The folliculin tumor suppressor is a GAP for the RagC/D GTPases that signal amino acid levels to mTORC1.

The folliculin tumor suppressor is a GAP for the RagC/D GTPases that signal amino acid levels to mTORC1.
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DOI:
10.1016/j.molcel.2013.09.016
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发表时间:
2013-11-21
期刊:
影响因子:
16
通讯作者:
Sabatini DM
Sabatini DM
中科院分区:
生物学1区
文献类型:
--
作者:
Tsun ZY;Bar-Peled L;Chantranupong L;Zoncu R;Wang T;Kim C;Spooner E;Sabatini DM

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mTORC 1激酶是一种主要的生长调节因子,可以感知许多环境信号,包括氨基酸。Rag GTP酶与mTORC 1相互作用,并通过促进mTORC 1易位至溶酶体表面(其活化位点)来发出氨基酸充足的信号。Rags是不寻常的GTP酶,因为它们作为专性异二聚体起作用,其由RagA或B与RagC或D结合组成。虽然RagA/B负载GTP启动了mTORC 1的氨基酸信号传导,但RagC/D的作用尚不清楚。在这里,我们发现RagC/D是mTORC 1与Rag异源二聚体相互作用的关键调节因子,并且出乎意料地,RagC/D必须与GDP结合才能发生相互作用。我们确定FLCN和它的结合伙伴,FNIP 1/2,作为Rag相互作用的蛋白质与GAP活性的RagC/D,但不是RagA/B。因此,我们揭示了RagC/D在mTORC 1激活中的作用和FLCN肿瘤抑制因子的分子功能。
The mTORC1 kinase is a master growth regulator that senses numerous environmental cues, including amino acids. The Rag GTPases interact with mTORC1 and signal amino acid sufficiency by promoting the translocation of mTORC1 to the lysosomal surface, its site of activation. The Rags are unusual GTPases in that they function as obligate heterodimers, which consist of RagA or B bound to RagC or D. While the loading of RagA/B with GTP initiates amino acid signaling to mTORC1, the role of RagC/D is unknown. Here, we show that RagC/D is a key regulator of the interaction of mTORC1 with the Rag heterodimer and that, unexpectedly, RagC/D must be GDP-bound for the interaction to occur. We identify FLCN and its binding partners, FNIP1/2, as Rag-interacting proteins with GAP activity for RagC/D, but not RagA/B. Thus, we reveal a role for RagC/D in mTORC1 activation and a molecular function for the FLCN tumor suppressor.
滤泡素通过调节自噬有助于肾癌中 VHL 肿瘤抑制活性。
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