在VCP,一个重要的unfoldase和deubiquitinases之间有不同的合模式
bioRxiv : the preprint server for biology
|September 24, 2024
概括
这项研究揭示了蛋白质循环酶VCP如何与诸如VCPIP1之类的二维基因酶 (DUB) 协调在不同的部位. 这种协调对于管理无处不在的蛋白质,影响衰老和疾病至关重要.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 细胞生物学 细胞生物学
背景情况:
- 蛋白质静止对于细胞健康至关重要,涉及蛋白质降解和循环,与衰老和癌症和神经退行等疾病相关的错误.
- AAA+ ATPase VCP (含氨酸的蛋白质) 提取并展开无处不在的基质,而二维基因酶 (DUB) 则删除无处不在的标签.
- 在蛋白质循环中,VCP的机械展开和DUBs在蛋白质循环中的酶活性之间的协调仍然不太清楚.
研究的目的:
- 研究活细胞中VCP和二维基因酶 (DUB) 之间的相互作用和协调机制.
- 识别与VCP结合的特定DUB,并描述它们的结合部位.
- 阐明VCP-VCPIP1复合体形成的结构基础和功能影响.
主要方法:
- 在活细胞中使用基于光化学的方法对VCP相互作用的全蛋白质组概况.
- 低温电子显微镜 (cryo-EM) 用于确定VCP-VCPIP1复合物的结构.
- 生物化学测试,包括突变发生和单分子质量光度,以验证功能相互作用.
主要成果:
- 确定了与VCP结合的DUBs,这些DUBs位于其中央孔的入口,出口或两个位置附近.
- 确定了VCP-VCPIP1复合体的高分辨率冷EM结构,揭示了与VCP六合体相互作用的多个VCPIP1原体.
- 表明VCPIP1在中孔的入口和出口点结合VCP,其二维基因酶域定位在展开后起作用,并且VCP刺激VCPIP1的活动.
结论:
- 脱基因酶 (DUB) 在不同的位置与VCP结合,影响基质加工.
- VCP-VCPIP1复合体的结构和功能数据显示,在基质展开后,存在协调的乌比奎去除机制.
- 了解这些酶协调机制,可以了解蛋白质稳定调节及其对人类疾病的影响.
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