奥林通过特异性化Met1结合的多比基来对抗LUBAC信号传递
Kirstin Keusekotten1, Paul Ronald Elliott, Laura Glockner
1Medical Research Council Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK.
Cell
|June 11, 2013
概括
研究人员发现了OTULIN,它是Met1链接的乌比奎链的一种特定的deubiquitinase. 奥图林调节线性无素信号通路,影响NF-κB反应和细胞死亡.
科学领域:
- 分子生物学分子生物学
- 细胞信号传输 细胞信号传输
- 乌比奎丁生物学
背景情况:
- 线性ubiquitin (Ub) 链组装复合体 (LUBAC) 对于组装调节NF-κB信号的Met1链的Ub链至关重要.
- 针对 Met1 链接的专用二维基因酶 (DUB) 对于控制 Ub 信号是必不可少的,但尚未确定任何一种.
研究的目的:
- 为了识别和表征一种新型的DUB,专门用于Met1链接的无处不在链.
- 阐明这种新的DUB的作用机制和生物功能.
主要方法:
- 用duibiquitin确定OTULIN催化域的晶体结构.
- 生物化学试验以评估OTULIN的活性和基质特异性.
- 基于细胞的测试,以评估OTULIN在NF-κB信号传递和TNFα诱导的细胞死亡中的作用.
主要成果:
- 鉴定出OTULIN (FAM105B) 是一种对Met1链路极具特异性的DUB.
- 晶体结构揭示了Met1-特定的Ub-结合点和基质辅助催化.
- 奥图林调节NF-κB信号传递,使细胞对TNFα诱导的死亡敏感,并与LUBAC相互作用.
结论:
- 奥林是Met1-polyUb信号传输的关键调节剂.
- OTULIN的特点和机制为Ub链条监管提供了洞察力.
- 奥图林在免疫信号通路中起着至关重要的作用.
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