6VXF

Structure of apo-closed ABCG2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

ABCG2 transports anticancer drugs via a closed-to-open switch.

Orlando, B.J.Liao, M.

(2020) Nat Commun 11: 2264-2264

  • DOI: 10.1038/s41467-020-16155-2
  • Primary Citation of Related Structures:  
    6VXI, 6VXH, 6VXJ, 6VXF

  • PubMed Abstract: 
  • ABCG2 is an ABC transporter that extrudes a variety of compounds from cells, and presents an obstacle in treating chemotherapy-resistant cancers. Despite recent structural insights, no anticancer drug bound to ABCG2 has been resolved, and the mechanisms of multidrug transport remain obscure ...

    ABCG2 is an ABC transporter that extrudes a variety of compounds from cells, and presents an obstacle in treating chemotherapy-resistant cancers. Despite recent structural insights, no anticancer drug bound to ABCG2 has been resolved, and the mechanisms of multidrug transport remain obscure. Such a gap of knowledge limits the development of novel compounds that block or evade this critical molecular pump. Here we present single-particle cryo-EM studies of ABCG2 in the apo state, and bound to the three structurally distinct chemotherapeutics. Without the binding of conformation-selective antibody fragments or inhibitors, the resting ABCG2 adopts a closed conformation. Our cryo-EM, biochemical, and functional analyses reveal the binding mode of three chemotherapeutic compounds, demonstrate how these molecules open the closed conformation of the transporter, and establish that imatinib is particularly effective in stabilizing the inward facing conformation of ABCG2. Together these studies reveal the previously unrecognized conformational cycle of ABCG2.


    Organizational Affiliation

    Department of Cell Biology, Harvard Medical School, Boston, MA, 02115, USA. maofu_liao@hms.harvard.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Broad substrate specificity ATP-binding cassette transporter ABCG2AB655Homo sapiensMutation(s): 0 
Gene Names: ABCG2ABCPBCRPBCRP1MXR
EC: 7.6.2.2
Find proteins for Q9UNQ0 (Homo sapiens)
Explore Q9UNQ0 
Go to UniProtKB:  Q9UNQ0
NIH Common Fund Data Resources
PHAROS  Q9UNQ0
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
American Cancer SocietyUnited StatesPF1721201DMC

Revision History 

  • Version 1.0: 2020-05-13
    Type: Initial release
  • Version 1.1: 2020-05-20
    Changes: Database references