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• W2057962001 abstract "Histone acetyltransferases (HATs) are an important class of epigenetic enzymes involved in chromatin restructuring and transcriptional regulation. We describe in this paper a novel approach for the identification and characterization of HAT inhibitors using both fluorescence resonance energy transfer (FRET) and fluorescence polarization. Expressed protein ligation (EPL) was used to label HATs PCAF and p300 with Dabcyl (Dab) as FRET acceptors. Methoxycoumarin (Mca) is conjugated to HAT substrate analogues to function as fluorescent donors, namely, H3CoA20Mca for interacting with PCAF and LysCoAMca for p300. When a ligand-protein interaction occurs, the fluorescent intensity of the donor fluorophore decreases due to FRET quenching by the Dab acceptor. Meanwhile, the formation of ligand-protein complexes causes reduction of the molecular mobility of the donor fluorophore, resulting in increased fluorescence anisotropy. Thus, dual modes of fluorescence measurement, FRET and anisotropy, are integrated in the same assay system. In particular, we demonstrated that both FRET and anisotropy measurements can be used to effectively detect and characterize HAT inhibitors. The developed strategy should be useful in the search of new anticancer drugs that target the substrate interfaces of the HAT targets, as well as find values in mechanistic study of HATs." @default.
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• W2057962001 date "2009-01-15" @default.
• W2057962001 modified "2023-10-01" @default.
• W2057962001 title "A Dual-Mode Fluorescence Strategy for Screening HAT Modulators" @default.
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• W2057962001 doi "https://doi.org/10.1021/bc800467a" @default.
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