9CUS
BmrCD in the outward-facing conformation bound to Hoechsts
Summary for 9CUS
| Entry DOI | 10.2210/pdb9cus/pdb |
| Related | 8FMV 8T1P |
| EMDB information | 29297 40974 45940 |
| Descriptor | Probable multidrug resistance ABC transporter ATP-binding/permease protein YheI, Probable multidrug resistance ABC transporter ATP-binding/permease protein YheH, MAGNESIUM ION, ... (7 entities in total) |
| Functional Keywords | abc transporter, exporter, membrane protein, transport |
| Biological source | Bacillus subtilis subsp. subtilis str. 168 More |
| Total number of polymer chains | 2 |
| Total formula weight | 162263.57 |
| Authors | Tang, Q.,Mchaourab, H.S. (deposition date: 2024-07-26, release date: 2025-08-13, Last modification date: 2025-12-03) |
| Primary citation | Tang, Q.,Sinclair, M.,Bisignano, P.,Zhang, Y.,Tajkhorshid, E.,Mchaourab, H.S. Drug-bound outward-facing conformation of a heterodimeric ABC exporter suggests a putative mechanism of drug translocation. Nat Commun, 16:10403-10403, 2025 Cited by PubMed Abstract: 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. PubMed: 41285748DOI: 10.1038/s41467-025-65318-6 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.1 Å) |
Structure validation
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