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- PDB-6t7s: MexB structure solved by cryo-EM in nanodisc in absence of its pr... -
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Basic information
Entry | Database: PDB / ID: 6t7s | ||||||
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Title | MexB structure solved by cryo-EM in nanodisc in absence of its protein partners | ||||||
![]() | Efflux pump membrane transporter | ||||||
![]() | ANTIMICROBIAL PROTEIN / transporter / efflux / proton motive force / bacterial resistance | ||||||
Function / homology | ![]() efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / transmembrane transport / response to antibiotic / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.5 Å | ||||||
![]() | Glavier, M. / Schoehn, G. / Taveau, J.C. / Phan, G. / Daury, L. / Lambert, O. / Broutin, I. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Antibiotic export by MexB multidrug efflux transporter is allosterically controlled by a MexA-OprM chaperone-like complex. Authors: Marie Glavier / Dhenesh Puvanendran / Dimitri Salvador / Marion Decossas / Gilles Phan / Cyril Garnier / Elisa Frezza / Quentin Cece / Guy Schoehn / Martin Picard / Jean-Christophe Taveau / ...Authors: Marie Glavier / Dhenesh Puvanendran / Dimitri Salvador / Marion Decossas / Gilles Phan / Cyril Garnier / Elisa Frezza / Quentin Cece / Guy Schoehn / Martin Picard / Jean-Christophe Taveau / Laetitia Daury / Isabelle Broutin / Olivier Lambert / ![]() Abstract: The tripartite multidrug efflux system MexAB-OprM is a major actor in Pseudomonas aeruginosa antibiotic resistance by exporting a large variety of antimicrobial compounds. Crystal structures of MexB ...The tripartite multidrug efflux system MexAB-OprM is a major actor in Pseudomonas aeruginosa antibiotic resistance by exporting a large variety of antimicrobial compounds. Crystal structures of MexB and of its Escherichia coli homolog AcrB had revealed asymmetric trimers depicting a directional drug pathway by a conformational interconversion (from Loose and Tight binding pockets to Open gate (LTO) for drug exit). It remains unclear how MexB acquires its LTO form. Here by performing functional and cryo-EM structural investigations of MexB at various stages of the assembly process, we unveil that MexB inserted in lipid membrane is not set for active transport because it displays an inactive LTC form with a Closed exit gate. In the tripartite complex, OprM and MexA form a corset-like platform that converts MexB into the active form. Our findings shed new light on the resistance nodulation cell division (RND) cognate partners which act as allosteric factors eliciting the functional drug extrusion. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 519.5 KB | Display | ![]() |
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PDB format | ![]() | 421.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 975.2 KB | Display | ![]() |
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Full document | ![]() | 1003.9 KB | Display | |
Data in XML | ![]() | 85.5 KB | Display | |
Data in CIF | ![]() | 129.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 10371MC ![]() 6ta5C ![]() 6ta6C M: map data used to model this data C: citing same article ( |
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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: 113706.008 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: mexB, mexB_1, C0044_03030, DZ934_11475, E4V10_16065, IPC3_09885, IPC669_14600, PAERUG_E15_London_28_01_14_02845, PAMH19_0483, RW109_RW109_01030 Production host: ![]() ![]() |
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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: MexB / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 42 e/Å2 / Film or detector model: GATAN K2 QUANTUM (4k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 4.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 41604 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
Displacement parameters | Biso mean: 239.16 Å2 | ||||||||||||||||||||||||
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