cIAP1-BIR3 domain in complex with the Smac-mimetic compound Smac066

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

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Recognition of Smac-mimetic compounds by the BIR3 domain of cIAP1

Cossu, F.Malvezzi, F.Canevari, G.Mastrangelo, E.Lecis, D.Delia, D.Seneci, P.Scolastico, C.Bolognesi, M.Milani, M.

(2010) Protein Sci 

  • DOI: https://doi.org/10.1002/pro.523
  • Primary Citation of Related Structures:  
    3MUP, 3OZ1

  • PubMed Abstract: 

    Inhibitor of apoptosis proteins (IAPs) are negative regulators of apoptosis. As IAPs are overexpressed in many tumors, where they confer chemoresistance, small molecules inactivating IAPs have been proposed as anticancer agents. Accordingly, a number of IAP-binding pro-apoptotic compounds that mimic the sequence corresponding to the N-terminal tetrapeptide of Smac/DIABLO, the natural endogenous IAPs inhibitor, have been developed. Here, we report the crystal structures of the BIR3 domain of cIAP1 in complex with Smac037, a Smac-mimetic known to bind potently to the XIAP-BIR3 domain and to induce degradation of cIAP1, and in complex with the novel Smac-mimetic compound Smac066. Thermal stability and fluorescence polarization assays show the stabilizing effect and the high affinity of both Smac037 and Smac066 for cIAP1- and cIAP2-BIR3 domains.

  • Organizational Affiliation

    Dipartimento di Scienze Biomolecolari e Biotecnologie, Università di Milano, Via Celoria 26, I-20133, Milano, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Baculoviral IAP repeat-containing protein 2
A, B, C, D
122Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q13490 (Homo sapiens)
Explore Q13490 
Go to UniProtKB:  Q13490
GTEx:  ENSG00000110330 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13490
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
BMB PDBBind:  3OZ1 IC50: 2 (nM) from 1 assay(s)
BindingDB:  3OZ1 IC50: 2 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.589α = 90
b = 114.63β = 90
c = 92.962γ = 90
Software Package:
Software NamePurpose
DNAdata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references, Derived calculations