3EB5

Structure of the cIAP2 RING domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of the cIAP2 RING domain reveal conformational changes associated with ubiquitin-conjugating enzyme (E2) recruitment.

Mace, P.D.Linke, K.Feltham, R.Schumacher, F.R.Smith, C.A.Vaux, D.L.Silke, J.Day, C.L.

(2008) J.Biol.Chem. 283: 31633-31640

  • DOI: 10.1074/jbc.M804753200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Inhibitor of apoptosis (IAP) proteins are key negative regulators of cell death that are highly expressed in many cancers. Cell death caused by antagonists that bind to IAP proteins is associated with their ubiquitylation and degradation. The RING do ...

    Inhibitor of apoptosis (IAP) proteins are key negative regulators of cell death that are highly expressed in many cancers. Cell death caused by antagonists that bind to IAP proteins is associated with their ubiquitylation and degradation. The RING domain at the C terminus of IAP proteins is pivotal. Here we report the crystal structures of the cIAP2 RING domain homodimer alone, and bound to the ubiquitin-conjugating (E2) enzyme UbcH5b. These structures show that small changes in the RING domain accompany E2 binding. By mutating residues at the E2-binding surface, we show that autoubiquitylation is required for regulation of IAP abundance. Dimer formation is also critical, and mutation of a single C-terminal residue abrogated dimer formation and E3 ligase activity was diminished. We further demonstrate that disruption of E2 binding, or dimerization, stabilizes IAP proteins against IAP antagonists in vivo.


    Organizational Affiliation

    Biochemistry Department, University of Otago, Dunedin 9054, New Zealand.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Baculoviral IAP repeat-containing protein 3
A
74Homo sapiensMutation(s): 0 
Gene Names: BIRC3 (API2, MIHC, RNF49)
EC: 2.3.2.27
Find proteins for Q13489 (Homo sapiens)
Go to Gene View: BIRC3
Go to UniProtKB:  Q13489
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.213 
  • Space Group: C 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 34.869α = 90.00
b = 66.474β = 90.00
c = 77.465γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
MOSFLMdata reduction
REFMACrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-09-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance