3TIX

Crystal structure of the Chp1-Tas3 complex core


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9001 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

The Chp1-Tas3 core is a multifunctional platform critical for gene silencing by RITS.

Schalch, T.Job, G.Shanker, S.Partridge, J.F.Joshua-Tor, L.

(2011) Nat.Struct.Mol.Biol. 18: 1351-1357

  • DOI: 10.1038/nsmb.2151

  • PubMed Abstract: 
  • RNA interference (RNAi) is critical for the assembly of heterochromatin at Schizosaccharomyces pombe centromeres. Central to this process is the RNA-induced initiation of transcriptional gene silencing (RITS) complex, which physically anchors small n ...

    RNA interference (RNAi) is critical for the assembly of heterochromatin at Schizosaccharomyces pombe centromeres. Central to this process is the RNA-induced initiation of transcriptional gene silencing (RITS) complex, which physically anchors small noncoding RNAs to chromatin. RITS includes Ago1, the chromodomain protein Chp1, and Tas3, which forms a bridge between Chp1 and Ago1. Chp1 is a large protein with no recognizable domains, apart from its chromodomain. Here we describe how the structured C-terminal half of Chp1 binds the Tas3 N-terminal domain, revealing the tight association of Chp1 and Tas3. The structure also shows a PIN domain at the C-terminal tip of Chp1 that controls subtelomeric transcripts through a post-transcriptional mechanism. We suggest that the Chp1-Tas3 complex provides a solid and versatile platform to recruit both RNAi-dependent and RNAi-independent gene-silencing pathways for locus-specific regulation of heterochromatin.


    Organizational Affiliation

    Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin-like protein SMT3,RNA-induced transcriptional silencing complex protein tas3
A, C
207Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Schizosaccharomyces pombe (strain 972 / ATCC 24843)
This entity is chimeric
Mutation(s): 0 
Gene Names: SMT3, tas3
Find proteins for Q12306 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q12306
Find proteins for O94687 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  O94687
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Chromo domain-containing protein 1
B, D
458Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: chp1
Find proteins for Q10103 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  Q10103
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
B, C, D
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B, C, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9001 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.211 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 104.880α = 90.00
b = 172.200β = 90.00
c = 198.680γ = 90.00
Software Package:
Software NamePurpose
HKL2Mapmodel building
SHELXphasing
PHENIXrefinement
SHELXmodel building
SHARPphasing
XDSdata reduction
XDSdata scaling
CBASSdata collection
HKL2Mapphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-11-16
    Type: Initial release
  • Version 1.1: 2011-12-07
    Type: Database references
  • Version 1.2: 2011-12-21
    Type: Database references
  • Version 1.3: 2017-06-07
    Type: Database references
  • Version 1.4: 2017-11-08
    Type: Refinement description