9MYS | pdb_00009mys

The cryo-EM structure of the mutant MHKKKQ DNMT1-umNCP complex

• PDB DOI: https://doi.org/10.2210/pdb9MYS/pdb
• EM Map EMD-48749: EMDB EMDataResource

• Classification: TRANSFERASE
• Organism(s): Homo sapiens, Xenopus laevis, Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2025-01-22 Released: 2026-09-09 
• Deposition Author(s): Fang, J., Song, J.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.93 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental

Literature

The DNMT1 CXXC domain senses CpG islands for DNA methylation inhibition

Fang, J., Song, J.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 9-mer - A2B2C2D2E1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 9-mer - A4B4C1 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Hetero 8-mer - A2B2C2D2 

Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Hetero 8-mer - A2B2C2D2 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 342.42 kDa 
• Atom Count: 19,120 
• Modeled Residue Count: 1,969 
• Deposited Residue Count: 2,532 
• Unique protein chains: 5
• Unique nucleic acid chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA (cytosine-5)-methyltransferase 1	A	1,250	Homo sapiens	Mutation(s): 6  Gene Names: DNMT1, AIM, CXXC9, DNMT EC: 2.1.1.37
UniProt & NIH Common Fund Data Resources
Find proteins for P26358 (Homo sapiens) Explore P26358  Go to UniProtKB:  P26358
PHAROS:  P26358 GTEx:  ENSG00000130816

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H2A	B [auth N], H [auth n]	130	Xenopus laevis	Mutation(s): 0  Gene Names: hist1h2aj, LOC494591, XELAEV_18003602mg
UniProt
Find proteins for Q6AZJ8 (Xenopus laevis) Explore Q6AZJ8  Go to UniProtKB:  Q6AZJ8

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H2B 1.1	C [auth O], I [auth o]	123	Xenopus laevis	Mutation(s): 1
UniProt
Find proteins for P02281 (Xenopus laevis) Explore P02281  Go to UniProtKB:  P02281

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H3	D [auth P], J [auth p]	136	Xenopus laevis	Mutation(s): 0  Gene Names: LOC121398065, LOC108703785, LOC121398067
UniProt
Find proteins for A0A310TTQ1 (Xenopus laevis) Explore A0A310TTQ1  Go to UniProtKB:  A0A310TTQ1

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H4	E [auth Q], K [auth q]	103	Xenopus laevis	Mutation(s): 0
UniProt
Find proteins for P62799 (Xenopus laevis) Explore P62799  Go to UniProtKB:  P62799

Entity ID: 6
Molecule	Chains	Length	Organism	Image
Nucleosome 601 DNA (149-MER)	F [auth X]	149	Escherichia coli

Entity ID: 7
Molecule	Chains	Length	Organism	Image
Nucleosome 601 DNA (149-MER)	G [auth Y]	149	Escherichia coli

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN (Subject of Investigation/LOI)	L [auth A], M [auth A], N [auth A], O [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
ML3	E [auth Q], K [auth q]	L-PEPTIDE LINKING	C8 H19 N2 O2 S		LYS

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.93 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX
RECONSTRUCTION	PHENIX

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-09-09 
Deposition Author(s): Fang, J., Song, J.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	1R35GM119721

Revision History  

• Version 1.0: 2026-09-09
  Type: Initial release