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Open data
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Basic information
Entry | Database: PDB / ID: 8pmd | ||||||||||||
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Title | Nucleotide-bound BSEP in nanodiscs | ||||||||||||
![]() | Bile salt export pump | ||||||||||||
![]() | PROTEIN TRANSPORT / Transport / Nucleotide / Nanodiscs | ||||||||||||
Function / homology | ![]() canalicular bile acid transmembrane transporter activity / positive regulation of bile acid secretion / Defective ABCB11 causes PFIC2 and BRIC2 / canalicular bile acid transport / intracellular canaliculus / xenobiotic export from cell / regulation of fatty acid beta-oxidation / ABC-type bile acid transporter activity / regulation of bile acid metabolic process / bile acid transmembrane transporter activity ...canalicular bile acid transmembrane transporter activity / positive regulation of bile acid secretion / Defective ABCB11 causes PFIC2 and BRIC2 / canalicular bile acid transport / intracellular canaliculus / xenobiotic export from cell / regulation of fatty acid beta-oxidation / ABC-type bile acid transporter activity / regulation of bile acid metabolic process / bile acid transmembrane transporter activity / ABC-type oligopeptide transporter activity / xenobiotic transmembrane transport / bile acid biosynthetic process / phospholipid homeostasis / intercellular canaliculus / bile acid metabolic process / bile acid and bile salt transport / ABC-type xenobiotic transporter activity / Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate / bile acid signaling pathway / lipid homeostasis / carbohydrate transmembrane transporter activity / Synthesis of bile acids and bile salts via 7alpha-hydroxycholesterol / Recycling of bile acids and salts / xenobiotic metabolic process / fatty acid metabolic process / cholesterol homeostasis / response to organic cyclic compound / recycling endosome / transmembrane transport / response to estrogen / recycling endosome membrane / response to ethanol / response to oxidative stress / protein ubiquitination / endosome / apical plasma membrane / Golgi membrane / cell surface / ATP hydrolysis activity / extracellular exosome / ATP binding / plasma membrane Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.95 Å | ||||||||||||
![]() | Liu, H. / Irobalieva, R.N. / Kowal, J. / Ni, D. / Nosol, K. / Bang-Sorensen, R. / Lancien, L. / Stahlberg, H. / Stieger, B. / Locher, K.P. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis of bile salt extrusion and small-molecule inhibition in human BSEP. Authors: Hongtao Liu / Rossitza N Irobalieva / Julia Kowal / Dongchun Ni / Kamil Nosol / Rose Bang-Sørensen / Loïck Lancien / Henning Stahlberg / Bruno Stieger / Kaspar P Locher / ![]() Abstract: BSEP (ABCB11) is an ATP-binding cassette transporter that is expressed in hepatocytes and extrudes bile salts into the canaliculi of the liver. BSEP dysfunction, caused by mutations or induced by ...BSEP (ABCB11) is an ATP-binding cassette transporter that is expressed in hepatocytes and extrudes bile salts into the canaliculi of the liver. BSEP dysfunction, caused by mutations or induced by drugs, is frequently associated with severe cholestatic liver disease. We report the cryo-EM structure of glibenclamide-bound human BSEP in nanodiscs, revealing the basis of small-molecule inhibition. Glibenclamide binds the apex of a central binding pocket between the transmembrane domains, preventing BSEP from undergoing conformational changes, and thus rationalizing the reduced uptake of bile salts. We further report two high-resolution structures of BSEP trapped in distinct nucleotide-bound states by using a catalytically inactivated BSEP variant (BSEP) to visualize a pre-hydrolysis state, and wild-type BSEP trapped by vanadate to visualize a post-hydrolysis state. Our studies provide structural and functional insight into the mechanism of bile salt extrusion and into small-molecule inhibition of BSEP, which may rationalize drug-induced liver toxicity. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 234.7 KB | Display | ![]() |
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PDB format | ![]() | 181.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 45 KB | Display | |
Data in CIF | ![]() | 64.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 17759MC ![]() 8pm6C ![]() 8pmjC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 146556.406 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() References: UniProt: O95342, Translocases; Catalysing the translocation of other compounds; Linked to the hydrolysis of a nucleoside triphosphate | ||||||
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#2: Chemical | #3: Chemical | #4: Water | ChemComp-HOH / | Has ligand of interest | Y | |
-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: Nucleotide-bound BSEP in nanodiscs / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.146 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | 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 / Nominal defocus max: 2400 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm |
Specimen holder | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 48 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 2.95 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 126524 / Symmetry type: POINT | ||||||||||||||||||||||||
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