Crystal structure of the Mud1 UBA domain

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.168 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Mechanism of Lys48-linked polyubiquitin chain recognition by the Mud1 UBA domain

Trempe, J.-F.Brown, N.R.Lowe, E.D.Gordon, C.Campbell, I.D.Noble, M.E.M.Endicott, J.A.

(2005) EMBO J 24: 3178-3189

  • DOI: https://doi.org/10.1038/sj.emboj.7600797
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The ubiquitin-pathway associated (UBA) domain is a 40-residue polyubiquitin-binding motif. The Schizosaccharomyces pombe protein Mud1 is an ortholog of the Saccharomyces cerevisiae DNA-damage response protein Ddi1 and binds to K48-linked polyubiquitin through its UBA domain. We have solved the crystal structure of Mud1 UBA at 1.8 angstroms resolution, revealing a canonical three-helical UBA fold. We have probed the interactions of this domain using mutagenesis, surface plasmon resonance, NMR and analytical ultracentrifugation. We show that the ubiquitin-binding surface of Mud1 UBA extends beyond previously recognized motifs and can be functionally dissected into primary and secondary ubiquitin-binding sites. Mutation of Phe330 to alanine, a residue exposed between helices 2 and 3, significantly reduces the affinity of the Mud1 UBA domain for K48-linked polyubiquitin, despite leaving the primary binding surface functionally intact. Moreover, K48-linked diubiquitin binds a single Mud1 UBA domain even in the presence of excess UBA. We therefore propose a mechanism for the recognition of K48-linked polyubiquitin chains by Mud1 in which diubiquitin units are specifically recognized by a single UBA domain.

  • Organizational Affiliation

    Laboratory of Molecular Biophysics, University of Oxford, Oxford, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UBA-domain protein mud1
A, B
40Schizosaccharomyces pombeMutation(s): 0 
Gene Names: mud1
Find proteins for Q10256 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore Q10256 
Go to UniProtKB:  Q10256
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ10256
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.168 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.601α = 90
b = 60.601β = 90
c = 96.35γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-10-04
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references