Domain swapped E6AP C-lobe dimer

Experimental Data Snapshot

  • Resolution: 1.30 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 

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Crystal structure of the catalytic C-lobe of the HECT-type ubiquitin ligase E6AP.

Ries, L.K.Liess, A.K.L.Feiler, C.G.Spratt, D.E.Lowe, E.D.Lorenz, S.

(2020) Protein Sci 29: 1550-1554

  • DOI: https://doi.org/10.1002/pro.3832
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The HECT-type ubiquitin ligase E6AP (UBE3A) is critically involved in several neurodevelopmental disorders and human papilloma virus-induced cervical tumorigenesis; the structural mechanisms underlying the activity of this crucial ligase, however, are incompletely understood. Here, we report a crystal structure of the C-terminal lobe ("C-lobe") of the catalytic domain of E6AP that reveals two molecules in a domain-swapped, dimeric arrangement. Interestingly, the molecular hinge that enables this structural reorganization with respect to the monomeric fold coincides with the active-site region. While such dimerization is unlikely to occur in the context of full-length E6AP, we noticed a similar domain swap in a crystal structure of the isolated C-lobe of another HECT-type ubiquitin ligase, HERC6. This may point to conformational strain in the active-site region of HECT-type ligases with possible implications for catalysis. SIGNIFICANCE STATEMENT: The HECT-type ubiquitin ligase E6AP has key roles in human papilloma virus-induced cervical tumorigenesis and certain neurodevelopmental disorders. Here, we present a crystal structure of the C-terminal, catalytic lobe of E6AP, providing basic insight into the conformational properties of this functionally critical region of HECT-type ligases.

  • Organizational Affiliation

    Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, Würzburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquitin-protein ligase E3AA [auth C]105Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q05086 (Homo sapiens)
Explore Q05086 
Go to UniProtKB:  Q05086
GTEx:  ENSG00000114062 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ05086
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.30 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.28α = 90
b = 72.28β = 90
c = 98.974γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PDB_EXTRACTdata extraction
Aimlessdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanyLO 2003/1-1

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-26
    Type: Initial release
  • Version 1.1: 2020-06-10
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Derived calculations, Refinement description