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- PDB-9gsj: BmrA E504A in complex with Hoechst33342 -

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Basic information

Entry
Database: PDB / ID: 9gsj
TitleBmrA E504A in complex with Hoechst33342
ComponentsMultidrug resistance ABC transporter ATP-binding/permease protein BmrA
KeywordsMEMBRANE PROTEIN / transporter complex with Hoechst33342
Function / homology
Function and homology information


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
Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. ...Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Chem-HT1 / Multidrug resistance ABC transporter ATP-binding/permease protein BmrA
Similarity search - Component
Biological speciesBacillus subtilis (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsMoissonnier, L. / Zarkadas, E. / Schoehn, G. / Falson, P. / Chaptal, V.
Funding support France, 2items
OrganizationGrant numberCountry
Agence Nationale de la Recherche (ANR)ANR-19-CE11-0023-01 France
Agence Nationale de la Recherche (ANR)ANR-23-CE11-0031 France
CitationJournal: Nat Commun / Year: 2025
Title: Rhodamine6G and Hœchst33342 narrow BmrA conformational spectrum for a more efficient use of ATP.
Authors: A Gobet / L Moissonnier / E Zarkadas / S Magnard / E Bettler / J Martin / R Terreux / G Schoehn / C Orelle / J M Jault / P Falson / V Chaptal /
Abstract: Multidrug ABC transporters harness the energy of ATP binding and hydrolysis to translocate substrates out of the cell and detoxify them. While this involves a well-accepted alternating access ...Multidrug ABC transporters harness the energy of ATP binding and hydrolysis to translocate substrates out of the cell and detoxify them. While this involves a well-accepted alternating access mechanism, molecular details of this interplay are still elusive. Rhodamine6G binding on a catalytic inactive mutant of the homodimeric multidrug ABC transporter BmrA triggers a cooperative binding of ATP on the two identical nucleotide-binding-sites, otherwise michaelian. Here, we investigate this asymmetric behavior via a structural-enzymology approach, solving cryoEM structures of BmrA at defined ATP ratios, highlighting the plasticity of BmrA as it undergoes the transition from inward to outward facing conformations. Analysis of continuous heterogeneity within cryoEM data and structural dynamics, reveals that Rhodamine6G narrows the conformational spectrum explored by the nucleotide-binding domains. We observe the same behavior for the other drug Hœchst33342. Following on these findings, the effect of drug-binding showed an ATPase stimulation and a maximal transport activity of the wild-type protein at the concentration-range where the cooperative transition occurs. Altogether, these findings provide a description of the influence of drug binding on the ATP-binding sites through a change in conformational dynamics.
History
DepositionSep 16, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 5, 2025Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 5, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Multidrug resistance ABC transporter ATP-binding/permease protein BmrA
B: Multidrug resistance ABC transporter ATP-binding/permease protein BmrA
hetero molecules


Theoretical massNumber of molelcules
Total (without water)132,3994
Polymers131,4942
Non-polymers9052
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Multidrug resistance ABC transporter ATP-binding/permease protein BmrA


Mass: 65747.141 Da / Num. of mol.: 2 / Mutation: E504A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bacillus subtilis (bacteria) / Gene: bmrA / Production host: Escherichia coli (E. coli) / References: UniProt: O06967
#2: Chemical ChemComp-HT1 / 2'-(4-ETHOXYPHENYL)-5-(4-METHYL-1-PIPERAZINYL)-2,5'-BI-BENZIMIDAZOLE / HOECHST 33342


Mass: 452.551 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C27H28N6O / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: BmrA E504A in complex with Hoechst33342 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.13 MDa / Experimental value: NO
Source (natural)Organism: Bacillus subtilis (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenConc.: 4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: Membrane protein in detergent
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil
VitrificationInstrument: 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
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2400 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 49.6 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
4cryoSPARC4.5CTF correction
10cryoSPARC4.5initial Euler assignment
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 890304 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0039014
ELECTRON MICROSCOPYf_angle_d0.67212206
ELECTRON MICROSCOPYf_dihedral_angle_d8.0921268
ELECTRON MICROSCOPYf_chiral_restr0.041464
ELECTRON MICROSCOPYf_plane_restr0.0041524

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