3TIX

Crystal structure of the Chp1-Tas3 complex core

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.212 

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
  • Primary Citation of Related Structures:  
    3TIX

  • 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 noncoding RNAs to chromatin ...

    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: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ubiquitin-like protein SMT3,RNA-induced transcriptional silencing complex protein tas3A, C207Saccharomyces cerevisiae S288C, Schizosaccharomyces pombe 972h-
This entity is chimeric		Mutation(s): 0 
Gene Names: SMT3, YDR510W, D9719.15, tas3, SPBC83.03c
UniProt
Find proteins for O94687 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore O94687 
Go to UniProtKB:  O94687
Find proteins for Q12306 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q12306 
Go to UniProtKB:  Q12306
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsO94687Q12306
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Chromo domain-containing protein 1B, D458Schizosaccharomyces pombe 972h-Mutation(s): 0 
Gene Names: chp1, SPAC18G6.02c
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
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.212 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.88α = 90
b = 172.2β = 90
c = 198.68γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
HKL2Mapmodel building
SHELXmodel building
SHARPphasing
PHENIXrefinement
XDSdata reduction
XDSdata scaling
HKL2Mapphasing
SHELXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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