氧化通过控制氧气可用性来促进氨酸N-降解蛋白质分解
Haeun Kim1,2, Ya-Min Tian1,2, Peter J Ratcliffe1,2,3
1Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7FZ, United Kingdom.
概括
氧化 (NO) 通过N-降解通路间接调节蛋白质稳定性,通过调节2-氨基乙乙醇二氧化酶 (ADO) 的氧气可用性. 这种机制将氧气供应和细胞呼吸与信号通路联系起来.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 分子机制的分子机制
背景情况:
- N-降解通路,特别是Cys/Arg分支,针对N-终端囊蛋白 (Nt-Cys) 蛋白进行依赖氧的蛋白解.
- 2-氨基乙乙醇二氧化酶 (ADO) 催化囊二氧化,但对氧气非常敏感.
- 已知氧化 (NO) 在这种途径中会影响基质稳定性,但潜在的机制尚不清楚.
研究的目的:
- 阐明氧化 (NO) 调节Cys/Arg N-降解通路的机制.
- 调查NO如何调节N终端囊蛋白 (Nt-Cys) 蛋白的稳定性.
主要方法:
- 研究了NO对ADO基质稳定性的间接影响.
- 通过细胞C氧化酶抑制分析了NO对细胞氧气消耗的影响.
- 测量氧气可用性的变化及其对ADO基质水平的影响.
主要成果:
- NO通过改变ADO的氧气可用性来间接调节Nt-Cys蛋白的稳定性.
- NO可以竞争性地抑制细胞染色体C氧化酶,从而改变细胞的氧气消耗.
- 由于NO暴露增加了氧气的可用性,改变了ADO基质水平.
结论:
- NO通过调节ADO的氧气可用性来调节Cys/Arg N-降解通路,而不是通过直接相互作用来调节.
- 这种机制将氧气供应和线粒体呼吸与细胞信号通路连接起来.
- 这些发现提供了NO生物可用性和蛋白质降解之间的机制联系.
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