2I0I

X-ray crystal structure of Sap97 PDZ3 bound to the C-terminal peptide of HPV18 E6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structures of a Human Papillomavirus (HPV) E6 Polypeptide Bound to MAGUK Proteins: Mechanisms of Targeting Tumor Suppressors by a High-Risk HPV Oncoprotein.

Zhang, Y.Dasgupta, J.Ma, R.Z.Banks, L.Thomas, M.Chen, X.S.

(2007) J Virol 81: 3618-3626

  • DOI: 10.1128/JVI.02044-06
  • Primary Citation of Related Structures:  
    2I04, 2I0L, 2I0I

  • PubMed Abstract: 
  • Human papillomavirus (HPV) E6 oncoprotein targets certain tumor suppressors such as MAGI-1 and SAP97/hDlg for degradation. A short peptide at the C terminus of E6 interacts specifically with the PDZ domains of these tumor suppressors, which is a prop ...

    Human papillomavirus (HPV) E6 oncoprotein targets certain tumor suppressors such as MAGI-1 and SAP97/hDlg for degradation. A short peptide at the C terminus of E6 interacts specifically with the PDZ domains of these tumor suppressors, which is a property unique to high-risk HPVs that are associated with cervical cancer. The detailed recognition mechanisms between HPV E6 and PDZ proteins are unclear. To understand the specific binding of cellular PDZ substrates by HPV E6, we have solved the crystal structures of the complexes containing a peptide from HPV18 E6 bound to three PDZ domains from MAGI-1 and SAP97/Dlg. The complex crystal structures reveal novel features of PDZ peptide recognition that explain why high-risk HPV E6 can specifically target these cellular tumor suppressors for destruction. Moreover, a new peptide-binding loop on these PDZs is identified as interacting with the E6 peptide. Furthermore, we have identified an arginine residue, unique to high-risk HPV E6 but outside the canonical core PDZ recognition motif, that plays an important role in the binding of the PDZs of both MAGI-I and SAP97/Dlg, the mutation of which abolishes E6's ability to degrade the two proteins. Finally, we have identified a dimer form of MAGI-1 PDZ domain 1 in the cocrystal structure with E6 peptide, which may have functional relevance for MAGI-1 activity. In addition to its novel insights into the biochemistry of PDZ interactions, this study is important for understanding HPV-induced oncogenesis; this could provide a basis for developing antiviral and anticancer compounds.


    Related Citations: 
    • HPV E6 and MAGUK protein interactions: determination of the molecular basis for specific protein recognition and degradation.
      Thomas, M., Glaunsinger, B., Pim, D., Javier, R., Banks, L.
      (2001) Oncogene 20: 5431

    Organizational Affiliation

    Molecular and Computational Biology, University of Southern California, 1050 Childs Way, MCB201, Los Angeles, CA 90089, USA.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
peptide E6DEF7N/AMutation(s): 0 
Find proteins for P06463 (Human papillomavirus type 18)
Explore P06463 
Go to UniProtKB:  P06463
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Disks large homolog 1ABC85Rattus norvegicusMutation(s): 0 
Gene Names: Dlg1Dlgh1
Find proteins for Q62696 (Rattus norvegicus)
Explore Q62696 
Go to UniProtKB:  Q62696
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.223 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.167α = 90
b = 61.919β = 123.33
c = 57.142γ = 90
Software Package:
Software NamePurpose
CNSrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-02-20
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance