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-Structure paper
タイトル | Structural basis for lipid transfer by the ATG2A-ATG9A complex. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Year 2024 |
掲載日 | 2024年8月22日 |
著者 | Yang Wang / Selma Dahmane / Rujuan Ti / Xinyi Mai / Lizhe Zhu / Lars-Anders Carlson / Goran Stjepanovic / |
PubMed 要旨 | Autophagy is characterized by the formation of double-membrane vesicles called autophagosomes. Autophagy-related proteins (ATGs) 2A and 9A have an essential role in autophagy by mediating lipid ...Autophagy is characterized by the formation of double-membrane vesicles called autophagosomes. Autophagy-related proteins (ATGs) 2A and 9A have an essential role in autophagy by mediating lipid transfer and re-equilibration between membranes for autophagosome formation. Here we report the cryo-electron microscopy structures of human ATG2A in complex with WD-repeat protein interacting with phosphoinositides 4 (WIPI4) at 3.2 Å and the ATG2A-WIPI4-ATG9A complex at 7 Å global resolution. On the basis of molecular dynamics simulations, we propose a mechanism of lipid extraction from the donor membranes. Our analysis revealed 3:1 stoichiometry of the ATG9A-ATG2A complex, directly aligning the ATG9A lateral pore with ATG2A lipid transfer cavity, and an interaction of the ATG9A trimer with both the N-terminal and the C-terminal tip of rod-shaped ATG2A. Cryo-electron tomography of ATG2A liposome-binding states showed that ATG2A tethers lipid vesicles at different orientations. In summary, this study provides a molecular basis for the growth of the phagophore membrane and lends structural insights into spatially coupled lipid transport and re-equilibration during autophagosome formation. |
リンク | Nat Struct Mol Biol / PubMed:39174844 |
手法 | EM (単粒子) / EM (トモグラフィー) |
解像度 | 3.23 - 7.05 Å |
構造データ | EMDB-37086, PDB-8kbx: EMDB-37087: Cryo-EM structure of ATG2A-WIPI4 complex EMDB-37088, PDB-8kbz: EMDB-37091, PDB-8kc3: EMDB-38839, PDB-8y1l: EMDB-50658: Cryo-electron tomogram of ATG2A and small unilamellar vesicles EMDB-50659: Cryo-electron tomogram of ATG2A and small unilamellar vesicles EMDB-50660: Cryo-electron tomogram of ATG2A and small unilamellar vesicles EMDB-50662: Cryo-electron tomogram of ATG2A and small unilamellar vesicles EMDB-50666: Cryo-electron tomogram of ATG2A and small unilamellar vesicles EMDB-50667: Cryo-electron tomogram of ATG2A and small unilamellar vesicles |
由来 |
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キーワード | LIPID TRANSPORT/MEMBRANE PROTEIN / Lipid transport / ATG2A-WIPI4 complex / single particle cryo-EM / Peripheral membrane proteins / LIPID TRANSPORT-MEMBRANE PROTEIN complex / MEMBRANE PROTEIN / ATG2A / Lipid scramblase / ATG9A / Lipid transfer / ATG9A-ATG2A-WIPI4 complex / autophagy |