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- PDB-7ow8: CryoEM structure of the ABC transporter BmrA E504A mutant in comp... -
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Basic information
Entry | Database: PDB / ID: 7ow8 | |||||||||||||||||||||
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Title | CryoEM structure of the ABC transporter BmrA E504A mutant in complex with ATP-Mg | |||||||||||||||||||||
![]() | Multidrug resistance ABC transporter ATP-binding/permease protein BmrA | |||||||||||||||||||||
![]() | TRANSPORT PROTEIN / BmrA ABC transporter complex with ATP-Mg multidrug resistance | |||||||||||||||||||||
Function / homology | ![]() ATPase-coupled lipid transmembrane transporter activity / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / ABC-type transporter activity / transmembrane transport / response to antibiotic / ATP hydrolysis activity / ATP binding / plasma membrane Similarity search - Function | |||||||||||||||||||||
Biological species | ![]() ![]() | |||||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å | |||||||||||||||||||||
![]() | Gobet, A. / Schoehn, G. / Falson, P. / Chaptal, V. | |||||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Substrate-bound and substrate-free outward-facing structures of a multidrug ABC exporter. Authors: Vincent Chaptal / Veronica Zampieri / Benjamin Wiseman / Cédric Orelle / Juliette Martin / Kim-Anh Nguyen / Alexia Gobet / Margot Di Cesare / Sandrine Magnard / Waqas Javed / Jad Eid / ...Authors: Vincent Chaptal / Veronica Zampieri / Benjamin Wiseman / Cédric Orelle / Juliette Martin / Kim-Anh Nguyen / Alexia Gobet / Margot Di Cesare / Sandrine Magnard / Waqas Javed / Jad Eid / Arnaud Kilburg / Marine Peuchmaur / Julien Marcoux / Luca Monticelli / Martin Hogbom / Guy Schoehn / Jean-Michel Jault / Ahcène Boumendjel / Pierre Falson / ![]() ![]() Abstract: Multidrug ABC transporters translocate drugs across membranes by a mechanism for which the molecular features of drug release are so far unknown. Here, we resolved three ATP-Mg-bound outward-facing ...Multidrug ABC transporters translocate drugs across membranes by a mechanism for which the molecular features of drug release are so far unknown. Here, we resolved three ATP-Mg-bound outward-facing conformations of the (homodimeric) BmrA by x-ray crystallography and single-particle cryo-electron microscopy (EM) in detergent solution, one of them with rhodamine 6G (R6G), a substrate exported by BmrA when overexpressed in . Two R6G molecules bind to the drug-binding cavity at the level of the outer leaflet, between transmembrane (TM) helices 1-2 of one monomer and TM5'-6' of the other. They induce a rearrangement of TM1-2, highlighting a local flexibility that we confirmed by hydrogen/deuterium exchange and molecular dynamics simulations. In the absence of R6G, simulations show a fast postrelease occlusion of the cavity driven by hydrophobicity, while when present, R6G can move within the cavity, maintaining it open. | |||||||||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 276.9 KB | Display | ![]() |
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PDB format | ![]() | 211.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 43.4 KB | Display | |
Data in CIF | ![]() | 63.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 13095MC ![]() 4749C ![]() 6r72C ![]() 6r81C ![]() 7bg4C C: citing same article ( M: map data used to model this data |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 65489.824 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Strain: 168 / Gene: bmrA, yvcC, BSU34820 / Production host: ![]() ![]() References: UniProt: O06967, Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate #2: Chemical | #3: Chemical | Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Complex of BmrA with ATP-Mg / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT | |||||||||||||||||||||||||
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Molecular weight | Value: 0.13 MDa / Experimental value: NO | |||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | |||||||||||||||||||||||||
Buffer solution | pH: 7.5 | |||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||||||||||||
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: C-flat-1.2/1.3 | |||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: TFS KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: OTHER / Cs: 2.7 mm |
Image recording | Average exposure time: 5 sec. / Electron dose: 37.95 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 4400 |
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Processing
Software | Name: PHENIX / Version: 1.14_3260: / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: NONE | |||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C2 (2 fold cyclic) | |||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 327764 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL | |||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 6R81 Pdb chain-ID: A / Accession code: 6R81 / Pdb chain residue range: 1-600 / Source name: PDB / Type: experimental model | |||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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