3GS2 image
Deposition Date 2009-03-26
Release Date 2010-08-25
Last Version Date 2024-02-21
Entry Detail
PDB ID:
3GS2
Keywords:
Title:
Ring1B C-terminal domain/Cbx7 Cbox Complex
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:E3 ubiquitin-protein ligase RING2
Gene (Uniprot):RNF2
Mutations:N306D
Chain IDs:A, C
Chain Length:111
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Chromobox protein homolog 7
Gene (Uniprot):CBX7
Chain IDs:B, D
Chain Length:30
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Polycomb Group Targeting through Different Binding Partners of RING1B C-Terminal Domain.
Structure 18 966 975 (2010)
PMID: 20696397 DOI: 10.1016/j.str.2010.04.013

Abstact

RING1B, a Polycomb Group (PcG) protein, binds methylated chromatin through its association with another PcG protein called Polycomb (Pc). However, RING1B can associate with nonmethylated chromatin suggesting an alternate mechanism for RING1B interaction with chromatin. Here, we demonstrate that two proteins with little sequence identity between them, the Pc cbox domain and RYBP, bind the same surface on the C-terminal domain of RING1B (C-RING1B). Pc cbox and RYBP each fold into a nearly identical, intermolecular beta sheet with C-RING1B and a loop structure which are completely different in the two proteins. Both the beta sheet and loop are required for stable binding and transcription repression. Further, a mutation engineered to disrupt binding on the Drosophila dRING1 protein prevents chromatin association and PcG function in vivo. These results suggest that PcG targeting to different chromatin locations relies, in part, on binding partners of C-RING1B that are diverse in sequence and structure.

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