- EMDB-63652: Cryo-EM structure of Arabidopsis thaliana MET1 -
+
データを開く
IDまたはキーワード:
読み込み中...
-
基本情報
登録情報
データベース: EMDB / ID: EMD-63652
タイトル
Cryo-EM structure of Arabidopsis thaliana MET1
マップデータ
試料
複合体: MET1
タンパク質・ペプチド: DNA (cytosine-5)-methyltransferase 1
リガンド: ZINC ION
キーワード
DNA methylation / STRUCTURAL PROTEIN
機能・相同性
機能・相同性情報
zygote asymmetric cytokinesis in embryo sac / epigenetic programming in the endosperm / negative regulation of flower development / DNA-mediated transformation / inflorescence development / DNA (cytosine-5-)-methyltransferase / DNA (cytosine-5-)-methyltransferase activity / DNA methylation-dependent constitutive heterochromatin formation / negative regulation of gene expression via chromosomal CpG island methylation / methyltransferase activity ...zygote asymmetric cytokinesis in embryo sac / epigenetic programming in the endosperm / negative regulation of flower development / DNA-mediated transformation / inflorescence development / DNA (cytosine-5-)-methyltransferase / DNA (cytosine-5-)-methyltransferase activity / DNA methylation-dependent constitutive heterochromatin formation / negative regulation of gene expression via chromosomal CpG island methylation / methyltransferase activity / methylation / chromatin binding / DNA binding / nucleus 類似検索 - 分子機能
DNA (cytosine-5)-methyltransferase 1, replication foci domain / Cytosine specific DNA methyltransferase replication foci domain / DNA methylase, C-5 cytosine-specific, conserved site / C-5 cytosine-specific DNA methylases C-terminal signature. / : / DNA methylase, C-5 cytosine-specific, active site / C-5 cytosine-specific DNA methylases active site. / C-5 cytosine-specific DNA methylase (Dnmt) domain profile. / C-5 cytosine methyltransferase / C-5 cytosine-specific DNA methylase ...DNA (cytosine-5)-methyltransferase 1, replication foci domain / Cytosine specific DNA methyltransferase replication foci domain / DNA methylase, C-5 cytosine-specific, conserved site / C-5 cytosine-specific DNA methylases C-terminal signature. / : / DNA methylase, C-5 cytosine-specific, active site / C-5 cytosine-specific DNA methylases active site. / C-5 cytosine-specific DNA methylase (Dnmt) domain profile. / C-5 cytosine methyltransferase / C-5 cytosine-specific DNA methylase / Bromo adjacent homology domain / BAH domain / Bromo adjacent homology (BAH) domain / Bromo adjacent homology (BAH) domain superfamily / BAH domain profile. / S-adenosyl-L-methionine-dependent methyltransferase superfamily 類似検索 - ドメイン・相同性
ジャーナル: Nat Commun / 年: 2025 タイトル: Cryo-EM reveals evolutionarily conserved and distinct structural features of plant CG maintenance methyltransferase MET1. 著者: Amika Kikuchi / Atsuya Nishiyama / Yoshie Chiba / Makoto Nakanishi / Taiko Kim To / Kyohei Arita / 要旨: DNA methylation is essential for genomic function and transposable element silencing. In plants, DNA methylation occurs in CG, CHG, and CHH contexts (where H = A, T, or C), with the maintenance ...DNA methylation is essential for genomic function and transposable element silencing. In plants, DNA methylation occurs in CG, CHG, and CHH contexts (where H = A, T, or C), with the maintenance of CG methylation mediated by the DNA methyltransferase MET1. The molecular mechanism by which MET1 maintains CG methylation, however, remains unclear. Here, we report cryogenic electron microscopy structures of Arabidopsis thaliana MET1. We find that the methyltransferase domain of MET1 specifically methylates hemimethylated DNA in vitro. The structure of MET1 bound to hemimethylated DNA reveals the activation mechanism of MET1 resembling that of mammalian DNMT1. Curiously, the structure of apo-MET1 shows an autoinhibitory state distinct from that of DNMT1, where the RFTS2 domain and the connecting linker inhibit DNA binding. The autoinhibition of MET1 is relieved upon binding of a potential activator, ubiquitinated histone H3. Taken together, our structural analysis demonstrates both conserved and distinct molecular mechanisms regulating CG maintenance methylation in plant and animal DNA methyltransferases.