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- PDB-8hnc: Cryo-EM structure of human OATP1B1 in complex with bilirubin -

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Basic information

Entry
Database: PDB / ID: 8hnc
TitleCryo-EM structure of human OATP1B1 in complex with bilirubin
ComponentsSolute carrier organic anion transporter family member 1B1
KeywordsMEMBRANE PROTEIN / transporter / OATP1B1 / organic anion transporting peptide
Function / homology
Function and homology information


Defective SLCO1B1 causes hyperbilirubinemia, Rotor type (HBLRR) / Transport of organic anions / sodium-independent organic anion transport / sodium-independent organic anion transmembrane transporter activity / thyroid hormone transmembrane transporter activity / prostaglandin transmembrane transporter activity / Atorvastatin ADME / heme catabolic process / organic anion transport / organic anion transmembrane transporter activity ...Defective SLCO1B1 causes hyperbilirubinemia, Rotor type (HBLRR) / Transport of organic anions / sodium-independent organic anion transport / sodium-independent organic anion transmembrane transporter activity / thyroid hormone transmembrane transporter activity / prostaglandin transmembrane transporter activity / Atorvastatin ADME / heme catabolic process / organic anion transport / organic anion transmembrane transporter activity / bile acid transmembrane transporter activity / bile acid and bile salt transport / Heme degradation / monoatomic ion transport / Recycling of bile acids and salts / xenobiotic metabolic process / basal plasma membrane / basolateral plasma membrane / membrane / plasma membrane
Similarity search - Function
Organic anion transporter polypeptide / Organic Anion Transporter Polypeptide (OATP) family / Kazal-type serine protease inhibitor domain / Kazal domain superfamily / Kazal domain / Kazal domain profile. / Major facilitator superfamily domain / Major facilitator superfamily (MFS) profile. / MFS transporter superfamily
Similarity search - Domain/homology
Chem-BLR / Solute carrier organic anion transporter family member 1B1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.73 Å
AuthorsShan, Z. / Yang, X. / Liu, H. / Nan, J. / Yuan, Y. / Zhang, Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Cell Res / Year: 2023
Title: Cryo-EM structures of human organic anion transporting polypeptide OATP1B1.
Authors: Ziyang Shan / Xuemei Yang / Huihui Liu / Yafei Yuan / Yuan Xiao / Jing Nan / Wei Zhang / Wenqi Song / Jufang Wang / Feiwen Wei / Yanqing Zhang /
Abstract: Members of the solute carrier organic anion transporting polypeptide (OATPs) family function as transporters for a large variety of amphipathic organic anions including endogenous metabolites and ...Members of the solute carrier organic anion transporting polypeptide (OATPs) family function as transporters for a large variety of amphipathic organic anions including endogenous metabolites and clinical drugs, such as bile salts, steroids, thyroid hormones, statins, antibiotics, antivirals, and anticancer drugs. OATP1B1 plays a vital role in transporting such substances into the liver for hepatic clearance. FDA and EMA recommend conducting in vitro testing of drug-drug interactions (DDIs) involving OATP1B1. However, the structure and working mechanism of OATPs still remains elusive. In this study, we determined cryo-EM structures of human OATP1B1 bound with representative endogenous metabolites (bilirubin and estrone-3-sulfate), a clinical drug (simeprevir), and a fluorescent indicator (2',7'-dichlorofluorescein), in both outward- and inward-open states. These structures reveal major and minor substrate binding pockets and conformational changes during transport. In combination with mutagenesis studies and molecular dynamics simulations, our work comprehensively elucidates the transport mechanism of OATP1B1 and provides the structural basis for DDI predictions involving OATP1B1, which will greatly promote our understanding of OATPs.
History
DepositionDec 7, 2022Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Sep 13, 2023Provider: repository / Type: Initial release
Revision 1.1Dec 20, 2023Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Solute carrier organic anion transporter family member 1B1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)80,0214
Polymers78,7911
Non-polymers1,2303
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Solute carrier organic anion transporter family member 1B1 / SLCO1B1 / Liver-specific organic anion transporter 1 / LST-1 / OATP-C / Organic anion transporter ...SLCO1B1 / Liver-specific organic anion transporter 1 / LST-1 / OATP-C / Organic anion transporter SLC21A6 / Sodium-independent organic anion-transporting polypeptide 2 / OATP-2 / Solute carrier family 21 member 6


Mass: 78790.750 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: NAG / Source: (gene. exp.) Homo sapiens (human) / Gene: SLCO1B1, LST1, OATP1B1, OATP2, OATPC, SLC21A6 / Production host: Homo sapiens (human) / References: UniProt: Q9Y6L6
#2: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
#3: Chemical ChemComp-BLR / 3-[5-[(Z)-(4-ethenyl-3-methyl-5-oxidanylidene-pyrrol-2-ylidene)methyl]-2-[[5-[(Z)-(3-ethenyl-4-methyl-5-oxidanylidene-pyrrol-2-ylidene)methyl]-3-(3-hydroxy-3-oxopropyl)-4-methyl-1H-pyrrol-2-yl]methyl]-4-methyl-1H-pyrrol-3-yl]propanoic acid / Bilirubin IX alpha


Mass: 584.662 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Formula: C33H36N4O6 / Feature type: SUBJECT OF INVESTIGATION
#4: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: OATP1B1 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293
Buffer solutionpH: 8
SpecimenConc.: 9 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 281 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2300 nm / Nominal defocus min: 1500 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K3 (6k x 4k)
EM imaging opticsEnergyfilter name: GIF Quantum ER / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameCategory
2SerialEMimage acquisition
13cryoSPARC3D reconstruction
CTF correctionType: NONE
3D reconstructionResolution: 3.73 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 77213 / Symmetry type: POINT

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