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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-10395 | |||||||||
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Title | MexA-MexB cryoEM map | |||||||||
![]() | Average map of the three classes aligned on MexB | |||||||||
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Function / homology | ![]() response to chemical / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / transmembrane transporter activity / cell outer membrane / protein homooligomerization / transmembrane transport / response to antibiotic / identical protein binding / membrane / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
![]() | Glavier M / Puvanendran D / Salvador D / Decossas M / Phan G / Garnier C / Frezza E / Cece Q / Schoehn G / Picard M ...Glavier M / Puvanendran D / Salvador D / Decossas M / Phan G / Garnier C / Frezza E / Cece Q / Schoehn G / Picard M / Taveau J-C / Daury L / Broutin I / Lambert O | |||||||||
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
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 360.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 12.8 KB 12.8 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 18 KB | Display | ![]() |
Images | ![]() | 30.9 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6ta6MC ![]() 6t7sC ![]() 6ta5C M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Average map of the three classes aligned on MexB | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.36 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : MexAB complex in nanodisc interacting with OprM molecules
Entire | Name: MexAB complex in nanodisc interacting with OprM molecules |
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Components |
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-Supramolecule #1: MexAB complex in nanodisc interacting with OprM molecules
Supramolecule | Name: MexAB complex in nanodisc interacting with OprM molecules type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
-Macromolecule #1: MexB
Macromolecule | Name: MexB / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Sequence | String: MSKFFIDRPI FAWVIALVIM LAGGLSILSL PVNQYPAIAP PAIAVQVSYP GASAETVQDT VVQVIEQQM NGIDNLRYIS SESNSDGSMT ITVTFEQGTD PDIAQVQVQN KLQLATPLLP Q EVQRQGIR VTKAVKNFLM VVGVVSTDGS MTKEDLSNYI VSNIQDPLSR ...String: MSKFFIDRPI FAWVIALVIM LAGGLSILSL PVNQYPAIAP PAIAVQVSYP GASAETVQDT VVQVIEQQM NGIDNLRYIS SESNSDGSMT ITVTFEQGTD PDIAQVQVQN KLQLATPLLP Q EVQRQGIR VTKAVKNFLM VVGVVSTDGS MTKEDLSNYI VSNIQDPLSR TKGVGDFQVF GS QYSMRIW LDPAKLNSYQ LTPGDVSSAI QAQNVQISSG QLGGLPAVKG QQLNATIIGK TRL QTAEQF ENILLKVNPD GSQVRLKDVA DVGLGGQDYS INAQFNGSPA SGIAIKLATG ANAL DTAKA IRQTIANLEP FMPQGMKVVY PYDTTPVVSA SIHEVVKTLG EAILLVFLVM YLFLQ NFRA TLIPTIAVPV VLLGTFGVLA AFGFSINTLT MFGMVLAIGL LVDDAIVVVE NVERVM AEE GLSPREAARK SMGQIQGALV GIAMVLSAVF LPMAFFGGST GVIYRQFSIT IVSAMAL SV IVALILTPAL CATMLKPIEK GDHGEHKGGF FGWFNRMFLS TTHGYERGVA SILKHRAP Y LLIYVVIVAG MIWMFTRIPT AFLPDEDQGV LFAQVQTPPG SSAERTQVVV DSMREYLLE KESSSVSSVF TVTGFNFAGR GQSSGMAFIM LKPWEERPGG ENSVFELAKR AQMHFFSFKD AMVFAFAPP SVLELGNATG FDLFLQDQAG VGHEVLLQAR NKFLMLAAQN PALQRVRPNG M SDEPQYKL EIDDEKASAL GVSLADINST VSIAWGSSYV NDFIDRGRVK RVYLQGRPDA RM NPDDLSK WYVRNDKGEM VPFNAFATGK WEYGSPKLER YNGVPAMEIL GEPAPGLSSG DAM AAVEEI VKQLPKGVGY SWTGLSYEER LSGSQAPALY ALSLLVVFLC LAALYESWSI PFSV MLVVP LGVIGALLAT SMRGLSNDVF FQVGLLTTIG LSAKNAILIV EFAKELHEQG KGIVE AAIE ACRMRLRPIV MTSLAFILGV VPLAISTGAG SGSQHAIGTG VIGGMVTATV LAIFWV PLF YVAVSTLFKD EASKQQASVE KGQ |
-Macromolecule #2: MexA
Macromolecule | Name: MexA / type: protein_or_peptide / ID: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Sequence | String: MQRTPAMRVL VPALLVAISA LSGCGKSEAP PPAQTPEVGI VTLEAQTVTL NTELPGRTNA FRIAEVRPQ VNGIILKRLF KEGSDVKAGQ QLYQIDPATY EADYQSAQAN LASTQEQAQR Y KLLVADQA VSKQQYADAN AAYLQSKAAV EQARINLRYT KVLSPISGRI ...String: MQRTPAMRVL VPALLVAISA LSGCGKSEAP PPAQTPEVGI VTLEAQTVTL NTELPGRTNA FRIAEVRPQ VNGIILKRLF KEGSDVKAGQ QLYQIDPATY EADYQSAQAN LASTQEQAQR Y KLLVADQA VSKQQYADAN AAYLQSKAAV EQARINLRYT KVLSPISGRI GRSAVTEGAL VT NGQANAM ATVQQLDPIY VDVTQPSTAL LRLRRELASG QLERAGDNAA KVSLKLEDGS QYP LEGRLE FSEVSVDEGT GSVTIRAVFP NPNNELLPGM FVHAQLQEGV KQKAILAPQQ GVTR DLKGQ ATALVVNAQN KVELRVIKAD RVIGDKWLVT EGLNAGDKII TEGLQFVQPG VEVKT VPAK NVASAQKADA APAKTDSKG |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Average electron dose: 42.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |