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Efficient Purification and LC-MS/MS-based Assay Development for Ten-Eleven Translocation-2 5-Methylcytosine Dioxygenase
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Purification of TET Proteins
Zhijun Huang1, Jiyoung Yu1,2, Jennifer Johnson1
1Center for Epigenetics, Van Andel Institute, Grand Rapids, MI, USA.
Methods in Molecular Biology (Clifton, N.J.)
|May 19, 2021
Summary
Researchers purified mammalian TET proteins to study their role in DNA demethylation. This work facilitates in vitro analysis of TET protein activity and substrate specificity in epigenetic regulation.
Area of Science:
- Epigenetics and Gene Regulation
- DNA Methylation and Demethylation Pathways
Background:
- The TET protein-mediated oxidation pathway is crucial for active DNA demethylation, converting 5-methylcytosine (5mC) to cytosine through intermediate oxidized forms.
- Understanding TET protein function requires robust in vitro systems to analyze their DNA substrate specificities and activity within chromatin.
Purpose of the Study:
- To describe reliable methods for purifying mammalian TET proteins for biochemical and functional studies.
- To enable detailed in vitro investigations of TET protein-mediated 5-methylcytosine oxidation and DNA demethylation.
Main Methods:
- Purification of mammalian TET proteins using expression systems in insect cells.
- Purification of mammalian TET proteins using expression systems in 293T cells.
- Summarization of a method to monitor 5-methylcytosine oxidase activity of purified TET proteins in vitro.
Main Results:
- Successful purification protocols for mammalian TET proteins were established.
- The described methods allow for the production of active TET proteins for biochemical assays.
Conclusions:
- The developed purification strategies provide essential tools for in-depth in vitro characterization of TET proteins.
- These methods will advance research into the epigenetic mechanisms of DNA demethylation and gene regulation.
