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Open data
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Basic information
Entry | Database: PDB / ID: 7b8p | ||||||||||||||||||
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Title | Acinetobacter baumannii multidrug transporter AdeB in OOO state | ||||||||||||||||||
![]() | Efflux pump membrane transporter | ||||||||||||||||||
![]() | TRANSPORT PROTEIN / RND-transporter / multidrug transporter / antibiotic resistance / membrane protein | ||||||||||||||||||
Function / homology | Hydrophobe/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 / response to toxic substance / plasma membrane / Efflux pump membrane transporter![]() | ||||||||||||||||||
Biological species | ![]() | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.54 Å | ||||||||||||||||||
![]() | Ornik-Cha, A. / Reitz, J. / Seybert, A. / Frangakis, A. / Pos, K.M. | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural and functional analysis of the promiscuous AcrB and AdeB efflux pumps suggests different drug binding mechanisms. Authors: Alina Ornik-Cha / Julia Wilhelm / Jessica Kobylka / Hanno Sjuts / Attilio V Vargiu / Giuliano Malloci / Julian Reitz / Anja Seybert / Achilleas S Frangakis / Klaas M Pos / ![]() ![]() Abstract: Upon antibiotic stress Gram-negative pathogens deploy resistance-nodulation-cell division-type tripartite efflux pumps. These include a H/drug antiporter module that recognizes structurally diverse ...Upon antibiotic stress Gram-negative pathogens deploy resistance-nodulation-cell division-type tripartite efflux pumps. These include a H/drug antiporter module that recognizes structurally diverse substances, including antibiotics. Here, we show the 3.5 Å structure of subunit AdeB from the Acinetobacter baumannii AdeABC efflux pump solved by single-particle cryo-electron microscopy. The AdeB trimer adopts mainly a resting state with all protomers in a conformation devoid of transport channels or antibiotic binding sites. However, 10% of the protomers adopt a state where three transport channels lead to the closed substrate (deep) binding pocket. A comparison between drug binding of AdeB and Escherichia coli AcrB is made via activity analysis of 20 AdeB variants, selected on basis of side chain interactions with antibiotics observed in the AcrB periplasmic domain X-ray co-structures with fusidic acid (2.3 Å), doxycycline (2.1 Å) and levofloxacin (2.7 Å). AdeABC, compared to AcrAB-TolC, confers higher resistance to E. coli towards polyaromatic compounds and lower resistance towards antibiotic compounds. | ||||||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 511.3 KB | Display | ![]() |
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PDB format | ![]() | 415.3 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 12088MC ![]() 7b8qC ![]() 7b8rC ![]() 7b8sC ![]() 7b8tC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 115143.055 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: AYE / Gene: adeB, ABAYE1822 / Production host: ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Homotrimeric RND-transporter AdeB reconstituted in Salipro Type: COMPLEX / Entity ID: all / Source: RECOMBINANT | |||||||||||||||
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Molecular weight | Value: 0.345 MDa / Experimental value: NO | |||||||||||||||
Source (natural) | Organism: ![]() | |||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | |||||||||||||||
Buffer solution | pH: 8.5 | |||||||||||||||
Buffer component |
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Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||
Specimen support | Grid material: COPPER / Grid type: Quantifoil R1.2/1.3 | |||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Cs: 2.7 mm |
Specimen holder | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 60 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
Image scans | Movie frames/image: 48 |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||
Symmetry | Point symmetry: C3 (3 fold cyclic) | ||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.54 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 132346 / Symmetry type: POINT | ||||||||||||||||||||||||||||
Atomic model building | Space: REAL |