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-Structure paper
タイトル | Structure of the Schizosaccharomyces pombe Gtr-Lam complex reveals evolutionary divergence of mTORC1-dependent amino acid sensing. |
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ジャーナル・号・ページ | Structure, Vol. 31, Issue 9, Page 1065-11076.e5, Year 2023 |
掲載日 | 2023年9月7日 |
![]() | Steven D Tettoni / Shawn B Egri / Dylan D Doxsey / Kristen Veinotte / Christna Ouch / Jeng-Yih Chang / Kangkang Song / Chen Xu / Kuang Shen / ![]() |
PubMed 要旨 | mTORC1 is a protein kinase complex that controls cellular growth in response to nutrient availability. Amino acid signals are transmitted toward mTORC1 via the Rag/Gtr GTPases and their upstream ...mTORC1 is a protein kinase complex that controls cellular growth in response to nutrient availability. Amino acid signals are transmitted toward mTORC1 via the Rag/Gtr GTPases and their upstream regulators. An important regulator is LAMTOR, which localizes Rag/Gtr on the lysosomal/vacuole membrane. In human cells, LAMTOR consists of five subunits, but in yeast, only three or four. Currently, it is not known how variation of the subunit stoichiometry may affect its structural organization and biochemical properties. Here, we report a 3.1 Å-resolution structural model of the Gtr-Lam complex in Schizosaccharomyces pombe. We found that SpGtr shares conserved architecture as HsRag, but the intersubunit communication that coordinates nucleotide loading on the two subunits differs. In contrast, SpLam contains distinctive structural features, but its GTP-specific GEF activity toward SpGtr is evolutionarily conserved. Our results revealed unique evolutionary paths of the protein components of the mTORC1 pathway. |
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手法 | EM (単粒子) |
解像度 | 3.08 Å |
構造データ | EMDB-29497, PDB-8fw5: |
化合物 | ![]() ChemComp-GDP: ![]() ChemComp-AF3: ![]() ChemComp-MG: |
由来 |
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![]() | SIGNALING PROTEIN / mTOR complex 1 (mTORC1) / Rag GTPase / Gtr GTPase / LAMTOR / GATOR1 / nutrient sensing |