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CGmCGCG is a versatile substrate with which to evaluate Tet protein activity
Seiichiro Kizaki1, Hiroshi Sugiyama
1Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, 606-8502, Japan. hs@kuchem.kyoto-u.ac.jp.
Organic & Biomolecular Chemistry
|October 29, 2013
Summary
Tet proteins iteratively oxidize DNA bases, converting 5-methylcytosine (mC) to 5-hydroxymethylcytosine and beyond. Tet proteins show a preference for single-stranded DNA substrates during this oxidation process.
Area of Science:
- Biochemistry
- Molecular Biology
- Epigenetics
Background:
- Tet family proteins are key enzymes in DNA demethylation.
- They catalyze the oxidation of 5-methylcytosine (mC) through several intermediates.
Purpose of the Study:
- To investigate the substrate specificity of Tet proteins.
- To explore the iterative oxidation of mC by Tet proteins.
Main Methods:
- High-performance liquid chromatography (HPLC) analysis was used to observe the oxidation products.
- Experiments were conducted using CGmCGCG as a potential substrate.
Main Results:
- Tet proteins were shown to iteratively oxidize mC.
- CGmCGCG was identified as a substrate for Tet protein-mediated oxidation.
- Tet proteins demonstrated a preference for single-stranded DNA over double-stranded DNA.
Conclusions:
- Tet proteins engage in iterative oxidation of DNA bases.
- Substrate structure, specifically single-strandedness, influences Tet protein activity.
