Regulation of TORC1 in response to amino acid starvation via lysosomal recruitment of TSC2.

Regulation of TORC1 in response to amino acid starvation via lysosomal recruitment of TSC2.
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DOI:
10.1016/j.cell.2014.01.024
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发表时间:
2014-02-13
期刊:
影响因子:
64.5
通讯作者:
Teleman AA
Teleman AA
中科院分区:
生物学1区
文献类型:
--
作者:
Demetriades C;Doumpas N;Teleman AA

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TOR复合物1(TORC 1)是细胞生长和代谢的有效合成代谢调节剂。当细胞具有足够的氨基酸时,TORC 1由于其通过Rag GTP酶介导的溶酶体定位而具有活性。在氨基酸去除后,Rag GTP酶释放TORC 1,使其变得细胞质和无活性。我们在这里表明,氨基酸去除后,Rag GTP酶也招募TSC 2的溶酶体,在那里它可以作用于Rheb。只有当Rag GTP酶和Rheb都失活时,TORC 1才完全从溶酶体释放。在氨基酸撤回时,缺乏TSC 2的细胞不能从溶酶体完全释放TORC 1,不能完全抑制TORC 1,并且不能生理性地调整以适应氨基酸饥饿。这些数据表明,TSC 2亚细胞定位的调节可能是控制其活性的一般机制,并将TSC 2置于TORC 1的氨基酸传感途径中。
TOR Complex 1 (TORC1) is a potent anabolic regulator of cellular growth and metabolism. When cells have sufficient amino acids, TORC1 is active due to its lysosomal localization mediated via the Rag GTPases. Upon amino acid removal, the Rag GTPases release TORC1, causing it to become cytoplasmic and inactive. We show here that upon amino acid removal, the Rag GTPases also recruit TSC2 to the lysosome, where it can act on Rheb. Only when both the Rag GTPases and Rheb are inactive is TORC1 fully released from the lysosome. Upon amino acid withdrawal, cells lacking TSC2 fail to completely release TORC1 from the lysosome, fail to completely inactivate TORC1, and fail to adjust physiologically to amino acid starvation. These data suggest that regulation of TSC2 subcellular localization may be a general mechanism to control its activity, and places TSC2 in the amino acid sensing pathway to TORC1.
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