3TIX image
Deposition Date 2011-08-22
Release Date 2011-11-16
Last Version Date 2024-02-28
Entry Detail
PDB ID:
3TIX
Title:
Crystal structure of the Chp1-Tas3 complex core
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.24
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Ubiquitin-like protein SMT3,RNA-induced transcriptional silencing complex protein tas3
Gene (Uniprot):tas3, SMT3
Chain IDs:A, C
Chain Length:207
Number of Molecules:2
Biological Source:Saccharomyces cerevisiae, Schizosaccharomyces pombe
Polymer Type:polypeptide(L)
Molecule:Chromo domain-containing protein 1
Gene (Uniprot):chp1
Chain IDs:B, D
Chain Length:458
Number of Molecules:2
Biological Source:Schizosaccharomyces pombe (strain 972 / ATCC 24843)
Primary Citation
The Chp1-Tas3 core is a multifunctional platform critical for gene silencing by RITS.
Nat.Struct.Mol.Biol. 18 1351 1357 (2011)
PMID: 22081013 DOI: 10.1038/nsmb.2151

Abstact

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.

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