- EMDB-48497: The cryo-EM structure of the human DNA methyltransferase DNMT3A2 ... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-48497
タイトル
The cryo-EM structure of the human DNA methyltransferase DNMT3A2 and DNMT3L octamer
マップデータ
Cryo-EM map of DNA methyltransferase DNMT3A2 hexamer
試料
複合体: human DNA methyltransferase DNMT3A2 hexamer
タンパク質・ペプチド: DNA (cytosine-5)-methyltransferase 3A
リガンド: ZINC ION
リガンド: S-ADENOSYL-L-HOMOCYSTEINE
キーワード
methyltransferase / octamer / TRANSFERASE / TRANSFERASE-DNA complex / DNA BINDING PROTEIN
機能・相同性
機能・相同性情報
transposable element silencing by piRNA-mediated DNA methylation / positive regulation of cellular response to hypoxia / protein-cysteine methyltransferase activity / regulatory ncRNA-mediated heterochromatin formation / cellular response to bisphenol A / unmethylated CpG binding / DNA (cytosine-5-)-methyltransferase / DNA (cytosine-5-)-methyltransferase activity / autosome genomic imprinting / SUMOylation of DNA methylation proteins ...transposable element silencing by piRNA-mediated DNA methylation / positive regulation of cellular response to hypoxia / protein-cysteine methyltransferase activity / regulatory ncRNA-mediated heterochromatin formation / cellular response to bisphenol A / unmethylated CpG binding / DNA (cytosine-5-)-methyltransferase / DNA (cytosine-5-)-methyltransferase activity / autosome genomic imprinting / SUMOylation of DNA methylation proteins / XY body / oocyte development / response to vitamin A / DNA methylation-dependent constitutive heterochromatin formation / response to ionizing radiation / hepatocyte apoptotic process / negative regulation of gene expression via chromosomal CpG island methylation / lncRNA binding / chromosome, centromeric region / cellular response to ethanol / catalytic complex / heterochromatin / 転移酵素; 一炭素原子の基を移すもの; メチル基を移すもの / DNA methylation / PRC2 methylates histones and DNA / post-embryonic development / Defective pyroptosis / response to cocaine / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / cellular response to amino acid stimulus / euchromatin / response to lead ion / response to toxic substance / RMTs methylate histone arginines / neuron differentiation / nuclear matrix / transcription corepressor activity / response to estradiol / methylation / spermatogenesis / cellular response to hypoxia / RNA polymerase II-specific DNA-binding transcription factor binding / RNA polymerase II cis-regulatory region sequence-specific DNA binding / response to xenobiotic stimulus / negative regulation of DNA-templated transcription / chromatin binding / negative regulation of transcription by RNA polymerase II / DNA binding / zinc ion binding / nucleoplasm / identical protein binding / nucleus / cytoplasm 類似検索 - 分子機能
National Institutes of Health/National Cancer Institute (NIH/NCI)
R35CA209859
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2026 タイトル: Mechanisms of DNMT3A-3L-mediated de novo DNA methylation on chromatin. 著者: Yan Yan / X Edward Zhou / Stacey L Thomas / Minmin Liu / Gan-Qiang Lai / Evan J Worden / Peter A Jones / Ting-Hai Xu / 要旨: De novo DNA methylation is mediated by DNA methyltransferases DNMT3A and DNMT3B, in cooperation with the catalytically inactive paralogs DNMT3L and DNMT3B3. DNMT3L is predominantly expressed in ...De novo DNA methylation is mediated by DNA methyltransferases DNMT3A and DNMT3B, in cooperation with the catalytically inactive paralogs DNMT3L and DNMT3B3. DNMT3L is predominantly expressed in embryonic stem cells to establish methylation patterns and is silenced upon differentiation, with DNMT3B3 substituting in somatic cells. Here we present high-resolution cryo-electron microscopy structures of nucleosome-bound, full-length DNMT3A2-3L and its oligomeric assemblies in the nucleosome-free state. We identified the critical role of DNMT3L as a histone modification sensor, guiding chromatin engagement through a mechanism distinct from DNMT3B3. The structures show a 180° rotated 'switching helix' in DNMT3L that prevents direct interaction with the nucleosome acidic patch. Instead, nucleosome binding is mediated by the DNMT3L ADD domain, while the DNMT3A PWWP domain exhibits reduced engagement in the absence of H3K36 methylation. The oligomeric arrangement of DNMT3A2-3L in nucleosome-free states highlights its dynamic assembly and potential allosteric regulation. We further capture dynamic structural movements of DNMT3A2-3L on nucleosomes. These findings uncover a previously unknown mechanism by which DNMT3A-3L mediates de novo DNA methylation on chromatin through complex assembly, histone tail sensing, dynamic DNA search and regulated nucleosome engagement, providing insights into epigenetic regulation.