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-Structure paper
| タイトル | Structural basis for mTORC1 regulation by the CASTOR1-GATOR2 complex. |
|---|---|
| ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 32, Issue 10, Page 1980-1988, Year 2025 |
| 掲載日 | 2025年7月25日 |
著者 | Rachel M Jansen / Clément Maghe / Karla Tapia / Selina Wu / Serim Yang / Xuefeng Ren / Roberto Zoncu / James H Hurley / ![]() |
| PubMed 要旨 | Mechanistic target of rapamycin complex 1 (mTORC1) is a nutrient-responsive master regulator of metabolism. Amino acids control the recruitment and activation of mTORC1 at the lysosome through the ...Mechanistic target of rapamycin complex 1 (mTORC1) is a nutrient-responsive master regulator of metabolism. Amino acids control the recruitment and activation of mTORC1 at the lysosome through the nucleotide loading state of the heterodimeric Rag GTPases. Under low nutrients, including arginine, the GTPase-activating protein complex GATOR1 promotes GTP hydrolysis on RagA/B, inactivating mTORC1. GATOR1 is regulated by the cage-like GATOR2 complex and cytosolic amino acid sensors. To understand how the arginine sensor CASTOR1 binds to GATOR2 to disinhibit GATOR1 under low cytosolic arginine, we determined the cryo-electron microscopy structure of human GATOR2 bound to CASTOR1 in the absence of arginine. Two MIOS WD40 domain β-propellers of the GATOR2 cage engage with both subunits of a single CASTOR1 homodimer. Each propeller binds to a negatively charged MIOS-binding interface on CASTOR1 that is distal to the arginine pocket. The structure shows how arginine-triggered loop ordering in CASTOR1 blocks the MIOS-binding interface, switches off its binding to GATOR2 and, thus, communicates to downstream mTORC1 activation. |
リンク | Nat Struct Mol Biol / PubMed:40715445 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.02 - 3.89 Å |
| 構造データ | EMDB-70833, PDB-9oti: ![]() EMDB-71136: Focused map GATOR2-CASTOR1 complex ![]() EMDB-71137: Focused map for CASTOR1-GATOR2 complex ![]() EMDB-71138: Focused map for CASTOR1-GATOR2 complex ![]() EMDB-71139: Focused map for CASTOR1-GATOR2 complex ![]() EMDB-71140: Focused map for CASTOR1-GATOR2 complex ![]() EMDB-71141: Focused maps for CASTOR1-GATOR2 complex ![]() EMDB-71142: Consesus map for CASTOR1-GATOR2 complex ![]() EMDB-71143: Focused map for CASTOR1-GATOR2 complex |
| 化合物 | ![]() ChemComp-ZN: |
| 由来 |
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キーワード | SIGNALING PROTEIN / Complex / mTORC1 / Signaling / Nutrients / Amino Acid Sensing |
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