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-Structure paper
タイトル | Structure and mechanism of human cystine exporter cystinosin. |
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ジャーナル・号・ページ | Cell, Vol. 185, Issue 20, Page 3739-3752.e18, Year 2022 |
掲載日 | 2022年9月29日 |
著者 | Xue Guo / Philip Schmiege / Tufa E Assafa / Rong Wang / Yan Xu / Linda Donnelly / Michael Fine / Xiaodan Ni / Jiansen Jiang / Glenn Millhauser / Liang Feng / Xiaochun Li / |
PubMed 要旨 | Lysosomal amino acid efflux by proton-driven transporters is essential for lysosomal homeostasis, amino acid recycling, mTOR signaling, and maintaining lysosomal pH. To unravel the mechanisms of ...Lysosomal amino acid efflux by proton-driven transporters is essential for lysosomal homeostasis, amino acid recycling, mTOR signaling, and maintaining lysosomal pH. To unravel the mechanisms of these transporters, we focus on cystinosin, a prototypical lysosomal amino acid transporter that exports cystine to the cytosol, where its reduction to cysteine supplies this limiting amino acid for diverse fundamental processes and controlling nutrient adaptation. Cystinosin mutations cause cystinosis, a devastating lysosomal storage disease. Here, we present structures of human cystinosin in lumen-open, cytosol-open, and cystine-bound states, which uncover the cystine recognition mechanism and capture the key conformational states of the transport cycle. Our structures, along with functional studies and double electron-electron resonance spectroscopic investigations, reveal the molecular basis for the transporter's conformational transitions and protonation switch, show conformation-dependent Ragulator-Rag complex engagement, and demonstrate an unexpected activation mechanism. These findings provide molecular insights into lysosomal amino acid efflux and a potential therapeutic strategy. |
リンク | Cell / PubMed:36113465 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 3.0 - 3.4 Å |
構造データ | EMDB-27488, PDB-8dke: EMDB-27489, PDB-8dki: EMDB-27490, PDB-8dkm: EMDB-27492, PDB-8dkw: EMDB-27493, PDB-8dkx: PDB-8dyp: |
化合物 | ChemComp-IYY: ChemComp-SO4: ChemComp-OLC: |
由来 |
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キーワード | MEMBRANE PROTEIN/Transport protein / Cystine / transporter / lysosome / MEMBRANE PROTEIN / MEMBRANE PROTEIN-Transport protein complex / TRANSPORT PROTEIN / Lysosomal transporter / Proton-coupled transporter / Cystine transporter / Cystinosis |