2B2Y

Tandem chromodomains of human CHD1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Double chromodomains cooperate to recognize the methylated histone H3 tail.

Flanagan, J.F.Mi, L.Z.Chruszcz, M.Cymborowski, M.Clines, K.L.Kim, Y.Minor, W.Rastinejad, F.Khorasanizadeh, S.

(2005) Nature 438: 1181-1185

  • DOI: https://doi.org/10.1038/nature04290
  • Primary Citation of Related Structures:  
    2B2T, 2B2U, 2B2V, 2B2W, 2B2Y

  • PubMed Abstract: 

    Chromodomains are modules implicated in the recognition of lysine-methylated histone tails and nucleic acids. CHD (for chromo-ATPase/helicase-DNA-binding) proteins regulate ATP-dependent nucleosome assembly and mobilization through their conserved double chromodomains and SWI2/SNF2 helicase/ATPase domain. The Drosophila CHD1 localizes to the interbands and puffs of the polytene chromosomes, which are classic sites of transcriptional activity. Other CHD isoforms (CHD3/4 or Mi-2) are important for nucleosome remodelling in histone deacetylase complexes. Deletion of chromodomains impairs nucleosome binding and remodelling by CHD proteins. Here we describe the structure of the tandem arrangement of the human CHD1 chromodomains, and its interactions with histone tails. Unlike HP1 and Polycomb proteins that use single chromodomains to bind to their respective methylated histone H3 tails, the two chromodomains of CHD1 cooperate to interact with one methylated H3 tail. We show that the human CHD1 double chromodomains target the lysine 4-methylated histone H3 tail (H3K4me), a hallmark of active chromatin. Methylammonium recognition involves two aromatic residues, not the three-residue aromatic cage used by chromodomains of HP1 and Polycomb proteins. Furthermore, unique inserts within chromodomain 1 of CHD1 block the expected site of H3 tail binding seen in HP1 and Polycomb, instead directing H3 binding to a groove at the inter-chromodomain junction.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Genetics, University of Virginia Health System, Charlottesville, Virginia 22908, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chromodomain-helicase-DNA-binding protein 1
A, B
187Homo sapiensMutation(s): 0 
Gene Names: CHD1
EC: 3.6.4.12
UniProt & NIH Common Fund Data Resources
Find proteins for O14646 (Homo sapiens)
Explore O14646 
Go to UniProtKB:  O14646
PHAROS:  O14646
GTEx:  ENSG00000153922 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14646
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Chromodomain-helicase-DNA-binding protein 1115Homo sapiensMutation(s): 0 
Gene Names: CHD1
EC: 3.6.4.12
UniProt & NIH Common Fund Data Resources
Find proteins for O14646 (Homo sapiens)
Explore O14646 
Go to UniProtKB:  O14646
PHAROS:  O14646
GTEx:  ENSG00000153922 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14646
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.215 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.27α = 90
b = 55.031β = 112.42
c = 101.55γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
PDB_EXTRACTdata extraction
MAR345data collection
HKL-2000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-12-27
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2022-04-13
    Changes: Database references, Structure summary
  • Version 1.5: 2023-08-23
    Changes: Data collection, Refinement description