+Open data
-Basic information
Entry | Database: PDB / ID: 7b8r | ||||||||||||
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Title | Doxycycline bound structure of bacterial efflux pump. | ||||||||||||
Components |
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Keywords | TRANSPORT PROTEIN / RND transporter / multidrug resistance / efflux pump / antibiotics | ||||||||||||
Function / homology | Function and homology information xenobiotic detoxification by transmembrane export across the cell outer membrane / efflux pump complex / periplasmic side of plasma membrane / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / outer membrane-bounded periplasmic space / identical protein binding / membrane / plasma membrane Similarity search - Function | ||||||||||||
Biological species | Escherichia coli (E. coli) synthetic construct (others) | ||||||||||||
Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.1 Å | ||||||||||||
Authors | Wilhelm, J. / Sjuts, H. / Pos, K.M. | ||||||||||||
Funding support | Germany, European Union, 3items
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Citation | Journal: Nat Commun / Year: 2021 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
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7b8r.cif.gz | 441 KB | Display | PDBx/mmCIF format |
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PDB format | pdb7b8r.ent.gz | 356.1 KB | Display | PDB format |
PDBx/mmJSON format | 7b8r.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 7b8r_validation.pdf.gz | 1.2 MB | Display | wwPDB validaton report |
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Full document | 7b8r_full_validation.pdf.gz | 1.2 MB | Display | |
Data in XML | 7b8r_validation.xml.gz | 79.3 KB | Display | |
Data in CIF | 7b8r_validation.cif.gz | 112 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/b8/7b8r ftp://data.pdbj.org/pub/pdb/validation_reports/b8/7b8r | HTTPS FTP |
-Related structure data
Related structure data | 7b8pC 7b8qC 7b8sC 7b8tC 5en5S S: Starting model for refinement C: citing same article (ref.) |
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Similar structure data |
-Links
-Assembly
Deposited unit |
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1 |
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Unit cell |
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-Components
#1: Protein | Mass: 66099.047 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source 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: Protein | Mass: 18317.566 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli) #3: Chemical | ChemComp-PEG / #4: Chemical | #5: Water | ChemComp-HOH / | Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: X-RAY DIFFRACTION / Number of used crystals: 1 |
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-Sample preparation
Crystal | Density Matthews: 2.71 Å3/Da / Density % sol: 54.67 % |
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Crystal grow | Temperature: 291 K / Method: vapor diffusion, hanging drop / Details: 0.1 M MES pH 6.5, 0.21 M NaCl, 11.5% PEG4000 |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: SYNCHROTRON / Site: PETRA III, EMBL c/o DESY / Beamline: P13 (MX1) / Wavelength: 0.976253 Å |
Detector | Type: DECTRIS PILATUS 6M-F / Detector: PIXEL / Date: Sep 12, 2018 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.976253 Å / Relative weight: 1 |
Reflection | Resolution: 2.1→48.799 Å / Num. obs: 158834 / % possible obs: 98.81 % / Redundancy: 13.7 % / Biso Wilson estimate: 41.76 Å2 / CC1/2: 0.999 / Net I/σ(I): 14.87 |
Reflection shell | Resolution: 2.1→2.175 Å / Redundancy: 14.3 % / Mean I/σ(I) obs: 1.46 / Num. unique obs: 15593 / CC1/2: 0.65 / % possible all: 98.01 |
-Processing
Software |
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Refinement | Method to determine structure: MOLECULAR REPLACEMENT Starting model: 5EN5 Resolution: 2.1→48.799 Å / SU ML: 0.26 / Cross valid method: THROUGHOUT / σ(F): 1.34 / Phase error: 26.25 / Stereochemistry target values: ML
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso max: 111.01 Å2 / Biso mean: 51.4338 Å2 / Biso min: 23.45 Å2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: final / Resolution: 2.1→48.799 Å
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LS refinement shell | Refine-ID: X-RAY DIFFRACTION / Rfactor Rfree error: 0
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