8v9u
From Proteopedia
Solution NMR structure of human DNMT1 N-terminal alpha-helical domain
Structural highlights
DiseaseDNMT1_HUMAN Defects in DNMT1 are the cause of hereditary sensory neuropathy type 1E (HSN1E) [MIM:614116. A neurodegenerative disorder characterized by adult onset of progressive peripheral sensory loss associated with progressive hearing impairment and early-onset dementia.[1] FunctionDNMT1_HUMAN Methylates CpG residues. Preferentially methylates hemimethylated DNA. Associates with DNA replication sites in S phase maintaining the methylation pattern in the newly synthesized strand, that is essential for epigenetic inheritance. Associates with chromatin during G2 and M phases to maintain DNA methylation independently of replication. It is responsible for maintaining methylation patterns established in development. DNA methylation is coordinated with methylation of histones. Mediates transcriptional repression by direct binding to HDAC2. In association with DNMT3B and via the recruitment of CTCFL/BORIS, involved in activation of BAG1 gene expression by modulating dimethylation of promoter histone H3 at H3K4 and H3K9.[2] [3] [4] Publication Abstract from PubMedIn vertebrates, DNA methyltransferase 1 (DNMT1) contributes to preserving DNA methylation patterns, ensuring the stability and heritability of epigenetic marks important for gene expression regulation and the maintenance of cellular identity. Previous structural studies have elucidated the catalytic mechanism of DNMT1 and its specific recognition of hemimethylated DNA. Here, using solution nuclear magnetic resonance spectroscopy and small-angle X-ray scattering, we demonstrate that the N-terminal region of human DNMT1, while flexible, encompasses a conserved globular domain with a novel alpha-helical bundle-like fold. This work expands our understanding of the structure and dynamics of DNMT1 and provides a structural framework for future functional studies in relation with this new domain. Identification of a conserved alpha-helical domain at the N terminus of human DNA methyltransferase 1.,Hu Q, Botuyan MV, Mer G J Biol Chem. 2024 Mar;300(3):105775. doi: 10.1016/j.jbc.2024.105775. Epub 2024 , Feb 19. PMID:38382673[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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