6FTO

Crystal structure of the Chp2 chromoshadow domain in complex with N-terminal domain of chromatin remodeler Mit1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Transcriptional gene silencing requires dedicated interaction between HP1 protein Chp2 and chromatin remodeler Mit1.

Leopold, K.Stirpe, A.Schalch, T.

(2019) Genes Dev. 33: 565-577

  • DOI: 10.1101/gad.320440.118

  • PubMed Abstract: 
  • Heterochromatin protein 1 (HP1) proteins are key factors of eukaryotic heterochromatin that coordinate chromatin compaction and transcriptional gene silencing. Through their multivalency they act as adaptors between histone H3 Lys9 di/trimethyl marks ...

    Heterochromatin protein 1 (HP1) proteins are key factors of eukaryotic heterochromatin that coordinate chromatin compaction and transcriptional gene silencing. Through their multivalency they act as adaptors between histone H3 Lys9 di/trimethyl marks in chromatin and effector complexes that bind to the HP1 chromoshadow domain. Most organisms encode for multiple HP1 isoforms and the molecular mechanisms that underpin their diverse functions in genome regulation remain poorly understood. In fission yeast, the two HP1 proteins Chp2 and Swi6 assume distinct roles and Chp2 is tightly associated with the nucleosome remodeling and deacetylation complex SHREC. Here we show that Chp2 directly engages the SHREC nucleosome remodeler subunit Mit1. The crystal structure of the interaction interface reveals an extraordinarily extensive and specific interaction between the chromoshadow domain of Chp2 and the N terminus of Mit1. The integrity of this interface is critical for high affinity binding and for heterochromatin formation. Comparison with Swi6 shows that the Chp2-Mit1 interface is highly selective and thereby provides the molecular basis for the functional specialization of an HP1 isoform.


    Organizational Affiliation

    Department of Molecular Biology, Faculty of Science, Sciences III, University of Geneva, CH-1211 Geneva 4, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chromo domain-containing protein 2
A, B
66Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: chp2
Find proteins for O42934 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  O42934
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chromatin remodeling factor mit1
C
81Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: mit1
EC: 3.6.4.-
Find proteins for Q9P793 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  Q9P793
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEZ
Query on HEZ

Download SDF File 
Download CCD File 
A, B
HEXANE-1,6-DIOL
C6 H14 O2
XXMIOPMDWAUFGU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.171 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 58.053α = 90.00
b = 58.053β = 90.00
c = 139.492γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHENIXrefinement
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerlandPP00P3_139137
Swiss National Science FoundationSwitzerlandPP00P3_163760_1
Swiss National Science FoundationSwitzerlandPP00P3_172904

Revision History 

  • Version 1.0: 2019-03-27
    Type: Initial release
  • Version 1.1: 2019-05-15
    Type: Data collection, Database references