Maintenance DNA Methyltransferase Activity in the Presence of Oxidized Forms of 5-Methylcytosine: Structural Basis for Ten Eleven Translocation-Mediated DNA Demethylation.
Maintenance DNA Methyltransferase Activity in the Presence of Oxidized Forms of 5-Methylcytosine: Structural Basis for Ten Eleven Translocation-Mediated DNA Demethylation.
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5-甲基胞嘧啶氧化形式存在下维持 DNA 甲基转移酶活性:111 易位介导的 DNA 去甲基化的结构基础。
DOI:
10.1021/acs.biochem.8b00683
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发表时间:
2018
期刊:
影响因子:
2.9
通讯作者:
Tretyakova,NataliaY
中科院分区:
文献类型:
--
作者:
Seiler,ChristopherL;Fernandez,Jenna;Koerperich,Zoe;Andersen,MollyP;Kotandeniya,Delshanee;Nguyen,MeginE;Sham,YukY;Tretyakova,NataliaY
A precise balance of DNA methylation and demethylation is required for epigenetic control of cell identity, development, and growth. DNA methylation marks are introduced byde novoDNA methyltransferases DNMT3a/b and are maintained throughout cell divisions by DNA methyltransferase 1 (DNMT1), which adds methyl groups to hemimethylated CpG dinucleotides generated during DNA replication. Ten eleven translocation (TET) dioxygenases oxidize 5-methylcytosine (mC) to 5-hydroxymethylcytosine (hmC), 5-formylcytosine (fC), and 5-carboxylcytosine (caC), a process known to induce DNA demethylation and gene reactivation. In this study, we investigated the catalytic activity of human DNMT1 in the presence of oxidized forms of mC. A mass spectrometry-based assay was employed to study the kinetics of DNMT1-mediated cytosine methylation in CG dinucleotides containing C, mC, hmC, fC, or caC across from the target cytosine. Homology modeling, coupled with molecular dynamics simulations, was used to explore the structural consequences of mC oxidation with regard to the geometry of protein–DNA complexes. The DNMT1 enzymatic activity was strongly affected by the oxidation status of mC, with the catalytic efficiency decreasing in the following order: mC > hmC > fC > caC. Molecular dynamics simulations revealed that DNMT1 forms an unproductive complex with DNA duplexes containing oxidized forms of mC as a consequence of altered interactions of the target recognition domain of the protein with the C-5 substituent on cytosine. Our results provide new structural and mechanistic insight into TET-mediated DNA demethylation.
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影响因子:
--
作者:
Ji D;Lin K;Song J;Wang Y
通讯作者:
Wang Y
影响因子:
11.2
作者:
Valinluck, Victoria;Sowers, Lawrence C.
通讯作者:
Sowers, Lawrence C.
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
S. Pradhan;A. Bacolla;R. Wells;R. Roberts
通讯作者:
R. Roberts
影响因子:
2.9
作者:
Douglas M. Matje;C. Krivacic;F. Dahlquist;N. Reich
通讯作者:
Douglas M. Matje;C. Krivacic;F. Dahlquist;N. Reich
DOI:
10.1126/science.1237905
发表时间:
2013-08-09
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Lister R;Mukamel EA;Nery JR;Urich M;Puddifoot CA;Johnson ND;Lucero J;Huang Y;Dwork AJ;Schultz MD;Yu M;Tonti-Filippini J;Heyn H;Hu S;Wu JC;Rao A;Esteller M;He C;Haghighi FG;Sejnowski TJ;Behrens MM;Ecker JR
通讯作者:
Ecker JR