Preferential 5-Methylcytosine Oxidation in the Linker Region of Reconstituted Positioned Nucleosomes by Tet1 Protein

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  • Kizaki, Seiichiro
    Department of Chemistry, Kyoto University
  • Zou, Tingting
    Department of Chemistry, Kyoto University
  • Li, Yue
    Department of Chemistry, Kyoto University
  • Han, Yong Woon
    Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University
  • Suzuki, Yuki
    Department of Robotics, Graduate School of Engineering, Tohoku University
  • Harada, Yoshie
    Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University
  • Sugiyama, Hiroshi
    Department of Chemistry, Kyoto University・Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University

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  • Preferential 5‐Methylcytosine Oxidation in the Linker Region of Reconstituted Positioned Nucleosomes by Tet1 Protein

Abstract

Tet (ten-eleven translocation) family proteins oxidize 5-methylcytosine (mC) to 5-hydroxymethylcytosine (hmC), 5-formylcytosine (fC), and 5-carboxycytosine (caC), and are suggested to be involved in the active DNA demethylation pathway. In this study, we reconstituted positioned mononucleosomes using CpG-methylated 382bp DNA containing the Widom 601 sequence and recombinant histone octamer, and subjected the nucleosome to treatment with Tet1 protein. The sites of oxidized methylcytosine were identified by bisulfite sequencing. We found that, for the oxidation reaction, Tet1 protein prefers mCs located in the linker region of the nucleosome compared with those located in the core region.

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