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 

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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 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
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(by identity cutoff)  |  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
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
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Chromo domain-containing protein 1B, D458Schizosaccharomyces pombe 972h-Mutation(s): 0 
Gene Names: chp1, SPAC18G6.02c
Find proteins for Q10103 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore Q10103 
Go to UniProtKB:  Q10103
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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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • 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