Cryo-EM structure of dehydroepiandrosterone sulfate-bound human ABC transporter ABCC3 in nanodiscs

Experimental Data Snapshot

  • Resolution: 3.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.4 of the entry. See complete history


Placing steroid hormones within the human ABCC3 transporter reveals a compatible amphiphilic substrate-binding pocket.

Wang, J.Li, X.Wang, F.F.Cheng, M.T.Mao, Y.X.Fang, S.C.Wang, L.Zhou, C.Z.Hou, W.T.Chen, Y.

(2023) EMBO J 42: e113415-e113415

  • DOI: https://doi.org/10.15252/embj.2022113415
  • Primary Citation of Related Structures:  
    8HVH, 8HW2, 8HW4

  • PubMed Abstract: 

    The human ABC transporter ABCC3 (also known as MRP3) transports a wide spectrum of substrates, including endogenous metabolites and exogenous drugs. Accordingly, it participates in multiple physiological processes and is involved in diverse human diseases such as intrahepatic cholestasis of pregnancy, which is caused by the intracellular accumulation of bile acids and estrogens. Here, we report three cryogenic electron microscopy structures of ABCC3: in the apo-form and in complexed forms bound to either the conjugated sex hormones β-estradiol 17-(β-D-glucuronide) and dehydroepiandrosterone sulfate. For both hormones, the steroid nuclei that superimpose against each other occupy the hydrophobic center of the transport cavity, whereas the two conjugation groups are separated and fixed by the hydrophilic patches in two transmembrane domains. Structural analysis combined with site-directed mutagenesis and ATPase activity assays revealed that ABCC3 possesses an amphiphilic substrate-binding pocket able to hold either conjugated hormone in an asymmetric pattern. These data build on consensus features of the substrate-binding pocket of MRPs and provide a structural platform for the rational design of inhibitors.

  • Organizational Affiliation

    Department of Endocrinology, Institute of Endocrine and Metabolic Diseases, The First Affiliated Hospital of USTC, and Center for Advanced Interdisciplinary Science and Biomedicine of IHM, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-binding cassette sub-family C member 31,527Homo sapiensMutation(s): 0 
EC: 7.6.2 (PDB Primary Data), (PDB Primary Data), (PDB Primary Data)
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O15438 (Homo sapiens)
Explore O15438 
Go to UniProtKB:  O15438
GTEx:  ENSG00000108846 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15438
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 3.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Chinese Academy of SciencesChina--

Revision History  (Full details and data files)

  • Version 1.0: 2023-06-07
    Type: Initial release
  • Version 1.1: 2023-08-02
    Changes: Database references
  • Version 1.2: 2023-08-30
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2023-09-20
    Changes: Database references
  • Version 1.4: 2023-10-11
    Changes: Database references