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- EMDB-20216: Cryo-EM structure of an Acinetobacter baumannii multidrug efflux pump -

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Basic information

Entry
Database: EMDB / ID: EMD-20216
TitleCryo-EM structure of an Acinetobacter baumannii multidrug efflux pump
Map dataAcinetobacter baumannii multidrug efflux pump
Sample
  • Organelle or cellular component: AdeB
    • Complex: RND transporter
      • Protein or peptide: Efflux pump membrane transporter
  • Ligand: PHOSPHATIDYLETHANOLAMINE
Keywordstransporter / MEMBRANE PROTEIN
Function / homologyHydrophobe/amphiphile efflux-1 HAE1 / Acriflavin resistance protein / Multidrug efflux transporter AcrB TolC docking domain, DN/DC subdomains / AcrB/AcrD/AcrF family / xenobiotic transport / efflux transmembrane transporter activity / plasma membrane / Efflux pump membrane transporter
Function and homology information
Biological speciesAcinetobacter baumannii (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.98 Å
AuthorsSu C-C
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: mBio / Year: 2019
Title: Cryo-Electron Microscopy Structure of an Acinetobacter baumannii Multidrug Efflux Pump.
Authors: Chih-Chia Su / Christopher E Morgan / Sekhar Kambakam / Malligarjunan Rajavel / Harry Scott / Wei Huang / Corey C Emerson / Derek J Taylor / Phoebe L Stewart / Robert A Bonomo / Edward W Yu /
Abstract: Resistance-nodulation-cell division multidrug efflux pumps are membrane proteins that catalyze the export of drugs and toxic compounds out of bacterial cells. Within the hydrophobe-amphiphile ...Resistance-nodulation-cell division multidrug efflux pumps are membrane proteins that catalyze the export of drugs and toxic compounds out of bacterial cells. Within the hydrophobe-amphiphile subfamily, these multidrug-resistant proteins form trimeric efflux pumps. The drug efflux process is energized by the influx of protons. Here, we use single-particle cryo-electron microscopy to elucidate the structure of the AdeB multidrug efflux pump embedded in lipidic nanodiscs to a resolution of 2.98 Å. We found that each AdeB molecule within the trimer preferentially takes the resting conformational state in the absence of substrates. We propose that proton influx and drug efflux are synchronized and coordinated within the transport cycle. is a successful human pathogen which has emerged as one of the most problematic and highly antibiotic-resistant Gram-negative bacteria worldwide. Multidrug efflux is a major mechanism that uses to counteract the action of multiple classes of antibiotics, such as β-lactams, tetracyclines, fluoroquinolones, and aminoglycosides. Here, we report a cryo-electron microscopy (cryo-EM) structure of the prevalent AdeB multidrug efflux pump, which indicates a plausible pathway for multidrug extrusion. Overall, our data suggest a mechanism for energy coupling that powers up this membrane protein to export antibiotics from bacterial cells. Our studies will ultimately inform an era in structure-guided drug design to combat multidrug resistance in these Gram-negative pathogens.
History
DepositionMay 10, 2019-
Header (metadata) releaseJun 19, 2019-
Map releaseJun 19, 2019-
UpdateMar 20, 2024-
Current statusMar 20, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 7
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 7
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6ows
  • Surface level: 5.5
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20216.png

Downloads & links

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Map

FileDownload / File: emd_20216.map.gz / Format: CCP4 / Size: 347.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationAcinetobacter baumannii multidrug efflux pump
Voxel sizeX=Y=Z: 1.06 Å
Density
Contour LevelBy AUTHOR: 5.5 / Movie #1: 7
Minimum - Maximum-25.351130999999999 - 53.617446999999999
Average (Standard dev.)-0.000000000000801 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions450450450
Spacing450450450
CellA=B=C: 476.99997 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.061.061.06
M x/y/z450450450
origin x/y/z0.0000.0000.000
length x/y/z477.000477.000477.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ450450450
MAP C/R/S321
start NC/NR/NS000
NC/NR/NS450450450
D min/max/mean-25.35153.617-0.000

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Supplemental data

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Additional map: Acinetobacter baumannii multidrug efflux pump

Fileemd_20216_additional.map
AnnotationAcinetobacter baumannii multidrug efflux pump
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : AdeB

EntireName: AdeB
Components
  • Organelle or cellular component: AdeB
    • Complex: RND transporter
      • Protein or peptide: Efflux pump membrane transporter
  • Ligand: PHOSPHATIDYLETHANOLAMINE

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Supramolecule #1: AdeB

SupramoleculeName: AdeB / type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Acinetobacter baumannii (bacteria)

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Supramolecule #2: RND transporter

SupramoleculeName: RND transporter / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Acinetobacter baumannii (bacteria)

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Macromolecule #1: Efflux pump membrane transporter

MacromoleculeName: Efflux pump membrane transporter / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Acinetobacter baumannii (bacteria)
Molecular weightTheoretical: 112.588297 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSQFFIRRPV FAWVIAIFII IFGLLSIPKL PIARFPSVAP PQVNISATYP GATAKTINDS VVTLIERELS GVKNLLYYSA TTDTSGTAE ITATFKPGTD VEMAQVDVQN KIKAVEARLP QVVRQQGLQV EASSSGFLML VGINSPNNQY SEVDLSDYLV R NVVEELKR ...String:
MSQFFIRRPV FAWVIAIFII IFGLLSIPKL PIARFPSVAP PQVNISATYP GATAKTINDS VVTLIERELS GVKNLLYYSA TTDTSGTAE ITATFKPGTD VEMAQVDVQN KIKAVEARLP QVVRQQGLQV EASSSGFLML VGINSPNNQY SEVDLSDYLV R NVVEELKR VEGVGKVQSF GAEKAMRIWV DPNKLVSYGL SISDVNNAIR ENNVEIAPGR LGDLPAEKGQ LITIPLSAQG QL SSLEQFK NISLKSKTNG SVIKLSDVAN VEIGSQAYNF AILENGKPAT AAAIQLSPGA NAVKTAEGVR AKIEELKLNL PEG MEFSIP YDTAPFVKIS IEKVIHTLLE AMVLVFIVMY LFLHNVRYTL IPAIVAPIAL LGTFTVMLLA GFSINVLTMF GMVL AIGII VDDAIVVVEN VERIMATEGL SPKDATSKAM KEITSPIIGI TLVLAAVFLP MAFASGSVGV IYKQFTLTMS VSILF SALL ALILTPALCA TILKPIDGHH QKKGFFAWFD RSFDKVTKKY ELMLLKIIKH TVPMMVIFLV ITGITFAGMK YWPTAF MPE EDQGWFMTSF QLPSDATAER TRNVVNQFEN NLKDNPDVKS NTAILGWGFS GAGQNVAVAF TTLKDFKERT SSASKMT SD VNSSMANSTE GETMAVLPPA IDELGTFSGF SLRLQDRANL GMPALLAAQD ELMAMAAKNK KFYMVWNEGL PQGDNISL K IDREKLSALG VKFSDVSDII STSMGSMYIN DFPNQGRMQQ VIVQVEAKSR MQLKDILNLK VMGSSGQLVS LSEVVTPQW NKAPQQYNRY NGRPSLSIAG IPNFDTSSGE AMREMEQLIA KLPKGIGYEW TGISLQEKQS ESQMAFLLGL SMLVVFLVLA ALYESWAIP LSVMLVVPLG IFGAIIAIMS RGLMNDVFFK IGLITIIGLS AKNAILIVEF AKMLKEEGMS LIEATVAAAK L RLRPILMT SLAFTCGVIP LVIATGASSE TQHALGTGVF GGMISATILA IFFVPVFFIF ILGAVEKLFS SKKKISS

UniProtKB: Efflux pump membrane transporter

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Macromolecule #2: PHOSPHATIDYLETHANOLAMINE

MacromoleculeName: PHOSPHATIDYLETHANOLAMINE / type: ligand / ID: 2 / Number of copies: 6 / Formula: PTY
Molecular weightTheoretical: 734.039 Da
Chemical component information

ChemComp-PTY:
PHOSPHATIDYLETHANOLAMINE / phospholipid*YM / Phosphatidylethanolamine

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation state2D array

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Sample preparation

Concentration0.2 mg/mL
BufferpH: 7.5
GridDetails: unspecified
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 1.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.98 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 2) / Number images used: 142676

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