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CRYSTAL STRUCTURE OF SMAC/DIABLO


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.245 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and biochemical basis of apoptotic activation by Smac/DIABLO.

Chai, J.Du, C.Wu, J.W.Kyin, S.Wang, X.Shi, Y.

(2000) Nature 406: 855-862

  • DOI: 10.1038/35022514

  • PubMed Abstract: 
  • Apoptosis (programmed cell death), an essential process in the development and homeostasis of metazoans, is carried out by caspases. The mitochondrial protein Smac/DIABLO performs a critical function in apoptosis by eliminating the inhibitory effect ...

    Apoptosis (programmed cell death), an essential process in the development and homeostasis of metazoans, is carried out by caspases. The mitochondrial protein Smac/DIABLO performs a critical function in apoptosis by eliminating the inhibitory effect of IAPs (inhibitor of apoptosis proteins) on caspases. Here we show that Smac/DIABLO promotes not only the proteolytic activation of procaspase-3 but also the enzymatic activity of mature caspase-3, both of which depend upon its ability to interact physically with IAPs. The crystal structure of Smac/DIABLO at 2.2 A resolution reveals that it homodimerizes through an extensive hydrophobic interface. Missense mutations inactivating this dimeric interface significantly compromise the function of Smac/DIABLO. As in the Drosophila proteins Reaper, Grim and Hid, the amino-terminal amino acids of Smac/DIABLO are indispensable for its function, and a seven-residue peptide derived from the amino terminus promotes procaspase-3 activation in vitro. These results establish an evolutionarily conserved structural and biochemical basis for the activation of apoptosis by Smac/DIABLO.


    Organizational Affiliation

    Department of Molecular Biology, Princeton University, New Jersey 08544, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SECOND MITOCHONDRIA-DERIVED ACTIVATOR OF CASPASES
A
184Homo sapiensGene Names: DIABLO (SMAC)
Find proteins for Q9NR28 (Homo sapiens)
Go to Gene View: DIABLO
Go to UniProtKB:  Q9NR28
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.245 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 108.500α = 90.00
b = 108.500β = 90.00
c = 70.400γ = 120.00
Software Package:
Software NamePurpose
DMmodel building
CNSrefinement
DENZOdata reduction
DMphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2000-07-23 
  • Released Date: 2000-09-13 
  • Deposition Author(s): Chai, J., Shi, Y.

Revision History 

  • Version 1.0: 2000-09-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance