2OOB image
Deposition Date 2007-01-25
Release Date 2007-02-06
Last Version Date 2023-08-30
Entry Detail
PDB ID:
2OOB
Keywords:
Title:
crystal structure of the UBA domain from Cbl-b ubiquitin ligase in complex with ubiquitin
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Bos taurus (Taxon ID: 9913)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
I 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:E3 ubiquitin-protein ligase CBL-B
Gene (Uniprot):CBLB
Chain IDs:A
Chain Length:52
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Ubiquitin
Chain IDs:B
Chain Length:76
Number of Molecules:1
Biological Source:Bos taurus
Primary Citation
Structural basis for ubiquitin-mediated dimerization and activation of the ubiquitin protein ligase Cbl-b.
Mol.Cell 27 474 485 (2007)
PMID: 17679095 DOI: 10.1016/j.molcel.2007.06.023

Abstact

Cbl proteins are E3 ubiquitin ligases that are negative regulators of many receptor tyrosine kinases. Cbl-b and c-Cbl contain a ubiquitin-associated (UBA) domain, which is present in a variety of proteins involved in ubiquitin-mediated processes. Despite high sequence identity, Cbl UBA domains display remarkably different ubiquitin-binding properties. Here, we report the crystal structure of the UBA domain of Cbl-b in complex with ubiquitin at 1.9 A resolution. The structure reveals an atypical mechanism of ubiquitin recognition by the first helix of the UBA. Helices 2 and 3 of the UBA domain form a second binding surface, which mediates UBA dimerization in the crystal and in solution. Site-directed mutagenesis demonstrates that Cbl-b dimerization is regulated by ubiquitin binding and required for tyrosine phosphorylation of Cbl-b and ubiquitination of Cbl-b substrates. These studies demonstrate a role for ubiquitin in regulating biological activity by promoting protein dimerization.

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