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- PDB-7o9w: Encequidar-bound human P-glycoprotein in complex with UIC2-Fab -

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Basic information

Entry
Database: PDB / ID: 7o9w
TitleEncequidar-bound human P-glycoprotein in complex with UIC2-Fab
Components
  • Multidrug resistance protein 1
  • UIC2 Fab-fragment heavy chain
  • UIC2 Fab-fragment light chain
KeywordsTRANSPORT PROTEIN / ABCB1 / MDR1 / P-glycoprotein / nanodisc / encequidar
Function / homology
Function and homology information


hormone transport / phosphatidylethanolamine floppase activity / cellular response to nonylphenol / cellular response to borneol / response to codeine / cellular response to mycotoxin / daunorubicin transport / positive regulation of response to drug / terpenoid transport / ceramide floppase activity ...hormone transport / phosphatidylethanolamine floppase activity / cellular response to nonylphenol / cellular response to borneol / response to codeine / cellular response to mycotoxin / daunorubicin transport / positive regulation of response to drug / terpenoid transport / ceramide floppase activity / regulation of intestinal absorption / cellular response to external biotic stimulus / response to cyclosporin A / response to antineoplastic agent / positive regulation of establishment of Sertoli cell barrier / negative regulation of sensory perception of pain / carboxylic acid transmembrane transport / floppase activity / ceramide translocation / Abacavir transmembrane transport / response to quercetin / carboxylic acid transmembrane transporter activity / establishment of blood-retinal barrier / protein localization to bicellular tight junction / phosphatidylethanolamine flippase activity / phosphatidylcholine floppase activity / external side of apical plasma membrane / Atorvastatin ADME / response to thyroxine / xenobiotic transport across blood-brain barrier / establishment of blood-brain barrier / export across plasma membrane / P-type phospholipid transporter / xenobiotic detoxification by transmembrane export across the plasma membrane / transepithelial transport / cellular response to L-glutamate / ABC-type xenobiotic transporter / response to vitamin A / response to vitamin D / response to glucagon / intestinal absorption / response to glycoside / response to alcohol / Prednisone ADME / phospholipid translocation / ABC-type xenobiotic transporter activity / cellular hyperosmotic salinity response / cellular response to alkaloid / maintenance of blood-brain barrier / cellular response to antibiotic / ATPase-coupled transmembrane transporter activity / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / cellular response to dexamethasone stimulus / response to cadmium ion / transmembrane transporter activity / transport across blood-brain barrier / lactation / response to progesterone / xenobiotic metabolic process / regulation of chloride transport / placenta development / stem cell proliferation / cellular response to estradiol stimulus / brush border membrane / female pregnancy / circadian rhythm / ABC-family protein mediated transport / transmembrane transport / G2/M transition of mitotic cell cycle / cellular response to tumor necrosis factor / cellular response to lipopolysaccharide / response to hypoxia / apical plasma membrane / response to xenobiotic stimulus / ubiquitin protein ligase binding / cell surface / ATP hydrolysis activity / extracellular exosome / ATP binding / membrane / plasma membrane / cytoplasm
Similarity search - Function
Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. ...Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Immunoglobulins / Immunoglobulin-like / Sandwich / P-loop containing nucleoside triphosphate hydrolase / Mainly Beta
Similarity search - Domain/homology
Chem-V5Q / ATP-dependent translocase ABCB1
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsNosol, K. / Locher, K.P.
Funding support Switzerland, 1items
OrganizationGrant numberCountry
Swiss National Science Foundation310030_189111 Switzerland
CitationJournal: J Med Chem / Year: 2022
Title: Discovery and Characterization of Potent Dual P-Glycoprotein and CYP3A4 Inhibitors: Design, Synthesis, Cryo-EM Analysis, and Biological Evaluations.
Authors: Sameer Urgaonkar / Kamil Nosol / Ahmed M Said / Nader N Nasief / Yahao Bu / Kaspar P Locher / Johnson Y N Lau / Michael P Smolinski /
Abstract: Targeted concurrent inhibition of intestinal drug efflux transporter P-glycoprotein (P-gp) and drug metabolizing enzyme cytochrome P450 3A4 (CYP3A4) is a promising approach to improve oral ...Targeted concurrent inhibition of intestinal drug efflux transporter P-glycoprotein (P-gp) and drug metabolizing enzyme cytochrome P450 3A4 (CYP3A4) is a promising approach to improve oral bioavailability of their common substrates such as docetaxel, while avoiding side effects arising from their pan inhibitions. Herein, we report the discovery and characterization of potent small molecule inhibitors of P-gp and CYP3A4 with encequidar (minimally absorbed P-gp inhibitor) as a starting point for optimization. To aid in the design of these dual inhibitors, we solved the high-resolution cryo-EM structure of encequidar bound to human P-gp. The structure guided us to prudently decorate the encequidar scaffold with CYP3A4 pharmacophores, leading to the identification of several analogues with dual potency against P-gp and CYP3A4. , dual P-gp and CYP3A4 inhibitor improved the oral absorption of docetaxel by 3-fold as compared to vehicle, while itself remained poorly absorbed.
History
DepositionApr 17, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 12, 2022Provider: repository / Type: Initial release
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Revision 1.1Jan 19, 2022Group: Database references / Category: citation / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Jan 26, 2022Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.year
Revision 1.3Nov 13, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.4Jul 2, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 2, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

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Assembly

Deposited unit
A: Multidrug resistance protein 1
B: UIC2 Fab-fragment light chain
C: UIC2 Fab-fragment heavy chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)191,7135
Polymers190,3313
Non-polymers1,3812
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area5650 Å2
ΔGint-38 kcal/mol
Surface area72400 Å2

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Components

#1: Protein Multidrug resistance protein 1 / ATP-binding cassette sub-family B member 1 / P-glycoprotein 1


Mass: 141628.781 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ABCB1, MDR1, PGY1 / Production host: Homo sapiens (human)
References: UniProt: P08183, ABC-type xenobiotic transporter, P-type phospholipid transporter
#2: Antibody UIC2 Fab-fragment light chain


Mass: 24321.039 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)
#3: Antibody UIC2 Fab-fragment heavy chain


Mass: 24381.281 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)
#4: Chemical ChemComp-V5Q / ~{N}-[2-[2-[4-[2-(6,7-dimethoxy-3,4-dihydro-1~{H}-isoquinolin-2-yl)ethyl]phenyl]-1,2,3,4-tetrazol-5-yl]-4,5-dimethoxy-phenyl]-4-oxidanylidene-2,3-dihydrochromene-2-carboxamide


Mass: 690.744 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C38H38N6O7 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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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

Component
IDNameTypeEntity IDParent-IDSource
1Nanodisc reconstituted human P-glycoprotein in complex with UIC2-Fab and encequidarCOMPLEX#1-#30RECOMBINANT
2Multidrug resistance protein 1COMPLEX#11RECOMBINANT
3FabCOMPLEX#2-#31RECOMBINANT
Molecular weightValue: 0.24 MDa / Experimental value: YES
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Homo sapiens (human)9606
23Mus musculus (house mouse)10090
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
12Homo sapiens (human)9606
23Homo sapiens (human)9606
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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 / Cs: 2.7 mm / C2 aperture diameter: 100 µm
Image recordingElectron dose: 58 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 79634 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00412893
ELECTRON MICROSCOPYf_angle_d0.77817466
ELECTRON MICROSCOPYf_dihedral_angle_d23.3644650
ELECTRON MICROSCOPYf_chiral_restr0.0471980
ELECTRON MICROSCOPYf_plane_restr0.0052203

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