22PC | pdb_000022pc

Crystal structure of the histone-binding motif of ATRX in complex with H3-H4-ASF1

• PDB DOI: https://doi.org/10.2210/pdb22PC/pdb

• Classification: NUCLEAR PROTEIN
• Organism(s): Xenopus laevis, Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2026-01-19 Released: 2026-10-28 
• Deposition Author(s): Yan, S., Chen, Y.
• Funding Organization(s): Ministry of Science and Technology (MoST, China)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 
  0.263 (Depositor), 0.262 (DCC) 
• R-Value Work: 
  0.224 (Depositor), 0.226 (DCC) 
• R-Value Observed: 
  0.226 (Depositor) 

Starting Model: experimental

Literature

Structural basis for the non-canonical nucleosome remodeling by ATRX

Wang, X., Yan, S., Huang, Y., Ge, K., Wu, Y., Xu, W., Kang, Y., Yao, D., Liu, X., Chen, Y.

(2026) Mol Cell 

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 80.81 kDa 
• Atom Count: 5,084 
• Modeled Residue Count: 652 
• Deposited Residue Count: 716 
• Unique protein chains: 4

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H3	A, D [auth E]	84	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: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H4	B, E [auth F]	88	Homo sapiens	Mutation(s): 0  Gene Names:  H4C1, H4/A, H4FA, HIST1H4A, H4C2, H4/I, H4FI, HIST1H4B, H4C3, H4/G, H4FG, HIST1H4C, H4C4, H4/B, H4FB, HIST1H4D, H4C5, H4/J, H4FJ, HIST1H4E, H4C6, H4/C, H4FC, HIST1H4F, H4C8, H4/H, H4FH, HIST1H4H, H4C9, H4/M, H4FM, HIST1H4I, H4C11, H4/E, H4FE, HIST1H4J, H4C12, H4/D, H4FD, HIST1H4K, H4C13, H4/K, H4FK, HIST1H4L, H4C14, H4/N, H4F2, H4FN, HIST2H4, HIST2H4A, H4C15, H4/O, H4FO, HIST2H4B, H4C16, H4-16, HIST4H4
UniProt & NIH Common Fund Data Resources
Find proteins for P62805 (Homo sapiens) Explore P62805  Go to UniProtKB:  P62805
PHAROS:  P62805 GTEx:  ENSG00000274618 ENSG00000197238 ENSG00000197837 ENSG00000158406 ENSG00000278705 ENSG00000197061 ENSG00000270882 ENSG00000270276 ENSG00000273542 ENSG00000277157 ENSG00000276966 ENSG00000276180 ENSG00000278637 ENSG00000275126

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone chaperone ASF1B	C, F [auth G]	163	Homo sapiens	Mutation(s): 0  Gene Names: ASF1B
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NVP2 (Homo sapiens) Explore Q9NVP2  Go to UniProtKB:  Q9NVP2
PHAROS:  Q9NVP2 GTEx:  ENSG00000105011

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Transcriptional regulator ATRX	G [auth D], H	23	Homo sapiens	Mutation(s): 0  Gene Names: ATRX, RAD54L, XH2 EC: 3.6.4.12 (PDB Primary Data), 3.6.4 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P46100 (Homo sapiens) Explore P46100  Go to UniProtKB:  P46100
PHAROS:  P46100 GTEx:  ENSG00000085224

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free:  0.263 (Depositor), 0.262 (DCC) 
• R-Value Work:  0.224 (Depositor), 0.226 (DCC) 
• R-Value Observed: 0.226 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.406	α = 90
b = 90.928	β = 94.11
c = 70.815	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data scaling
HKL-2000	data reduction
PHASER	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-10-28 
Deposition Author(s): Yan, S., Chen, Y.

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Funding Organization	Location	Grant Number
Ministry of Science and Technology (MoST, China)	China	2023YFA1800403

Revision History  

• Version 1.0: 2026-10-28
  Type: Initial release