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- PDB-6hco: Cryo-EM structure of the ABCG2 E211Q mutant bound to estrone 3-su... -
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Basic information
Entry | Database: PDB / ID: 6hco | |||||||||
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Title | Cryo-EM structure of the ABCG2 E211Q mutant bound to estrone 3-sulfate and 5D3-Fab | |||||||||
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![]() | MEMBRANE PROTEIN / Multidrug transporter / cancer | |||||||||
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 / Sphingolipid de novo biosynthesis / organic anion transmembrane transporter activity / xenobiotic transport across blood-brain barrier / transepithelial transport / export across plasma membrane / ABC-type xenobiotic transporter / Paracetamol ADME / Ciprofloxacin ADME / NFE2L2 regulating MDR associated enzymes / ABC-type xenobiotic transporter activity / Differentiation of keratinocytes in interfollicular epidermis in mammalian skin / cellular detoxification / Heme biosynthesis / Heme degradation / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / transport across blood-brain barrier / ATPase-coupled transmembrane transporter activity / brush border membrane / Iron uptake and transport / mitochondrial membrane / transmembrane transport / apical plasma membrane / membrane raft / protein homodimerization activity / ATP hydrolysis activity / nucleoplasm / ATP binding / identical protein binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.58 Å | |||||||||
![]() | Manolaridis, I. / Jackson, S.M. / Taylor, N.M.I. / Kowal, J. / Stahlberg, H. / Locher, K.P. | |||||||||
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![]() | ![]() Title: Cryo-EM structures of a human ABCG2 mutant trapped in ATP-bound and substrate-bound states. Authors: Ioannis Manolaridis / Scott M Jackson / Nicholas M I Taylor / Julia Kowal / Henning Stahlberg / Kaspar P Locher / ![]() ![]() Abstract: ABCG2 is a transporter protein of the ATP-binding-cassette (ABC) family that is expressed in the plasma membrane in cells of various tissues and tissue barriers, including the blood-brain, blood- ...ABCG2 is a transporter protein of the ATP-binding-cassette (ABC) family that is expressed in the plasma membrane in cells of various tissues and tissue barriers, including the blood-brain, blood-testis and maternal-fetal barriers. Powered by ATP, it translocates endogenous substrates, affects the pharmacokinetics of many drugs and protects against a wide array of xenobiotics, including anti-cancer drugs. Previous studies have revealed the architecture of ABCG2 and the structural basis of its inhibition by small molecules and antibodies. However, the mechanisms of substrate recognition and ATP-driven transport are unknown. Here we present high-resolution cryo-electron microscopy (cryo-EM) structures of human ABCG2 in a substrate-bound pre-translocation state and an ATP-bound post-translocation state. For both structures, we used a mutant containing a glutamine replacing the catalytic glutamate (ABCG2), which resulted in reduced ATPase and transport rates and facilitated conformational trapping for structural studies. In the substrate-bound state, a single molecule of estrone-3-sulfate (ES) is bound in a central, hydrophobic and cytoplasm-facing cavity about halfway across the membrane. Only one molecule of ES can bind in the observed binding mode. In the ATP-bound state, the substrate-binding cavity has collapsed while an external cavity has opened to the extracellular side of the membrane. The ATP-induced conformational changes include rigid-body shifts of the transmembrane domains, pivoting of the nucleotide-binding domains (NBDs), and a change in the relative orientation of the NBD subdomains. Mutagenesis and in vitro characterization of transport and ATPase activities demonstrate the roles of specific residues in substrate recognition, including a leucine residue that forms a 'plug' between the two cavities. Our results show how ABCG2 harnesses the energy of ATP binding to extrude ES and other substrates, and suggest that the size and binding affinity of compounds are important for distinguishing substrates from inhibitors. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 287.8 KB | Display | ![]() |
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PDB format | ![]() | 228.1 KB | Display | ![]() |
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-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 49.1 KB | Display | |
Data in CIF | ![]() | 72.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 0196MC ![]() 0190C ![]() 6hbuC ![]() 6hzmC 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: 73394.758 Da / Num. of mol.: 2 / Mutation: E211Q Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #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: Polysaccharide | Source method: isolated from a genetically manipulated source #5: Chemical | ChemComp-FY5 / | |
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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
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Buffer solution | pH: 7.5 | ||||||||||||||||||||||||
Specimen | Conc.: 0.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / 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 |
Image recording | Average exposure time: 0.2 sec. / Electron dose: 100 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 3984 |
Image scans | Movie frames/image: 50 |
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Processing
Software | Name: PHENIX / Version: 1.12_2829: / Classification: refinement | ||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry: C2 (2 fold cyclic) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.58 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 42790 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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