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-Structure paper
タイトル | Structural basis for activation of DNMT1. |
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ジャーナル・号・ページ | Nat Commun, Vol. 13, Issue 1, Page 7130, Year 2022 |
掲載日 | 2022年11月21日 |
著者 | Amika Kikuchi / Hiroki Onoda / Kosuke Yamaguchi / Satomi Kori / Shun Matsuzawa / Yoshie Chiba / Shota Tanimoto / Sae Yoshimi / Hiroki Sato / Atsushi Yamagata / Mikako Shirouzu / Naruhiko Adachi / Jafar Sharif / Haruhiko Koseki / Atsuya Nishiyama / Makoto Nakanishi / Pierre-Antoine Defossez / Kyohei Arita / |
PubMed 要旨 | DNMT1 is an essential enzyme that maintains genomic DNA methylation, and its function is regulated by mechanisms that are not yet fully understood. Here, we report the cryo-EM structure of human ...DNMT1 is an essential enzyme that maintains genomic DNA methylation, and its function is regulated by mechanisms that are not yet fully understood. Here, we report the cryo-EM structure of human DNMT1 bound to its two natural activators: hemimethylated DNA and ubiquitinated histone H3. We find that a hitherto unstudied linker, between the RFTS and CXXC domains, plays a key role for activation. It contains a conserved α-helix which engages a crucial "Toggle" pocket, displacing a previously described inhibitory linker, and allowing the DNA Recognition Helix to spring into the active conformation. This is accompanied by large-scale reorganization of the inhibitory RFTS and CXXC domains, allowing the enzyme to gain full activity. Our results therefore provide a mechanistic basis for the activation of DNMT1, with consequences for basic research and drug design. |
リンク | Nat Commun / PubMed:36414620 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.23 - 3.52 Å |
構造データ | EMDB-33200, PDB-7xi9: EMDB-33201, PDB-7xib: EMDB-33298: Cryo-EM map of apo-DNMT1 (aa:351-1616) EMDB-33299: Cryo-EM map of DNMT1 (aa:351-1616) in complex with ubiquitinated H3 |
化合物 | ChemComp-ZN: ChemComp-SAH: ChemComp-HOH: |
由来 |
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キーワード | TRANSFERASE/DNA / DNA methyltransferase / TRANSFERASE-DNA COMPLEX |