3G7L

Chromodomain of Chp1 in complex with Histone H3K9me3 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

High-affinity binding of Chp1 chromodomain to K9 methylated histone H3 is required to establish centromeric heterochromatin

Schalch, T.Job, G.Noffsinger, V.J.Shanker, S.Kuscu, C.Joshua-Tor, L.Partridge, J.F.

(2009) Mol Cell 34: 36-46

  • DOI: https://doi.org/10.1016/j.molcel.2009.02.024
  • Primary Citation of Related Structures:  
    3G7L

  • PubMed Abstract: 

    In fission yeast, assembly of centromeric heterochromatin requires the RITS complex, which consists of Ago1, Tas3, Chp1, and siRNAs derived from centromeric repeats. Recruitment of RITS to centromeres has been proposed to depend on siRNA-dependent targeting of Ago1 to centromeric sequences. Previously, we demonstrated that methylated lysine 9 of histone H3 (H3K9me) acts upstream of siRNAs during heterochromatin establishment. Our crystal structure of Chp1's chromodomain in complex with a trimethylated lysine 9 H3 peptide reveals extensive sites of contact that contribute to Chp1's high-affinity binding. We found that this high-affinity binding is critical for the efficient establishment of centromeric heterochromatin, but preassembled heterochromatin can be maintained when Chp1's affinity for H3K9me is greatly reduced.


  • Organizational Affiliation

    Keck Structural Biology Laboratory, Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chromo domain-containing protein 161Schizosaccharomyces pombeMutation(s): 0 
Gene Names: chp1SPAC18G6.02c
UniProt
Find proteins for Q10103 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore Q10103 
Go to UniProtKB:  Q10103
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ10103
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H3.1/H3.2B [auth P]16N/AMutation(s): 1 
UniProt
Find proteins for P09988 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore P09988 
Go to UniProtKB:  P09988
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09988
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.200 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.56α = 90
b = 41.56β = 90
c = 87.38γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-04-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-09-06
    Changes: Data collection, Refinement description