了EPAC1与RanBP2/核素358的关联.
- 评估了SIM突变对EPAC1激活Rap1/Rap2GTPases,核凝聚物形成和细胞SUMOylation的影响.
主要成果:
- 在核孔复合体中,SIM对于EPAC1与RanBP2/核素358的关联至关重要.
- 破坏EPAC1 SIM会损害其激活正规效应器 (Rap1/Rap2) 和非正规功能 (核凝聚物,SUMOylation) 的能力.
- 通过SIM将RanBP2与EPAC1结合,减弱EPAC1的cAMP结合亲和力,创建具有降低cAMP灵敏度的局部信号域.
结论:
- SIM是一个关键的结构元素,它调解EPAC1与核孔综合体的相互作用,并调节其信号输出.
- 在EPAC1的支架协会和cAMP结合之间的相互作用允许在应对细胞应激时空间调整cAMP灵敏度.
- 这些发现为EPAC1信号提供了新的结构洞察力,并强调SIM作为潜在的治疗目标.
相关概念视频
Coat Assembly and GTPases
3.6K
Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
3.6K
Rab Proteins
4.1K
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
4.1K
Assembly of Signaling Complexes
6.0K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
6.0K
GTPases and their Regulation
8.7K
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins,...
Large G-proteins,...
8.7K
Rab Cascades
2.7K
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
2.7K
Directing Proteins to the Rough Endoplasmic Reticulum
8.7K
The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
8.7K


