Related Experiment Video

Updated: Jul 29, 2025

Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration
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Published on: May 19, 2016

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Structural basis for substrate and inhibitor recognition of human multidrug transporter MRP4

Ying Huang1, Chenyang Xue1, Liangdong Wang2

  • 1Department Of Immunology And Microbiology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China.

Communications Biology
|May 22, 2023
PubMed

Insights

Structural insights into human multidrug resistance protein 4 (hMRP4) reveal its transport mechanism. Cryo-EM structures elucidate substrate and inhibitor binding, paving the way for targeted drug development.

Area of Science:

  • Structural Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Human multidrug resistance protein 4 (hMRP4/ABCC4) is crucial for multidrug resistance by translocating various substrates.
  • Understanding hMRP4's transport mechanism is vital but hindered by a lack of high-resolution structural data.

Purpose of the Study:

  • To elucidate the structural basis of hMRP4's transport mechanism and inhibition.
  • To provide high-resolution structures of hMRP4 in different functional states.

Main Methods:

  • Cryogenic electron microscopy (cryo-EM) to determine near-atomic structures.
  • Molecular dynamics simulations and biochemical assays to analyze transport and inhibition.

Main Results:

  • Near-atomic structures of hMRP4 in apo inward-open and ATP-bound outward-open states were resolved.
  • Structures captured substrate (PGE1) and inhibitor (sulindac) binding, revealing competitive binding in a shared hydrophobic pocket.
  • Distinct binding modes for substrates and inhibitors were identified.

Conclusions:

  • The study provides a structural understanding of hMRP4-mediated substrate transport and inhibition.
  • Findings offer insights into the mechanism of multidrug resistance and potential for developing hMRP4-targeted drugs.

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