category
bioRxiv
date
Feb 25, 2026
slug
status
Published
summary
发现Rab11通过调控不同膜运输轨迹和PI(4)P群体实现双向控制,揭示MyoV/Rbo与Nuf/Rab11FIP4/Fwd两类效应蛋白对突触货物水平的相反调控机制,阐明Rab11通过循环通量而非直接释放调控EV货物池的假说。
tags
基因编辑
蛋白质组学
type
Post
📄 原文题目
Distinct Rab11-associated membrane trafficking pathways bidirectionally control neuronal extracellular vesicle cargo traffic
🔗 原文链接
💡 AI 核心解读
发现Rab11通过调控不同膜运输轨迹和PI(4)P群体实现双向控制,揭示MyoV/Rbo与Nuf/Rab11FIP4/Fwd两类效应蛋白对突触货物水平的相反调控机制,阐明Rab11通过循环通量而非直接释放调控EV货物池的假说。
📝 英文原版摘要
Neuronal extracellular vesicles (EVs) are released from synapses, and play roles in cellular communication, proteostasis, and the spread of toxic proteins in disease. The small GTPase Rab11 is required to maintain a reservoir of EV cargoes at presynaptic terminals, but how its diverse effector proteins contribute to this function and where Rab11 acts in neurons remains unclear. Using Drosophila motor neurons as a model, we show that EV cargoes redistribute from synapses to axons and cell bodies in rab11 mutants, concomitant with reduced release from synapses. We conducted a directed genetic screen of Rab11-associated factors and found that they have distinct roles in EV trafficking. Tethering and sorting factors are required to maintain levels of presynaptic EV precursors, supporting the hypothesis that Rab11 regulates EV cargo pools through recycling flux rather than by directly mediating EV release. Unexpectedly, we found that different classes of Rab11-associated proteins have opposite functions: the motor protein MyoV and the PI4KIIIa component Rbo sustain cargo levels at synapses, while the motor adaptor Nuf/Rab11FIP4 and the PI4KIIIb homolog Fwd restrict cargo levels. Together, these results indicate that Rab11 regulates multiple distinct organelle transport trajectories and PI(4)P populations to direct EV cargoes toward different cellular fates.
- 作者:NotionNext
- 链接:https://tangly1024.com/article/31348bd6-1f96-818b-af1a-d573b5543936
- 声明:本文采用 CC BY-NC-SA 4.0 许可协议,转载请注明出处。
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