Structure of an inhibitor-bound ABC transporter

Experimental Data Snapshot

  • Resolution: 3.56 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural basis of small-molecule inhibition of human multidrug transporter ABCG2.

Jackson, S.M.Manolaridis, I.Kowal, J.Zechner, M.Taylor, N.M.I.Bause, M.Bauer, S.Bartholomaeus, R.Bernhardt, G.Koenig, B.Buschauer, A.Stahlberg, H.Altmann, K.H.Locher, K.P.

(2018) Nat Struct Mol Biol 25: 333-340

  • DOI: https://doi.org/10.1038/s41594-018-0049-1
  • Primary Citation of Related Structures:  
    6ETI, 6FEQ, 6FFC, 6HIJ

  • PubMed Abstract: 

    ABCG2 is an ATP-binding cassette (ABC) transporter that protects tissues against xenobiotics, affects the pharmacokinetics of drugs and contributes to multidrug resistance. Although many inhibitors and modulators of ABCG2 have been developed, understanding their structure-activity relationship requires high-resolution structural insight. Here, we present cryo-EM structures of human ABCG2 bound to synthetic derivatives of the fumitremorgin C-related inhibitor Ko143 or the multidrug resistance modulator tariquidar. Both compounds are bound to the central, inward-facing cavity of ABCG2, blocking access for substrates and preventing conformational changes required for ATP hydrolysis. The high resolutions allowed for de novo building of the entire transporter and also revealed tightly bound phospholipids and cholesterol interacting with the lipid-exposed surface of the transmembrane domains (TMDs). Extensive chemical modifications of the Ko143 scaffold combined with in vitro functional analyses revealed the details of ABCG2 interactions with this compound family and provide a basis for the design of novel inhibitors and modulators.

  • Organizational Affiliation

    Center for Cellular Imaging and NanoAnalytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-binding cassette sub-family G member 2
A, B
664Homo sapiensMutation(s): 0 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UNQ0 (Homo sapiens)
Explore Q9UNQ0 
Go to UniProtKB:  Q9UNQ0
GTEx:  ENSG00000118777 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UNQ0
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on BWQ

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
~{tert}-butyl 3-[(2~{S},5~{S},8~{S})-14-cyclopentyloxy-2-(2-methylpropyl)-4,7-bis(oxidanylidene)-3,6,17-triazatetracyclo[^{3,8}.0^{11,16}]heptadeca-1(10),11,13,15-tetraen-5-yl]propanoate
C30 H41 N3 O5
Experimental Data & Validation

Experimental Data

  • Resolution: 3.56 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
SNSF NCCR TransCureSwitzerland--
ETH ZurichSwitzerlandETH-22-14-1

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-11
    Type: Initial release
  • Version 1.1: 2018-04-18
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-11
    Changes: Other