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- PDB-7oz1: Cryo-EM structure of ABCG1 E242Q mutant with ATP and cholesteryl ... -
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Basic information
Entry | Database: PDB / ID: 7oz1 | |||||||||
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Title | Cryo-EM structure of ABCG1 E242Q mutant with ATP and cholesteryl hemisuccinate bound | |||||||||
![]() | Isoform 4 of ATP-binding cassette sub-family G member 1 | |||||||||
![]() | MEMBRANE PROTEIN / cholesterol / ABC transporter / ATP binding / inward-open | |||||||||
Function / homology | ![]() ABC-type sterol transporter activity / glycoprotein transport / cellular response to high density lipoprotein particle stimulus / intracellular cholesterol transport / toxin transmembrane transporter activity / ABC transporters in lipid homeostasis / floppase activity / positive regulation of cholesterol biosynthetic process / phosphatidylcholine floppase activity / phospholipid homeostasis ...ABC-type sterol transporter activity / glycoprotein transport / cellular response to high density lipoprotein particle stimulus / intracellular cholesterol transport / toxin transmembrane transporter activity / ABC transporters in lipid homeostasis / floppase activity / positive regulation of cholesterol biosynthetic process / phosphatidylcholine floppase activity / phospholipid homeostasis / high-density lipoprotein particle remodeling / phospholipid efflux / reverse cholesterol transport / cholesterol transfer activity / low-density lipoprotein particle remodeling / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / HDL remodeling / cholesterol efflux / regulation of cholesterol metabolic process / positive regulation of amyloid-beta formation / response to lipid / cholesterol binding / negative regulation of cholesterol storage / amyloid precursor protein catabolic process / negative regulation of macrophage derived foam cell differentiation / positive regulation of cholesterol efflux / NR1H3 & NR1H2 regulate gene expression linked to cholesterol transport and efflux / cholesterol metabolic process / : / cholesterol homeostasis / positive regulation of protein secretion / recycling endosome / phospholipid binding / transmembrane transport / ADP binding / endosome / protein heterodimerization activity / external side of plasma membrane / Golgi membrane / endoplasmic reticulum membrane / Golgi apparatus / protein homodimerization activity / ATP hydrolysis activity / mitochondrion / ATP binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4 Å | |||||||||
![]() | Skarda, L. / Kowal, J. / Locher, K.P. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of the Human Cholesterol Transporter ABCG1. Authors: Liga Skarda / Julia Kowal / Kaspar P Locher / ![]() Abstract: ABCG1 is an ATP binding cassette (ABC) transporter that removes excess cholesterol from peripheral tissues. Despite its role in preventing lipid accumulation and the development of cardiovascular and ...ABCG1 is an ATP binding cassette (ABC) transporter that removes excess cholesterol from peripheral tissues. Despite its role in preventing lipid accumulation and the development of cardiovascular and metabolic disease, the mechanism underpinning ABCG1-mediated cholesterol transport is unknown. Here we report a cryo-EM structure of human ABCG1 at 4 Å resolution in an inward-open state, featuring sterol-like density in the binding cavity. Structural comparison with the multidrug transporter ABCG2 and the sterol transporter ABCG5/G8 reveals the basis of mechanistic differences and distinct substrate specificity. Benzamil and taurocholate inhibited the ATPase activity of liposome-reconstituted ABCG1, whereas the ABCG2 inhibitor Ko143 did not. Based on the structural insights into ABCG1, we propose a mechanism for ABCG1-mediated cholesterol transport. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 204.8 KB | Display | ![]() |
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PDB format | ![]() | 169.1 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 | ![]() | 38.9 KB | Display | |
Data in CIF | ![]() | 51.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 13118MC 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: 75658.508 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() References: UniProt: P45844, Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate #2: Chemical | #3: Chemical | ChemComp-Y01 / #4: Chemical | Has ligand of interest | N | |
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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: Human ABCG1 with bound ATP and CHS / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT | ||||||||||||||||||||
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Molecular weight | Experimental value: NO | ||||||||||||||||||||
Source (natural) | Organism: ![]() | ||||||||||||||||||||
Source (recombinant) | Organism: ![]() | ||||||||||||||||||||
Buffer solution | pH: 7.5 | ||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||
Specimen support | Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||
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: TFS KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 1.76 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 17524 |
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Processing
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 39791 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
Displacement parameters | Biso mean: 41.31 Å2 | ||||||||||||||||||||||||
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