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Analysis of SCAP N-glycosylation and Trafficking in Human Cells
Published on: November 8, 2016
斯芬戈辛-1-酸盐是E3泛基素结合酶TRAF2的缺失辅因子
Sergio E Alvarez1, Kuzhuvelil B Harikumar, Nitai C Hait
1Department of Biochemistry and Molecular Biology and the Massey Cancer Center, Virginia Commonwealth University School of Medicine, 1101 E. Marshall Street, Richmond, Virginia 23298, USA.
Nature
|June 26, 2010
概括
斯芬哥辛-1-酸盐 (S1P) 作为TRAF2的辅因子,TNF-α信号传递中的关键酶. 这一发现揭示了调节NF-kappaB激活的新机制,这对炎症和免疫至关重要.
科学领域:
- 细胞信号传递途径 细胞信号传递途径
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 瘤坏死因子 (TNF) - - 阿尔法信号激活NF-kappaB,这是一个转录因子,对免疫反应至关重要.
- TRAF2 (TNF受体相关因子2) 对于NF-kappaB激活至关重要,但其在RIP1无处不在中的直接作用尚不清楚.
- 斯芬戈基因酶1 (SphK1) 产生斯芬戈-1-酸盐 (S1P),这是一个参与细胞存活的脂质媒介.
研究的目的:
- 研究S1P在TRAF2介导NF-kappaB激活中的作用.
- 为了确定S1P是否作为TRAF2的E3酶活性的辅因子.
- 为了阐明 TRAF2 介导的 RIP1 无化机制.
主要方法:
- 采用重组TRAF2和RIP1.1进行的体外无化试验.
- 测量S1P产生及其对NF-kappaB路径组件的影响.
- 对S1P与TRAF2结合的分析2.
主要成果:
- SphK1和细胞内S1P是RIP1无处不在,IKK/IkappaBalpha酸化和NF-kappaB激活所必需的.
- S1P直接与TRAF2的RING域结合,并增强其E3酶活性.
- 具体来说,S1P通过TRAF2.2促进了RIP1的素-63结合的多比基化.
结论:
- TRAF2是S1P的一个新型细胞内标.
- S1P是TRAF2 E3泛酸酶活性的关键辅因子,调节素-63相关的多聚基化.
- 这一发现为SphK1/S1P和TRAF2.2的NF-kappaB通路调节建立了新的范式.
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