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KICSTOR将GATOR1招募到溶酶体中,并且对于营养素来调节mTORC1是必要的
Rachel L Wolfson1,2,3,4, Lynne Chantranupong1,2,3,4, Gregory A Wyant1,2,3,4
1Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Department of Biology, 9 Cambridge Center, Cambridge, Massachusetts 02142, USA.
Nature
|February 16, 2017
概括
一个新发现的KICSTOR蛋白质复合体负面调节了RAPAMYCIN复合体1 (mTORC1) 信号传递的机械标. 这种复合物对于抑制mTORC1的反应至关重要,其功能障碍与神经疾病有关.
科学领域:
- 细胞生物学
- 分子生物学
- 生物化学
背景情况:
- 拉巴胺复合体1 (mTORC1) 的机械标控制细胞生长,并与癌症和等疾病有关.
- 氨基酸通过 Rag GTPases促进mTORC1的转移到 lysosome来调节mTORC1的活动.
- 已知GATOR1和GATOR2是Rag GTPases对氨基酸的反应的调节者.
研究的目的:
- 确定参与氨基酸感应和mTORC1调节的新型蛋白质复合体.
- 阐明KICSTOR复合体在控制mTORC1信号中的分子功能.
- 研究KICSTOR在细胞营养感应中的作用及其与人类疾病的相关性.
主要方法:
- 蛋白质复合体的识别和表征.
- 使用人类细胞系进行细胞本地化研究.
- 在淘汰赛小鼠模型中分析mTORC1信号 (SZT2缺陷).
- 生物化学测试以确定蛋白质与蛋白质的相互作用.
主要成果:
- 在营养缺乏时抑制mTORC1所必需的KICSTOR复合体 (KPTN,ITFG2,C12orf66,SZT2) 的鉴定.
- KICSTOR定位在溶酶体中,对于GATOR1的招募和功能是必需的.
- 在小鼠中,SZT2的丧失导致mTORC1信号的升高,特别是在神经元中.
- KICSTOR组件的突变与特征为过度活跃的mTORC1的神经疾病有关.
结论:
- KICSTOR作为mTORC1信号的溶酶相关负调节剂.
- KICSTOR在Rag GTPases的上游作用,调解营养缺乏的抑制信号.
- KICSTOR的失调有助于人类疾病,突出其治疗潜力.
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