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在氧化应激过程中,局部的K63泛素信号由VCP/p97调节
Austin O Maduka1, Sandhya Manohar2, Matthew W Foster3
1Department of Biology, Duke University, Durham, NC, 27708, USA.
bioRxiv : the preprint server for biology
|July 1, 2024
概括
氧化应激会导致与K63结合的乌比奎链在非细胞质区块中积聚. 这种无处不在的信号传递,与VCP和NPLOC4一起,对于细胞应激反应和蛋白质处理至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 压力反应应激反应
背景情况:
- 细胞激活分子机械,以在压力下生存.
- 在氧化应激期间,乌比基信号传递增加,调节蛋白质命运.
- 对于应激反应中的乌比奎的亚细胞局部化规则尚不清楚.
研究的目的:
- 在氧化应激过程中研究细胞下乌比奎丁局部化的规则.
- 识别参与非细胞质乌比奎信号传递的蛋白质和途径.
- 阐明VCP (含瓦洛辛蛋白) 和其适应器在应激反应中的作用.
主要方法:
- 在氧化应激下哺乳动物细胞中的亚细胞性乌比基蛋白质组学 (酸).
- 分析蛋白质招募到非细胞质区的分析.
- 调查了VCP和NPLOC4.4的随处可见素依赖的招募.
主要成果:
- 在氧化应激过程中,与K63结合的乌比奎链在非细胞分裂区积聚.
- 鉴定了2,046个在非细胞体内无处不在的蛋白质,与免疫信号传递和翻译有关.
- VCP及其适配器NPLOC4被招募到非细胞分裂区,以一种依赖于无处不在的方法.
- VCP/NPLOC4活性保持低的非细胞质K63-ubiquitin水平,这一过程被反应性氧物质破坏.
结论:
- 局部化泛素信号传递和VCP/NPLOC4活动对于细胞应激反应机制至关重要.
- 破坏依赖于无处不在的VCP/NPLOC4功能会影响应激适应.
- 这项研究揭示了在压力下亚细胞蛋白质组重塑的新途径和分子参与者.
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