3NOB image
Entry Detail
PDB ID:
3NOB
Keywords:
Title:
Structure of K11-linked di-ubiquitin
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2010-06-25
Release Date:
2010-08-11
Method Details:
Experimental Method:
Resolution:
2.19 Å
R-Value Free:
0.28
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Ubiquitin
Chain IDs:A, B, C, D, E, F, G, H
Chain Length:78
Number of Molecules:8
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
K11-Linked Polyubiquitination in Cell Cycle Control Revealed by a K11 Linkage-Specific Antibody.
Mol.Cell 39 477 484 (2010)
PMID: 20655260 DOI: 10.1016/j.molcel.2010.07.001

Abstact

Polyubiquitination is a posttranslational modification where ubiquitin chains containing isopeptide bonds linking one of seven ubiquitin lysines with the C terminus of an adjoining ubiquitin are covalently attached to proteins. While functions of K48- and K63-linked polyubiquitin are understood, the role(s) of noncanonical K11-linked chains is less clear. A crystal structure of K11-linked diubiquitin demonstrates a distinct conformation from K48- or K63-linked diubiquitin. We engineered a K11 linkage-specific antibody and use it to demonstrate that K11 chains are highly upregulated in mitotic human cells precisely when substrates of the ubiquitin ligase anaphase-promoting complex (APC/C) are degraded. These chains increased with proteasomal inhibition, suggesting they act as degradation signals in vivo. Inhibition of the APC/C strongly impeded the formation of K11-linked chains, suggesting that a single ubiquitin ligase is the major source of mitotic K11-linked chains. Our results underscore the importance of K11-linked ubiquitin chains as critical regulators of mitotic protein degradation.

Legend

Protein

Chemical

Disease

Primary Citation of related structures