Lysosomal GPCR-like protein LYCHOS signals cholesterol sufficiency to mTORC1.

Lysosomal GPCR-like protein LYCHOS signals cholesterol sufficiency to mTORC1.
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DOI:
10.1126/science.abg6621
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发表时间:
2022-09-16
期刊:
影响因子:
56.9
通讯作者:
Zoncu, Roberto
Zoncu, Roberto
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Shin, Hijai R.;Citron, Y. Rose;Wang, Lei;Tribouillard, Laura;Goul, Claire S.;Stipp, Robin;Sugasawa, Yusuke;Jain, Aakriti;Samson, Nolwenn;Lim, Chun-Yan;Davis, Oliver B.;Castaneda-Carpio, David;Qian, Mingxing;Nomura, Daniel K.;Perera, Rushika M.;Park, Eunyong;Covey, Douglas F.;Laplante, Mathieu;Evers, Alex S.;Zoncu, Roberto

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溶酶体在感知必需营养物质(包括胆固醇)时协调细胞代谢和生长。通过对溶酶体蛋白质组的生物信息学分析,我们确定了溶酶体胆固醇信号(LYCHOS,以前被标记为g蛋白偶联受体155),这是一种多结构域跨膜蛋白,可使主要生长调节剂,雷帕霉素复合物1 (mTORC1)的蛋白激酶机制靶点的胆固醇依赖性激活。胆固醇结合到LYCHOS的n端透孔样区域,并使该位点发生突变,损害了mTORC1的激活。在高胆固醇浓度下,LYCHOS通过一个保守的细胞质面环结合到GATOR1复合体上,GATOR1复合体是一种用于拉格鸟苷三磷酸酶的gtpase激活蛋白。通过隔离GATOR1, LYCHOS促进胆固醇和rag依赖性mTORC1向溶酶体的募集。因此,LYCHOS在胆固醇感知的溶酶体途径中起作用,并将胆固醇浓度与mtorc1依赖性合成代谢信号相结合。
Lysosomes coordinate cellular metabolism and growth upon sensing of essential nutrients, including cholesterol. Through bioinformatic analysis of lysosomal proteomes, we identified LYsosomal CHOlesterol Signaling (LYCHOS, previously annotated as G-protein coupled receptor 155), a multidomain transmembrane protein that enables cholesterol-dependent activation of the master growth regulator, the protein kinase mechanistic Target of Rapamycin Complex 1 (mTORC1). Cholesterol bound to the N-terminal permease-like region of LYCHOS, and mutating this site impaired mTORC1 activation. At high cholesterol concentrations, LYCHOS bound to the GATOR1 complex, a GTPase-activating protein for the Rag guanosine triphosphatases, through a conserved cytoplasm-facing loop. By sequestering GATOR1, LYCHOS promotes cholesterol- and Rag-dependent recruitment of mTORC1 to lysosomes. Thus, LYCHOS functions in a lysosomal pathway for cholesterol sensing, and couples cholesterol concentrations to mTORC1-dependent anabolic signaling.
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