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- EMDB-40226: CryoEM structure of P-Glycoprotein in Apo state -

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Basic information

Entry
Database: EMDB / ID: EMD-40226
TitleCryoEM structure of P-Glycoprotein in Apo state
Map dataPgp in lipid nanodiscs in Apo form
Sample
  • Complex: CryoEM structure of P-Glycoprotein in Apo state
    • Protein or peptide: ATP-dependent translocase ABCB1
Keywordsmultidrug resistance / ABC transporter / membrane protein / transporter / TRANSPORT PROTEIN
Function / homology
Function and homology information


terpenoid transport / ceramide floppase activity / phosphatidylethanolamine floppase activity / carboxylic acid transmembrane transport / regulation of chloride transport / floppase activity / ceramide translocation / Abacavir transmembrane transport / carboxylic acid transmembrane transporter activity / phosphatidylethanolamine flippase activity ...terpenoid transport / ceramide floppase activity / phosphatidylethanolamine floppase activity / carboxylic acid transmembrane transport / regulation of chloride transport / floppase activity / ceramide translocation / Abacavir transmembrane transport / carboxylic acid transmembrane transporter activity / phosphatidylethanolamine flippase activity / phosphatidylcholine floppase activity / xenobiotic transport across blood-brain barrier / stem cell proliferation / external side of apical plasma membrane / Atorvastatin ADME / export across plasma membrane / P-type phospholipid transporter / transepithelial transport / xenobiotic detoxification by transmembrane export across the plasma membrane / ABC-type xenobiotic transporter / phospholipid translocation / Prednisone ADME / ABC-type xenobiotic transporter activity / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / ATPase-coupled transmembrane transporter activity / transport across blood-brain barrier / transmembrane transporter activity / xenobiotic metabolic process / G2/M transition of mitotic cell cycle / ABC-family protein mediated transport / transmembrane transport / 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 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ATP-dependent translocase ABCB1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsCulbertson A / Liao M
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
CitationJournal: Nat Commun / Year: 2025
Title: Cryo-EM of human P-glycoprotein reveals an intermediate occluded conformation during active drug transport.
Authors: Alan T Culbertson / Maofu Liao /
Abstract: P-glycoprotein (Pgp) is an important human multidrug transporter that contributes to pharmacokinetics and multidrug resistance. Despite decades of study, the conformation transition cycle of Pgp ...P-glycoprotein (Pgp) is an important human multidrug transporter that contributes to pharmacokinetics and multidrug resistance. Despite decades of study, the conformation transition cycle of Pgp undergoing active drug transport is not defined, thus the precise relevance of all available Pgp structures to uninterrupted multidrug transport remains unclear. Here, we use cryo-EM of membrane-embedded human Pgp under continuous turnover conditions to analyze the conformational ensembles of Pgp transporting distinct substrates. These results delineate multiple conformations including inward-facing and closed conformations, highlighting the occluded conformation as a critical intermediate state between transporter closure and substrate release. A combination of structural, functional, and computational studies reveals the transmembrane helices 4 and 10 undergoing drastic rearrangement to coordinate substrate binding, occlusion, and release, and identifies a peripheral site involved in substrate capture and Pgp inhibition. Together, our results provide a set of snapshots of Pgp undergoing continuous drug transport, unveiling the intricate interplay between transporter dynamics and drug movement, and shed light on the mechanism of polyspecificity.
History
DepositionMar 25, 2023-
Header (metadata) releaseApr 23, 2025-
Map releaseApr 23, 2025-
UpdateMay 21, 2025-
Current statusMay 21, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_40226.png

Downloads & links

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Map

FileDownload / File: emd_40226.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPgp in lipid nanodiscs in Apo form
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 192 pix.
= 203.52 Å		1.06 Å/pix.
x 192 pix.
= 203.52 Å		1.06 Å/pix.
x 192 pix.
= 203.52 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.057
Minimum - Maximum-0.13577351 - 0.20130348
Average (Standard dev.)0.00028747675 (±0.011343199)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-96-96-96
Dimensions192192192
Spacing192192192
CellA=B=C: 203.51999 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Pgp in lipid nanodiscs in Apo form

Fileemd_40226_half_map_1.map
AnnotationPgp in lipid nanodiscs in Apo form
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Pgp in lipid nanodiscs in Apo form

Fileemd_40226_half_map_2.map
AnnotationPgp in lipid nanodiscs in Apo form
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : CryoEM structure of P-Glycoprotein in Apo state

EntireName: CryoEM structure of P-Glycoprotein in Apo state
Components
  • Complex: CryoEM structure of P-Glycoprotein in Apo state
    • Protein or peptide: ATP-dependent translocase ABCB1

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Supramolecule #1: CryoEM structure of P-Glycoprotein in Apo state

SupramoleculeName: CryoEM structure of P-Glycoprotein in Apo state / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: ATP-dependent translocase ABCB1

MacromoleculeName: ATP-dependent translocase ABCB1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: ABC-type xenobiotic transporter
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 141.644781 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MDLEGDRNGG AKKKNFFKLN NKSEKDKKEK KPTVSVFSMF RYSNWLDKLY MVVGTLAAII HGAGLPLMML VFGEMTDIFA NAGNLEDLM SNITNRSDIN DTGFFMNLEE DMTRYAYYYS GIGAGVLVAA YIQVSFWCLA AGRQIHKIRK QFFHAIMRQE I GWFDVHDV ...String:
MDLEGDRNGG AKKKNFFKLN NKSEKDKKEK KPTVSVFSMF RYSNWLDKLY MVVGTLAAII HGAGLPLMML VFGEMTDIFA NAGNLEDLM SNITNRSDIN DTGFFMNLEE DMTRYAYYYS GIGAGVLVAA YIQVSFWCLA AGRQIHKIRK QFFHAIMRQE I GWFDVHDV GELNTRLTDD VSKINEGIGD KIGMFFQSMA TFFTGFIVGF TRGWKLTLVI LAISPVLGLS AAVWAKILSS FT DKELLAY AKAGAVAEEV LAAIRTVIAF GGQKKELERY NKNLEEAKRI GIKKAITANI SIGAAFLLIY ASYALAFWYG TTL VLSGEY SIGQVLTVFF SVLIGAFSVG QASPSIEAFA NARGAAYEIF KIIDNKPSID SYSKSGHKPD NIKGNLEFRN VHFS YPSRK EVKILKGLNL KVQSGQTVAL VGNSGCGKST TVQLMQRLYD PTEGMVSVDG QDIRTINVRF LREIIGVVSQ EPVLF ATTI AENIRYGREN VTMDEIEKAV KEANAYDFIM KLPHKFDTLV GERGAQLSGG QKQRIAIARA LVRNPKILLL DEATSA LDT ESEAVVQVAL DKARKGRTTI VIAHRLSTVR NADVIAGFDD GVIVEKGNHD ELMKEKGIYF KLVTMQTAGN EVELENA AD ESKSEIDALE MSSNDSRSSL IRKRSTRRSV RGSQAQDRKL STKEALDESI PPVSFWRIMK LNLTEWPYFV VGVFCAII N GGLQPAFAII FSKIIGVFTR IDDPETKRQN SNLFSLLFLA LGIISFITFF LQGFTFGKAG EILTKRLRYM VFRSMLRQD VSWFDDPKNT TGALTTRLAN DAAQVKGAIG SRLAVITQNI ANLGTGIIIS FIYGWQLTLL LLAIVPIIAI AGVVEMKMLS GQALKDKKE LEGSGKIATE AIENFRTVVS LTQEQKFEHM YAQSLQVPYR NSLRKAHIFG ITFSFTQAMM YFSYAGCFRF G AYLVAHKL MSFEDVLLVF SAVVFGAMAV GQVSSFAPDY AKAKISAAHI IMIIEKTPLI DSYSTEGLMP NTLEGNVTFG EV VFNYPTR PDIPVLQGLS LEVKKGQTLA LVGSSGCGKS TVVQLLERFY DPLAGKVLLD GKEIKRLNVQ WLRAHLGIVS QEP ILFDCS IAENIAYGDN SRVVSQEEIV RAAKEANIHA FIESLPNKYS TKVGDKGTQL SGGQKQRIAI ARALVRQPHI LLLD EATSA LDTESEKVVQ EALDKAREGR TCIVIAHRLS TIQNADLIVV FQNGRVKEHG THQQLLAQKG IYFSMVSVQA GTKRQ

UniProtKB: ATP-dependent translocase ABCB1

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
Component:
ConcentrationNameFormula
50.0 mMTris-HCl
150.0 mMSodium ChlorideNaCl
0.1 mMTCEP
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 2 / Number real images: 8983 / Average exposure time: 3.5 sec. / Average electron dose: 51.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 81000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 25967
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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