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-Structure paper
| タイトル | Molecular architecture of human LYCHOS involved in lysosomal cholesterol signaling. |
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| ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 32, Issue 5, Page 905-913, Year 2025 |
| 掲載日 | 2025年1月17日 |
著者 | Qi Xiong / Zhini Zhu / Tingting Li / Xiaotian Li / Zixuan Zhou / Yulin Chao / Chuanhui Yang / Suihan Feng / Qianhui Qu / Dianfan Li / ![]() |
| PubMed 要旨 | Lysosomal membrane protein LYCHOS (lysosomal cholesterol signaling) translates cholesterol abundance to mammalian target of rapamycin activation. Here we report the 2.11-Å structure of human LYCHOS, ...Lysosomal membrane protein LYCHOS (lysosomal cholesterol signaling) translates cholesterol abundance to mammalian target of rapamycin activation. Here we report the 2.11-Å structure of human LYCHOS, revealing a unique fusion architecture comprising a G-protein-coupled receptor (GPCR)-like domain and a transporter domain that mediates homodimer assembly. The NhaA-fold transporter harbors a previously uncharacterized intramembrane Na pocket. The GPCR-like domain is stabilized, by analogy to canonical GPCRs, in an inactive state through 'tethered antagonism' by a lumenal loop and strong interactions at the cytosol side preventing the hallmark swing of the sixth transmembrane helix seen in active GPCRs. A cholesterol molecule and an associated docosahexaenoic acid (DHA)-phospholipid are entrapped between the transporter and GPCR-like domains, with the DHA-phospholipid occupying a pocket previously implicated in cholesterol sensing, indicating inter-domain coupling via dynamic lipid-protein interactions. Our work provides a high-resolution framework for functional investigations of the understudied LYCHOS protein. |
リンク | Nat Struct Mol Biol / PubMed:39824977 |
| 手法 | EM (単粒子) |
| 解像度 | 2.11 Å |
| 構造データ | EMDB-39851, PDB-8z8z: |
| 化合物 | ![]() ChemComp-NAG: ![]() ChemComp-6OU: ![]() ChemComp-CLR: ![]() PDB-1l1c: ![]() ChemComp-LBN: ![]() ChemComp-NA: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Lysosome / GPCR-like / Transporter / Cholesterol |
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homo sapiens (ヒト)
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