Crystal structure of the FAF1 UBX domain

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.178 

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This is version 1.3 of the entry. See complete history


Hierarchical Binding of Cofactors to the AAA ATPase p97.

Hanzelmann, P.Buchberger, A.Schindelin, H.

(2011) Structure 19: 833-843

  • DOI: https://doi.org/10.1016/j.str.2011.03.018
  • Primary Citation of Related Structures:  
    3QQ7, 3QQ8, 3R3M

  • PubMed Abstract: 

    The hexameric AAA ATPase p97 is involved in several human proteinopathies and mediates ubiquitin-dependent protein degradation among other essential cellular processes. Via its N-terminal domain (N domain), p97 interacts with multiple regulatory cofactors including the UFD1/NPL4 heterodimer and members of the "ubiquitin regulatory X" (UBX) domain protein family; however, the principles governing cofactor selectivity remain to be deciphered. Our crystal structure of the FAS-associated factor 1 (FAF1)UBX domain in complex with the p97N domain reveals that the signature Phe-Pro-Arg motif known to be crucial for interactions of UBX domains with p97 adopts a cis-proline configuration, in contrast to a cis-trans mixture we derive for the isolated FAF1UBX domain. Biochemical studies confirm that binding critically depends on a proline at this position. Furthermore, we observe that the UBX proteins FAF1 and UBXD7 only bind to p97-UFD1/NPL4, but not free p97, thus demonstrating for the first time a hierarchy in p97-cofactor interactions.

  • Organizational Affiliation

    Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, Josef-Schneider-Str. 2, 97080 Würzburg, Germany. petra.haenzelmann@virchow.uni-wuerzburg.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FAS-associated factor 1A [auth B],
B [auth A],
85Homo sapiensMutation(s): 0 
Gene Names: FAF1UBXD12UBXN3ACGI-03
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UNN5 (Homo sapiens)
Explore Q9UNN5 
Go to UniProtKB:  Q9UNN5
GTEx:  ENSG00000185104 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UNN5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.178 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.755α = 90
b = 92.755β = 90
c = 108.5γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
MxCuBEdata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-06-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2019-07-17
    Changes: Data collection, Refinement description
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description