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卡斯托尔1和卡斯托尔2对不同水平的氨酸作出反应,以调节mTORC1的活动

Chan Liu¹, Yifan Zhang², Yilun Wang¹

¹Institute of Geriatrics, Affiliated Nantong Hospital of Shanghai University, The Sixth People's Hospital of Nantong, Shanghai Engineering Research Center of Organ Repair, Joint International Research Laboratory of Biomaterials and Biotechnology in Organ Repair (Ministry of Education), School of Medicine, Shanghai University, Nantong 226011, China.

|January 8, 2026

概括

卡斯托尔蛋白质充当双重氨酸传感器,卡斯托尔1检测低水平,卡斯托尔2检测高水平. 这种双重感应机制精确调整了拉巴胺素复合体1 (mTORC1) 活性和肌细胞形成的机械标.

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 (mTORC1) 的机械标控制细胞生长,以响应氨基酸的可用性.
像CASTOR1这样的氨基酸传感器调节mTORC1,但动态氨基酸水平反应的精确机制尚不清楚.

研究的目的:

研究CASTOR1的同类物CASTOR2在调节mTORC1活动中的作用.
阐明 CASTOR1 和 CASTOR2.2 的独特的氨酸感应机制.

主要方法:

生物化学测试以评估蛋白质结合和相互作用.
在氨酸结合时,CASTOR蛋白质的构造变化的分析.
在C2C12肌肉细胞中进行功能研究,以评估mTORC1和肌肉发生调节.

主要成果:

卡斯托尔1和卡斯托尔2类似地结合氨酸,但表现出不同的敏感性 (卡斯托尔1对低度,卡斯托尔2对高度).
这两种蛋白质都抑制了Mios-GATOR1相互作用;氨酸结合会诱导与Mios的解离.
卡斯托尔蛋白质在肌肉中表达,并调节mTORC1和肌体发生,这取决于C2C12细胞中阿金的可用性.

结论:

卡斯托蛋白作为双氨酸传感器,对低氨酸水平和高氨酸水平提供不同的反应.
这种双重传感机制对于微调mTORC1信号和肌体生成,以应对营养物质波动至关重要.

关键词:

卡斯托尔 (Castor) 是一个名字.在CASTOR2中使用CASTOR2.在 GATOR1 的位置上.在GATOR2中,我们可以使用GATOR2.氨基酸传感器是一种氨基酸传感器.在阿根廷,阿根廷人.在mTORC1信号传输中.肌肉发育 (myogenesis) 是一个过程.

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