mTORC1对LST2进行酸化和稳定,从而对EGFR产生负调节
Stefania Battaglioni1, Louise-Marie Craigie1, Sofia Filippini1
1Biozentrum, University of Basel, Basel 4056, Switzerland.
概括
拉巴胺复合体1 (TORC1) 的位直接化LST2,这是一个调节表皮生长因子受体 (EGFR) 信号的蛋白质. 这种相互作用揭示了一个新的负反循环,其中mTORC1通过LST2.2.抑制EGFR信号传递.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 拉巴胺素复合体1 (TORC1) 的标是细胞生长,新陈代谢和疾病的关键调节者.
- 了解哺乳动物TORC1 (mTORC1) 的下游信号和反机制至关重要.
- mTORC1通过TOR信号 (TOS) 模式识别基质,促进远部位的酸化.
研究的目的:
- 为了研究mTORC1及其基质之间的相互作用.
- 为了识别mTORC1信号传输的新型下游影响者.
- 阐明LST2在mTORC1介导的细胞过程中的作用.
主要方法:
- 在LST2 (氨基酸401-405) 中识别TOS动机.
- 在体外酸化试验以确认mTORC1-介导的LST2在S670.0的酸化.
- 在对mTORC1活动的反应中分析LST2的无处不在和稳定性.
- 在LST的存在和缺席下评估EGFR信号2.2.
主要成果:
- LST2 含有功能性 TOS 基因,并由 mTORC1 在 S670.0 处直接化.
- 根据mTORC1的S670酸化,LST2在K87促进其单双化,使蛋白质稳定.
- 单基化LST2表现出稳定的网状分布.
- 在mTORC1无活化后,非酸化的LST2被蛋白质酶分解.
- 失去LST2会导致表皮生长因子受体 (EGFR) 信号的增强.
结论:
- mTORC1直接化LST2,通过单双化稳定它.
- LST2作为EGFR信号的负调节剂.
- mTORC1通过LST2蛋白质负面反上游EGFR信号.
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