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替代拼接调节了在神经元发育中的Vps10p域受体SorCS2的适配蛋白结合,贩运和活性
Sune Skeldal1, Lasse Frank Voss1, Jonas Lende1
1Department of Biomedicine, Aarhus University, Aarhus C, Denmark.
The Journal of biological chemistry
|July 28, 2023
概括
这项研究揭示了八种SorCS2蛋白质异型,由四种拼接变体生成,可以差异调节神经元可塑性和贩运. 这些异构体与特定的运动蛋白相互作用,影响来自大脑的神经营养因子 (BDNF) 信号传递.
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:
- Vps10p受体SorCS2对于神经系统发育和来自大脑的神经营养因子 (BDNF) 信号传递至关重要.
- 索尔CS2的细胞内域 (ICD) 调节BDNF受体TrkB和神经递质受体的贩运.
- 控制 SorCS2 ICD 中介贩运的特定细胞机械和适应蛋白 (AP) 相互作用仍然不清楚.
研究的目的:
- 识别和描述人类SorCS2.2的拼接变体和蛋白质异型.
- 研究SorCS2变种与适应蛋白和运动蛋白的相互作用.
- 确定这些异构体如何影响SorCS2贩运和BDNF信号传递.
主要方法:
- 鉴定了四种不同于ICD图案的人类SorCS2拼接变体.
- 分析翻译后加工成单链或双链受体异型的分析.
- 酵母两种混合屏用于识别蛋白质-蛋白质相互作用.
- 使用SorCS2淘汰海马神经元的功能测试.
主要成果:
- 四种拼接变体产生八种SorCS2蛋白质异型,在组织和应激因素的反应中具有差异性表达.
- 缺乏氨酸残留的变体在淘汰神经元中挽救了BDNF诱导的分支.
- 缺乏酸性的变体与与克拉相关的APs (AP-1,AP-2,AP-3) 的相互作用增加.
- 所有变体都结合了dinein光链Tctex-type 3;酸性集群变体也结合了kinesin光链1.
- 拼接变种表现出明显的贩运特性和亚细胞局部化.
结论:
- 现存的8种功能性SorCS2异型,是通过差分拼接和加工产生的.
- 这些异构体具有与dynein光链Tctex-type 3和kinesin光链1的独特相互作用能力.
- 这种异型多样性使细胞类型特定的SorCS2流通和BDNF信号通路的调制成为可能.
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