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- PDB-6csx: Single particles Cryo-EM structure of AcrB D407A associated with ... -

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Basic information

Entry
Database: PDB / ID: 6csx
TitleSingle particles Cryo-EM structure of AcrB D407A associated with lipid bilayer at 3.0 Angstrom
ComponentsMultidrug efflux pump subunit AcrB
KeywordsTRANSPORT PROTEIN / AcrB / Native cell membrane nanoparticles / SMA / lipid bilayer
Function / homology
Function and homology information


xenobiotic detoxification by transmembrane export across the cell outer membrane / efflux pump complex / periplasmic side of plasma membrane / xenobiotic transmembrane transporter activity / efflux transmembrane transporter activity / outer membrane-bounded periplasmic space / membrane / identical protein binding / plasma membrane
Similarity search - Function
Hydrophobe/amphiphile efflux-1 HAE1 / Acriflavin resistance protein / Multidrug efflux transporter AcrB TolC docking domain, DN/DC subdomains / AcrB/AcrD/AcrF family
Similarity search - Domain/homology
DODECANE / PHOSPHATIDYLETHANOLAMINE / Multidrug efflux pump subunit AcrB
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsQiu, W. / Fu, Z. / Guo, Y.
Funding support United States, 1items
OrganizationGrant numberCountry
Other governmentStartup United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2018
Title: Structure and activity of lipid bilayer within a membrane-protein transporter.
Authors: Weihua Qiu / Ziao Fu / Guoyan G Xu / Robert A Grassucci / Yan Zhang / Joachim Frank / Wayne A Hendrickson / Youzhong Guo /
Abstract: Membrane proteins function in native cell membranes, but extraction into isolated particles is needed for many biochemical and structural analyses. Commonly used detergent-extraction methods destroy ...Membrane proteins function in native cell membranes, but extraction into isolated particles is needed for many biochemical and structural analyses. Commonly used detergent-extraction methods destroy naturally associated lipid bilayers. Here, we devised a detergent-free method for preparing cell-membrane nanoparticles to study the multidrug exporter AcrB, by cryo-EM at 3.2-Å resolution. We discovered a remarkably well-organized lipid-bilayer structure associated with transmembrane domains of the AcrB trimer. This bilayer patch comprises 24 lipid molecules; inner leaflet chains are packed in a hexagonal array, whereas the outer leaflet has highly irregular but ordered packing. Protein side chains interact with both leaflets and participate in the hexagonal pattern. We suggest that the lipid bilayer supports and harmonizes peristaltic motions through AcrB trimers. In AcrB D407A, a putative proton-relay mutant, lipid bilayer buttresses protein interactions lost in crystal structures after detergent-solubilization. Our detergent-free system preserves lipid-protein interactions for visualization and should be broadly applicable.
History
DepositionMar 21, 2018Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 5, 2018Provider: repository / Type: Initial release
Revision 1.1Dec 19, 2018Group: Data collection / Database references
Category: citation / citation_author / pdbx_database_related
Item: _citation.journal_abbrev / _citation.pdbx_database_id_PubMed ..._citation.journal_abbrev / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name / _pdbx_database_related.content_type / _pdbx_database_related.db_id
Revision 1.2Jan 2, 2019Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Mar 13, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
B: Multidrug efflux pump subunit AcrB
C: Multidrug efflux pump subunit AcrB
A: Multidrug efflux pump subunit AcrB
hetero molecules


Theoretical massNumber of molelcules
Total (without water)357,46022
Polymers344,0773
Non-polymers13,38319
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy, Single particles analysis using cryo-EM
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Multidrug efflux pump subunit AcrB / AcrAB-TolC multidrug efflux pump subunit AcrB / Acridine resistance protein B


Mass: 114692.289 Da / Num. of mol.: 3 / Mutation: D407A
Source method: isolated from a genetically manipulated source
Details: AcrB, lipid bilayer
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: acrB, acrE, b0462, JW0451 / Production host: Escherichia coli (E. coli) / References: UniProt: P31224
#2: Chemical
ChemComp-PTY / PHOSPHATIDYLETHANOLAMINE / Phosphatidylethanolamine


Mass: 734.039 Da / Num. of mol.: 18 / Source method: obtained synthetically / Formula: C40H80NO8P / Comment: phospholipid*YM
#3: Chemical ChemComp-D12 / DODECANE / Dodecane


Mass: 170.335 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C12H26

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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: Lipid bilayer in AcrB / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.8
SpecimenConc.: 0.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD
VitrificationCryogen name: ETHANE-PROPANE

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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 FIELDBright-field microscopy
Image recordingElectron dose: 45 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 41190 / Symmetry type: POINT

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