SV2A-Syt1 interaction controls surface nanoclustering and access to recycling synaptic vesicles

SV2A-Syt1 interaction controls surface nanoclustering and access to recycling synaptic vesicles
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SV2A-Syt1相互作用控制表面纳米簇和回收突触囊泡

DOI:
10.1101/2021.12.08.471864
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发表时间:
2021
期刊:
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影响因子:
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通讯作者:
Small C
Small C
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Small C

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胞吐作用后,突触囊泡(SV)回收滞留在质膜上的囊泡蛋白对维持神经传递至关重要。纳米簇作为一种机制正在出现,通过这种机制,蛋白质可以在胞吞作用之前进行“预组装”,以确保随后几轮囊泡融合的高保真度。在这里,我们使用单分子成像来检查突触结合蛋白-1(Syt 1)和突触囊泡蛋白2A(SV 2A)的纳米簇。Syt 1通过其C2B结构域(K326/K328)与SV 2A的相互作用形成表面纳米簇,如通过突变Syt 1(K326 A/K328 A)和敲低内源性SV 2A所证明的。阻断与Syt 1(SV 2AT 84 A)的同源相互作用也会减少SV 2A聚集。受损的Syt 1和SV 2A的纳米簇导致加速的Syt 1的内吞作用,改变细胞内分选和减少Syt 1的Rab 5阳性内吞途径的运输。我们的结论是SV 2A和Syt 1之间的相互作用锁定两个分子到表面纳米团簇,控制它们进入回收SV。
Following exocytosis, the recapture of vesicular proteins stranded at the plasma membrane in recycling synaptic vesicles (SVs) is essential to sustain neurotransmission. Nanoclustering is emerging as a mechanism through which proteins may be ‘pre-assembled’ prior to endocytosis, to ensure high fidelity of retrieval for subsequent rounds of vesicle fusion. Here, we used single molecule imaging to examine the nanoclustering of synaptotagmin-1 (Syt1) and synaptic vesicle protein 2A (SV2A). Syt1 forms surface nanoclusters through interaction of its C2B domain (K326/K328) with SV2A, as demonstrated by mutating Syt1 (K326A/K328A) and knocking down endogenous SV2A. Blocking cognate interaction with Syt1 (SV2AT84A) also decreased SV2A clustering. Impaired nanoclustering of Syt1 and SV2A leads to accelerated endocytosis of Syt1, altered intracellular sorting and decreased trafficking of Syt1 to a Rab5-positive endocytic pathway. We conclude that the interaction between SV2A and Syt1 locks both molecules into surface nanoclusters, controlling their entry into recycling SVs.
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