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通过无标签质谱法进行AMPK酸的分析,揭示了大量的mTORC1-调节的基质

William J Smiles^1,2, Ashley J Ovens³, Dingyi Yu⁴

¹Metabolic Signalling Laboratory, St. Vincent's Institute of Medical Research, Fitzroy, VIC 3065 Australia.

npj metabolic health and disease

|March 7, 2025

概括

拉巴胺素复合体1 (mTORC1) 的机械标酸化多个AMPK位点,影响细胞生长和新陈代谢. 这项研究揭示了AMPK上的新的mTORC1基质,在营养压力下影响增殖和基因表达.

科学领域:

细胞代谢的细胞代谢.
分子生物学分子生物学
癌症研究癌症研究

背景情况:

营养感应酶AMPK和mTORC1通过负反循环调节细胞生长.
mTORC1在α2-S345酸化AMPK,抑制AMPK活性,并在营养稀缺期间促进增殖.

研究的目的:

为了在AMPK复合体内识别额外的功能mTORC1基质.
研究这些新型酸化位在细胞过程和代谢调节中的作用.

主要方法:

质谱法被用来对人类细胞AMPK复合体的酸化固化度进行分析.
确定了七个mTORC1-敏感的酸化位,包括β1-S182,β2-S184,以及四个在γ2 N-终端延伸.
用于评估特定酸化事件的功能影响的局部定向突变发生 (β2-S184A).

主要成果:

在β1-S182和β2-S184的酸化被证实是mTORC1基质.
β2-S184的突变增加了核AMPK活性,在营养压力下增强了扩散,改变了葡萄糖代谢和Akt信号基因表达.
在含有α1和α2的AMPK复合体之间观察到不同的β子单元酸化.

结论:

mTORC1直接或间接酸化了超越α2-S345.5的多个AMPK残留物.
这些新的化位点,特别是β2-S184,在调节AMPK活性,核定位和细胞对营养应激反应方面发挥着重要作用.
这些发现表明mTORC1-AMPK相互作用在癌细胞内的代谢重编程中起着更广泛的作用.

关键词:

生物化学生物化学生物技术是指生物技术.癌症癌症癌症癌症

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