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Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
Published on: August 5, 2022
Curcumin is a potent DNA hypomethylation agent.
Zhongfa Liu1, Zhiliang Xie, William Jones
1Division of Pharmaceutics, College of Pharmacy, The Ohio State University, 500 W. 12th St., Columbus, OH 43210, USA. liu.550@osu.edu
Bioorganic & Medicinal Chemistry Letters
|December 30, 2008
Summary
Curcumin inhibits DNA methyltransferase 1 (DNMT1) by covalently blocking its active site. This natural compound also induces global DNA hypomethylation in leukemia cells.
Area of Science:
- Biochemistry
- Molecular Biology
- Epigenetics
Background:
- DNA methyltransferase 1 (DNMT1) is a key enzyme in DNA methylation.
- Aberrant DNA methylation is implicated in various diseases, including cancer.
- Curcumin, a natural compound, has shown potential therapeutic properties.
Purpose of the Study:
- To investigate the molecular mechanism of curcumin's interaction with DNMT1.
- To evaluate the inhibitory activity of curcumin against DNMT1.
- To assess the effect of curcumin on DNA methylation in a cellular context.
Main Methods:
- Molecular docking simulations to predict binding mode.
- Enzymatic assays using M. SssI to measure DNMT1 activity.
- Cell-based assays to analyze global DNA methylation levels.
Main Results:
- Molecular docking revealed curcumin covalently blocks the catalytic thiolate of C1226 in DNMT1.
- Curcumin demonstrated potent inhibition of M. SssI activity with an IC(50) of 30 nM.
- Hexahydrocurcumin showed no inhibitory activity up to 100 microM.
- Curcumin treatment led to global DNA hypomethylation in a leukemia cell line.
Conclusions:
- Curcumin acts as a covalent inhibitor of DNMT1.
- The specific covalent interaction at C1226 is crucial for DNMT1 inhibition by curcumin.
- Curcumin's ability to induce DNA hypomethylation suggests potential epigenetic therapeutic applications.
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