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Insights on the structure-function relationship of human multidrug resistance protein 7 (MRP7/ABCC10) from molecular
Jing-Quan Wang1, Qingbin Cui1,2, Zi-Ning Lei1
1Department of Pharmaceutical Sciences College of Pharmacy and Health Sciences St. John's University Queens New York USA.
Abstract:
ATP-binding cassette (ABC) transporters superfamily mediates multidrug resistance in cancer by extruding structurally distinct chemotherapeutic agents, causing failure in chemotherapy. Among the 49 ABC transporters, multidrug resistance protein 7 (MRP7 or ABCC10) is relatively new and has been identified as the efflux pump of multiple anticancer agents including Vinca alkaloids and taxanes. Herein, we construct and validate a homology model for human MRP7 based on the cryo-EM structures of MRP1. Structure-function relationship of MRP7 was obtained from molecular dynamics simulations and docking studies and was in accordance with previous studies of ABC transporters. The motion patterns correlated with efflux mechanism were discussed. Additionally, predicted substrate- and modulator-binding sites of MRP7 were described for the first time, which provided rational insights in understanding the drug binding and functional regulation in MRP7. Our findings will benefit the high-throughput virtual screening and development of MRP7 modulators in the future.
Insights
Researchers modeled multidrug resistance protein 7 (MRP7), an efflux pump contributing to cancer chemotherapy failure. This model aids in understanding drug interactions and developing new cancer treatments.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- ATP-binding cassette (ABC) transporters contribute to multidrug resistance in cancer.
- Multidrug resistance protein 7 (MRP7 or ABCC10) is an ABC transporter that effluxes key anticancer drugs like Vinca alkaloids and taxanes, leading to chemotherapy failure.
Purpose of the Study:
- To construct and validate a homology model of human MRP7.
- To elucidate the structure-function relationship and drug-binding mechanisms of MRP7.
Main Methods:
- Homology modeling based on cryo-EM structures of MRP1.
- Molecular dynamics simulations.
- Molecular docking studies.
Main Results:
- A validated homology model for human MRP7 was developed.
- Structure-function relationships and motion patterns related to the drug efflux mechanism were elucidated.
- Novel substrate- and modulator-binding sites of MRP7 were predicted.
Conclusions:
- The study provides the first predicted binding sites for MRP7, offering insights into drug binding and regulation.
- The findings support future high-throughput virtual screening for MRP7 modulators to overcome chemotherapy resistance.
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