3OS5 image
Deposition Date 2010-09-08
Release Date 2010-12-15
Last Version Date 2023-09-06
Entry Detail
PDB ID:
3OS5
Keywords:
Title:
SET7/9-Dnmt1 K142me1 complex
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.69 Å
R-Value Free:
0.23
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Histone-lysine N-methyltransferase SETD7
Gene (Uniprot):SETD7
Chain IDs:A
Chain Length:256
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MLZ B LYS N-METHYL-LYSINE
Primary Citation
A methylation and phosphorylation switch between an adjacent lysine and serine determines human DNMT1 stability.
Nat.Struct.Mol.Biol. 18 42 48 (2011)
PMID: 21151116 DOI: 10.1038/nsmb.1939

Abstact

The protein lysine methyltransferase SET7 regulates DNA methyltransferase-1 (DNMT1) activity in mammalian cells by promoting degradation of DNMT1 and thus allows epigenetic changes via DNA demethylation. Here we reveal an interplay between monomethylation of DNMT1 Lys142 by SET7 and phosphorylation of DNMT1 Ser143 by AKT1 kinase. These two modifications are mutually exclusive, and structural analysis suggests that Ser143 phosphorylation interferes with Lys142 monomethylation. AKT1 kinase colocalizes and directly interacts with DNMT1 and phosphorylates Ser143. Phosphorylated DNMT1 peaks during DNA synthesis, before DNMT1 methylation. Depletion of AKT1 or overexpression of dominant-negative AKT1 increases methylated DNMT1, resulting in a decrease in DNMT1 abundance. In mammalian cells, phosphorylated DNMT1 is more stable than methylated DNMT1. These results reveal cross-talk on DNMT1, through modifications mediated by AKT1 and SET7, that affects cellular DNMT1 levels.

Legend

Protein

Chemical

Disease

Primary Citation of related structures