期刊
BIOMOLECULES
卷 13, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/biom13040613
关键词
anticancer drugs; cancer; human glutathione transferase P1-1 (hGSTP1-1); glutathione transferase; enzyme inhibition; multidrug resistance; pesticide
Multidrug resistance poses a significant barrier to effective anticancer therapies. This study identified iprodione as a potential lead compound with high inhibitory potency against the isoenzyme GSTP1-1 from Mus musculus. The findings shed light on the inhibition mechanism of MmGSTP1-1 and provide a new compound for future drug development.
Multidrug resistance is a significant barrier that makes anticancer therapies less effective. Glutathione transferases (GSTs) are involved in multidrug resistance mechanisms and play a significant part in the metabolism of alkylating anticancer drugs. The purpose of this study was to screen and select a lead compound with high inhibitory potency against the isoenzyme GSTP1-1 from Mus musculus (MmGSTP1-1). The lead compound was selected following the screening of a library of currently approved and registered pesticides that belong to different chemical classes. The results showed that the fungicide iprodione [3-(3,5-dichlorophenyl)-2,4-dioxo-N-propan-2-ylimidazolidine-1-carboxamide] exhibited the highest inhibition potency (Iota C-50 = 11.3 +/- 0.5 mu M) towards MmGSTP1-1. Kinetics analysis revealed that iprodione functions as a mixed-type inhibitor towards glutathione (GSH) and non-competitive inhibitor towards 1-chloro-2,4-dinitrobenzene (CDNB). X-ray crystallography was used to determine the crystal structure of MmGSTP1-1 at 1.28 angstrom resolution as a complex with S-(p-nitrobenzyl)glutathione (Nb-GSH). The crystal structure was used to map the ligand-binding site of MmGSTP1-1 and to provide structural data of the interaction of the enzyme with iprodione using molecular docking. The results of this study shed light on the inhibition mechanism of MmGSTP1-1 and provide a new compound as a potential lead structure for future drug/inhibitor development.
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