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- PDB-7bcw: Structure of MsbA in Salipro with ADP vanadate -

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Basic information

Entry
Database: PDB / ID: 7bcw
TitleStructure of MsbA in Salipro with ADP vanadate
ComponentsATP-dependent lipid A-core flippase
KeywordsMEMBRANE PROTEIN / Lipid export MsbA
Function / homology
Function and homology information


MsbA transporter complex / lipopolysaccharide floppase activity / lipid translocation / ABC-type lipid A-core oligosaccharide transporter / lipopolysaccharide transport / ATPase-coupled lipid transmembrane transporter activity / ABC-type xenobiotic transporter activity / lipid transport / ATP-binding cassette (ABC) transporter complex / transmembrane transport ...MsbA transporter complex / lipopolysaccharide floppase activity / lipid translocation / ABC-type lipid A-core oligosaccharide transporter / lipopolysaccharide transport / ATPase-coupled lipid transmembrane transporter activity / ABC-type xenobiotic transporter activity / lipid transport / ATP-binding cassette (ABC) transporter complex / transmembrane transport / lipid binding / ATP hydrolysis activity / ATP binding / identical protein binding / membrane / plasma membrane
Similarity search - Function
Lipid A export ATP-binding/permease protein msbA family profile. / ABC transporter transmembrane region fold / ABC transporter type 1, transmembrane domain / ABC transporter, lipid A-core flippase, MsbA / 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 ...Lipid A export ATP-binding/permease protein msbA family profile. / ABC transporter transmembrane region fold / ABC transporter type 1, transmembrane domain / ABC transporter, lipid A-core flippase, MsbA / 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. / P-loop containing nucleotide triphosphate hydrolases / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Up-down Bundle / Rossmann fold / P-loop containing nucleoside triphosphate hydrolase / 3-Layer(aba) Sandwich / Mainly Alpha / Alpha Beta
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / Chem-POV / VANADATE ION / ATP-dependent lipid A-core flippase
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsTraore, D.A.K. / Tidow, H.
CitationJournal: FEBS J / Year: 2022
Title: Cryo-EM structure of MsbA in saposin-lipid nanoparticles (Salipro) provides insights into nucleotide coordination.
Authors: Dominique-Maurice Kehlenbeck / Daouda A K Traore / Inokentijs Josts / Simon Sander / Martine Moulin / Michael Haertlein / Sylvain Prevost / V Trevor Forsyth / Henning Tidow /
Abstract: The ATP-binding cassette transporter MsbA is a lipid flippase, translocating lipid A, glycolipids, and lipopolysaccharides from the inner to the outer leaflet of the inner membrane of Gram-negative ...The ATP-binding cassette transporter MsbA is a lipid flippase, translocating lipid A, glycolipids, and lipopolysaccharides from the inner to the outer leaflet of the inner membrane of Gram-negative bacteria. It has been used as a model system for time-resolved structural studies as several MsbA structures in different states and reconstitution systems (detergent/nanodiscs/peptidiscs) are available. However, due to the limited resolution of the available structures, detailed structural information on the bound nucleotides has remained elusive. Here, we have reconstituted MsbA in saposin A-lipoprotein nanoparticles (Salipro) and determined the structure of ADP-vanadate-bound MsbA by single-particle cryo-electron microscopy to 3.5 Å resolution. This procedure has resulted in significantly improved resolution and enabled us to model all side chains and visualise detailed ADP-vanadate interactions in the nucleotide-binding domains. The approach may be applicable to other dynamic membrane proteins.
History
DepositionDec 21, 2020Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 12, 2022Provider: repository / Type: Initial release
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Revision 1.1Jan 19, 2022Group: Database references / Category: citation / citation_author
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Revision 1.3Jul 10, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / em_admin / pdbx_initial_refinement_model
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Revision 1.4Jul 9, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details
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Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Assembly

Deposited unit
A: ATP-dependent lipid A-core flippase
B: ATP-dependent lipid A-core flippase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)135,62610
Polymers132,9732
Non-polymers2,6538
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area18240 Å2
ΔGint-133 kcal/mol
Surface area44420 Å2
MethodPISA

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Components

#1: Protein ATP-dependent lipid A-core flippase / Lipid A export ATP-binding/permease protein MsbA / Lipid flippase


Mass: 66486.664 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: msbA, b0914, JW0897 / Production host: Escherichia coli (E. coli)
References: UniProt: P60752, ABC-type lipid A-core oligosaccharide transporter
#2: Chemical ChemComp-VO4 / VANADATE ION


Mass: 114.939 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: VO4 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg
#5: Chemical ChemComp-POV / (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / POPC


Mass: 760.076 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C42H82NO8P / Comment: phospholipid*YM
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: MsbA in Salipro with ADP vanadate / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Escherichia coli (strain K12) (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenConc.: 0.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1
VitrificationCryogen name: ETHANE

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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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 40 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)
EM imaging opticsEnergyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV

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Processing

SoftwareName: PHENIX / Version: 1.18.2_3874: / Classification: refinement
EM software
IDNameVersionCategory
2EPUimage acquisition
4GctfCTF correction
9PHENIXmodel refinement
13cryoSPARC2.153D reconstruction
CTF correctionType: PHASE FLIPPING ONLY
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 83278 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingPDB-ID: 5TTP

5ttp


Pdb chain-ID: A / Accession code: 5TTP / Source name: PDB / Type: experimental model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 71.61 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0059153
ELECTRON MICROSCOPYf_angle_d0.66212374
ELECTRON MICROSCOPYf_dihedral_angle_d17.1991302
ELECTRON MICROSCOPYf_chiral_restr0.0441466
ELECTRON MICROSCOPYf_plane_restr0.0031552

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