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-Structure paper
| タイトル | Drug-bound outward-facing conformation of a heterodimeric ABC exporter suggests a putative mechanism of drug translocation. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 10403, Year 2025 |
| 掲載日 | 2025年11月24日 |
著者 | Qingyu Tang / Matt Sinclair / Paola Bisignano / Yunsen Zhang / Emad Tajkhorshid / Hassane S Mchaourab / ![]() |
| PubMed 要旨 | Multidrug transport by ATP binding cassette (ABC) exporters entails a mechanism to modulate drug affinity across the transport cycle. Here, we combine cryo-EM and molecular dynamics (MD) simulations ...Multidrug transport by ATP binding cassette (ABC) exporters entails a mechanism to modulate drug affinity across the transport cycle. Here, we combine cryo-EM and molecular dynamics (MD) simulations to illuminate a lipid-competition mechanism to drive substrate translocation by ABC exporters. We determine cryo-EM structures of the ABC transporter BmrCD in drug-loaded inward-facing (IF) and outward-facing (OF) conformations in lipid nanodiscs to reveal the structural basis of alternating access, details of drug-transporter interactions, and the scale of drug movement between the two conformations. Remarkably, the structures uncover lipid molecules bound in or near the transporter vestibule along with the drugs. MD trajectories from the IF structure show that these lipids stimulate drug disorder and translocation towards the innermost constricted region of the vestibule. Similarly, bound lipids enter the OF vestibule and weaken drug-transporter interactions facilitating drug release. Our results complete a near-atomic model of BmrCD's conformational cycle and suggest the modulation of substrate-transporter interactions by lipids. |
リンク | Nat Commun / PubMed:41285748 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.1 - 3.4 Å |
| 構造データ | EMDB-45938, PDB-9cup: EMDB-45939, PDB-9cur: EMDB-45940, PDB-9cus: |
| 化合物 | ![]() ChemComp-POV: ![]() ChemComp-ATP: ![]() ChemComp-MG: ![]() ChemComp-HT1: ![]() ChemComp-AOV: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / ABC transporter / Exporter / transport |
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