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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles
Published on: December 31, 2019
Structural basis of drug recognition by human MATE1 transporter
Ksenija Romane1, Giulia Peteani2,3, Somnath Mukherjee4
1Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland.
Human MATE1 (multidrug and toxin extrusion protein 1) is crucial for excreting cationic drugs like metformin. Structural studies reveal a shared binding site, explaining substrate specificity and drug interactions.
Area of Science:
- Biochemistry
- Structural Biology
- Pharmacology
Background:
- Human MATE1 (multidrug and toxin extrusion protein 1) is highly expressed in the kidney and liver.
- It plays a key role in the excretion of cationic drugs, impacting drug clearance and efficacy.
- Understanding MATE1's drug recognition is vital for optimizing therapies and predicting drug-drug interactions.
Purpose of the Study:
- To elucidate the molecular basis of drug recognition by the human MATE1 transporter.
- To determine the structural mechanisms underlying MATE1's substrate specificity.
Main Methods:
- Cryo-electron microscopy (cryo-EM) was used to determine the structures of hMATE1 in complex with substrates (MPP, metformin) and an inhibitor (cimetidine).
- Radioactivity-based cellular uptake assays with hMATE1 mutants were performed for functional validation.
- Molecular dynamics (MD) simulations were employed to analyze ligand binding modes and transporter dynamics.
Main Results:
- Cryo-EM structures revealed a shared binding site within a negatively charged pocket in the C-lobe of hMATE1.
- Key interactions between hMATE1 and its substrates/inhibitors were functionally validated through mutagenesis and uptake assays.
- MD simulations provided insights into the dynamic behavior of ligands within the binding pocket.
Conclusions:
- The study defines the structural basis for hMATE1's substrate specificity.
- These findings illuminate hMATE1's role in drug transport and the mechanisms underlying drug-drug interactions.
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