2XL3 image
Deposition Date 2010-07-19
Release Date 2010-08-04
Last Version Date 2023-12-20
Entry Detail
PDB ID:
2XL3
Keywords:
Title:
WDR5 IN COMPLEX WITH AN RBBP5 PEPTIDE AND HISTONE H3 PEPTIDE
Biological Source:
Source Organism:
MUS MUSCULUS (Taxon ID: 10090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.70 Å
R-Value Free:
0.23
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:WD REPEAT-CONTAINING PROTEIN 5
Gene (Uniprot):Wdr5
Chain IDs:A, B
Chain Length:334
Number of Molecules:2
Biological Source:MUS MUSCULUS
Polymer Type:polypeptide(L)
Molecule:RETINOBLASTOMA-BINDING PROTEIN 5
Gene (Uniprot):Rbbp5
Chain IDs:C, E
Chain Length:14
Number of Molecules:2
Biological Source:MUS MUSCULUS
Polymer Type:polypeptide(L)
Molecule:HISTONE H3.1
Gene (Uniprot):H3c1, H3c8, H3c10, H3c11
Chain IDs:D, F
Chain Length:9
Number of Molecules:2
Biological Source:MUS MUSCULUS
Ligand Molecules
Primary Citation
Characterisation of a Novel Wdr5 Binding Site that Recruits Rbbp5 Through a Conserved Motif and Enhances Methylation of H3K4 by Mll1.
J.Biol.Chem. 285 32967 ? (2010)
PMID: 20716525 DOI: 10.1074/JBC.M110.159921

Abstact

Histone modification is well established as a fundamental mechanism driving the regulation of transcription, replication, and DNA repair through the control of chromatin structure. Likewise, it is apparent that incorrect targeting of histone modifications contributes to misregulated gene expression and hence to developmental disorders and diseases of genomic instability such as cancer. The KMT2 family of SET domain methyltransferases, typified by mixed lineage leukemia protein-1 (MLL1), is responsible for histone H3 lysine 4 methylation, a marker of active genes. To ensure that this modification is correctly targeted, a multiprotein complex associates with the methyltransferase and directs activity. We have identified a novel interaction site on the core complex protein WD repeat protein-5 (WDR5), and we mapped the complementary site on its partner retinoblastoma-binding protein-5 (RbBP5). We have characterized this interaction by x-ray crystallography and show how it is fundamental to the assembly of the complex and to the regulation of methyltransferase activity. We show which region of RbBP5 contributes directly to mixed lineage leukemia activation, and we combine our structural and biochemical data to produce a model to show how WDR5 and RbBP5 act cooperatively to stimulate activity.

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Primary Citation of related structures