在突触囊泡集群中,可溶性内细胞蛋白的细分通过相位分离
Tomofumi Yoshida1, Koh-Ichiro Takenaka1, Hirokazu Sakamoto2
1Laboratory of Neural Membrane Biology, Graduate School of Brain Science, Doshisha University, Kyoto 610-0394, Japan.
iScience
|May 30, 2023
概括
恩多菲林A1 (EndoA1) 蛋白在神经末端形成类似液体的集群,将其他蛋白质招募到突触囊泡集群中. 这一由液态-液态相分离 (LLPS) 驱动的过程对于神经传递至关重要.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 突触囊泡 (SV) 集群对于神经传递至关重要,并被认为是通过液体-液体相分离 (LLPS) 形成的,这种分离由突触素介导.
- 细胞内附加蛋白质在这些SV中积聚的机制尚不清楚.
研究的目的:
- 调查内啡林A1 (EndoA1) 在突触囊泡集群的形成和组成中的作用.
- 确定EndoA1是否经历了LLPS,并有助于突触前终端的结构组织.
主要方法:
- 在前突触终端中EndoA1的异质表达.
- 孔焦显微镜可视化蛋白质定位和凝结物形成.
- 生物化学测试以评估蛋白质的招募和相互作用.
主要成果:
- 内素A1 (EndoA1) 在前突触终端的生理相关度下经历液体-液体相分离 (LLPS).
- 外源表达的EndoA1促进突触素凝聚物形成,并积聚在类似SV的集群中.
- 恩多A1凝聚剂将关键的内细胞蛋白 (动氨酸1,安菲菲辛,交叉蛋白1) 招募到 SV 中,这种功能不是单独由突触素来执行的.
- 在培养的神经元中,EndoA1在SV集群中表现出活动依赖的分散和重组,反映了突触素的行为.
结论:
- 内分蛋白A1 (EndoA1) 在突触囊泡集群中具有结构性作用,超出其在内分细胞中已知的功能.
- EndoA1 的液体-液体相分离 (LLPS) 能力驱动动动力 SV 集群中各种内细胞蛋白质的积累.
- 这种LLPS介导的机制与突触素一起,有助于突触前终端的结构组织和功能.
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