一个PDZ-RapGEF促进突触发育在C. 通过Rap/Rac信号通路进行elegans
bioRxiv : the preprint server for biology
|June 12, 2025
概括
PXF-1通过与RAP-1相互作用并激活RAC-2来调节神经末端发育,这对C. elegans运动神经元中突触形成至关重要.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 小G蛋白是神经终端发育的关键调节者.
- GTPase调节蛋白精细调节小G蛋白的活性.
- 在C. elegans中,PXF-1是一种GTPase调节蛋白,对胆固醇运动神经元功能至关重要.
研究的目的:
- 阐明PXF-1协调突触前终端发育的分子机制.
- 了解涉及PXF-1在突触形成中的信号通路.
主要方法:
- 研究了PXF-1在Caenorhabditis elegans中的作用.
- 分析了PXF-1,RAP-1,RAC-2和TIAM-1之间的相互作用.
- 在pxf-1突变体中评估RAC-2活性.
主要成果:
- 通过RAP-1,PXF-1促进突触发育.
- pxf-1突变体表现出降低RAC-2活性,这对胆固醇突触发育至关重要.
- RAC-2 作用于 RAP-1 的下游.
- RAP-1与TIAM-1进行物理相互作用,通过RAC-2将PXF-1连接到前突触性动因子细胞骨架.
结论:
- PXF-1通过涉及RAP-1和RAC-2的途径协调了前突触终端发育.
- 该RAP-1/TIAM-1复合体激活RAC-2,将PXF-1连接到actin细胞骨架.
- 这项研究揭示了小G蛋白信号传递在突触前发育中的复杂相互作用.
更多相关视频
11:20Osmotic Avoidance in Caenorhabditis elegans: Synaptic Function of Two Genes, Orthologues of Human NRXN1 and NLGN1, as Candidates for Autism
Published on: December 11, 2009
11.7K
18:01Paradigms for Pharmacological Characterization of C. elegans Synaptic Transmission Mutants
Published on: August 18, 2008
14.1K
相关概念视频
Rab Cascades
2.6K
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.
2.6K
Cell Polarization by Rho Proteins
2.7K
Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
2.7K
Small GTPases - Ras and Rho
3.9K
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
3.9K
Rab Proteins
3.9K
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...
3.9K
