1I3O

CRYSTAL STRUCTURE OF THE COMPLEX OF XIAP-BIR2 AND CASPASE 3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.248 

Starting Models: experimental
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This is version 1.4 of the entry. See complete history


Literature

Structural basis for the inhibition of caspase-3 by XIAP.

Riedl, S.J.Renatus, M.Schwarzenbacher, R.Zhou, Q.Sun, C.Fesik, S.W.Liddington, R.C.Salvesen, G.S.

(2001) Cell 104: 791-800

  • DOI: https://doi.org/10.1016/s0092-8674(01)00274-4
  • Primary Citation of Related Structures:  
    1I3O

  • PubMed Abstract: 

    The molecular mechanism(s) that regulate apoptosis by caspase inhibition remain poorly understood. The main endogenous inhibitors are members of the IAP family and are exemplified by XIAP, which regulates the initiator caspase-9, and the executioner caspases-3 and -7. We report the crystal structure of the second BIR domain of XIAP (BIR2) in complex with caspase-3, at a resolution of 2.7 A, revealing the structural basis for inhibition. The inhibitor makes limited contacts through its BIR domain to the surface of the enzyme, and most contacts to caspase-3 originate from the N-terminal extension. This lies across the substrate binding cleft, but in reverse orientation compared to substrate binding. The mechanism of inhibition is due to a steric blockade prohibitive of substrate binding, and is distinct from the mechanism utilized by synthetic substrate analog inhibitors.


  • Organizational Affiliation

    The Program in Apoptosis and Cell, Death Research, The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CASPASE 3
A, C
175Homo sapiensMutation(s): 1 
Gene Names: I39005
EC: 3.4.22
UniProt & NIH Common Fund Data Resources
Find proteins for P42574 (Homo sapiens)
Explore P42574 
Go to UniProtKB:  P42574
PHAROS:  P42574
GTEx:  ENSG00000164305 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42574
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CASPASE 3
B, D
110Homo sapiensMutation(s): 0 
Gene Names: I39005
EC: 3.4.22
UniProt & NIH Common Fund Data Resources
Find proteins for P42574 (Homo sapiens)
Explore P42574 
Go to UniProtKB:  P42574
PHAROS:  P42574
GTEx:  ENSG00000164305 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42574
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
BACULOVIRAL IAP REPEAT-CONTAINING PROTEIN 4
E, F
121Homo sapiensMutation(s): 2 
Gene Names: U32974
UniProt & NIH Common Fund Data Resources
Find proteins for P98170 (Homo sapiens)
Explore P98170 
Go to UniProtKB:  P98170
PHAROS:  P98170
GTEx:  ENSG00000101966 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP98170
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
G [auth E],
H [auth F]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.248 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.7α = 90
b = 95.5β = 90
c = 144.2γ = 90
Software Package:
Software NamePurpose
SOLVEphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-03-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-09
    Changes: Data collection, Refinement description