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Open data
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Basic information
Entry | Database: PDB / ID: 7nez | ||||||
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Title | Structure of topotecan-bound ABCG2 | ||||||
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Function / homology | ![]() biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / renal urate salt excretion / sphingolipid transporter activity / urate metabolic process / urate transmembrane transporter activity / Abacavir transmembrane transport / organic anion transport ...biotin transmembrane transporter activity / biotin transport / riboflavin transport / riboflavin transmembrane transporter activity / renal urate salt excretion / sphingolipid transporter activity / urate metabolic process / urate transmembrane transporter activity / Abacavir transmembrane transport / organic anion transport / external side of apical plasma membrane / sphingolipid biosynthetic process / organic anion transmembrane transporter activity / Sphingolipid de novo biosynthesis / xenobiotic transport across blood-brain barrier / export across plasma membrane / ABC-type xenobiotic transporter / Paracetamol ADME / transepithelial transport / Ciprofloxacin ADME / cellular detoxification / ABC-type xenobiotic transporter activity / NFE2L2 regulating MDR associated enzymes / ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | ||||||
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![]() | Kowal, J. / Locher, K. / Ni, D. / Stahlberg, H. | ||||||
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![]() | ![]() Title: Structural Basis of Drug Recognition by the Multidrug Transporter ABCG2. Authors: Julia Kowal / Dongchun Ni / Scott M Jackson / Ioannis Manolaridis / Henning Stahlberg / Kaspar P Locher / ![]() Abstract: ABCG2 is an ATP-binding cassette (ABC) transporter whose function affects the pharmacokinetics of drugs and contributes to multidrug resistance of cancer cells. While its interaction with the ...ABCG2 is an ATP-binding cassette (ABC) transporter whose function affects the pharmacokinetics of drugs and contributes to multidrug resistance of cancer cells. While its interaction with the endogenous substrate estrone-3-sulfate (ES) has been elucidated at a structural level, the recognition and recruitment of exogenous compounds is not understood at sufficiently high resolution. Here we present three cryo-EM structures of nanodisc-reconstituted, human ABCG2 bound to anticancer drugs tariquidar, topotecan and mitoxantrone. To enable structural insight at high resolution, we used Fab fragments of the ABCG2-specific monoclonal antibody 5D3, which binds to the external side of the transporter but does not interfere with drug-induced stimulation of ATPase activity. We observed that the binding pocket of ABCG2 can accommodate a single tariquidar molecule in a C-shaped conformation, similar to one of the two tariquidar molecules bound to ABCB1, where tariquidar acts as an inhibitor. We also found single copies of topotecan and mitoxantrone bound between key phenylalanine residues. Mutagenesis experiments confirmed the functional importance of two residues in the binding pocket, F439 and N436. Using 3D variability analyses, we found a correlation between substrate binding and reduced dynamics of the nucleotide binding domains (NBDs), suggesting a structural explanation for drug-induced ATPase stimulation. Our findings provide additional insight into how ABCG2 differentiates between inhibitors and substrates and may guide a rational design of new modulators and substrates. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 283.8 KB | Display | ![]() |
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PDB format | ![]() | 233.2 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 12295MC ![]() 7neqC ![]() 7nfdC C: citing same article ( M: map data used to model this data |
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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: 72385.852 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() References: UniProt: Q9UNQ0, ABC-type xenobiotic transporter #2: Antibody | Mass: 23594.016 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() ![]() #3: Antibody | Mass: 23843.633 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() ![]() ![]() #4: Chemical | ChemComp-TTC / ( | ![]() #5: Sugar | ChemComp-NAG / ![]() Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: ![]() |
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Sample preparation
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Molecular weight | Value: 0.25 MDa / Experimental value: YES | ||||||||||||||||||||||||
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Buffer solution | pH: 7.5 | ||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied![]() ![]() | ||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||
Vitrification![]() | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE |
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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![]() |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 62 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
EM imaging optics | Energyfilter name![]() |
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Processing
Software | Name: PHENIX / Version: 1.16_3549: / Classification: refinement | ||||||||||||||||||||||||
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EM software |
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CTF correction![]() | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry![]() | ||||||||||||||||||||||||
3D reconstruction![]() | Resolution: 3.39 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 133832 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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