Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 14.73 kDa 
• Atom Count: 1029 
• Modelled Residue Count: 104 
• Deposited Residue Count: 126 
• Unique protein chains: 2

1SE0

Crystal structure of DIAP1 BIR1 bound to a Grim peptide

• PDB DOI: 10.2210/pdb1SE0/pdb

• Classification: APOPTOSIS
• Organism(s): Drosophila melanogaster
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-02-15 Released: 2004-04-27 
• Deposition Author(s): Yan, N., Wu, J.W., Shi, Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.250 
• R-Value Work: 0.212 
• R-Value Observed: 0.220 

Literature

Molecular mechanisms of DrICE inhibition by DIAP1 and removal of inhibition by Reaper, Hid and Grim.

Yan, N., Wu, J.W., Chai, J., Li, W., Shi, Y.

(2004) Nat Struct Mol Biol 11: 420-428

• PubMed: 15107838 
• DOI: 10.1038/nsmb764
• Primary Citation of Related Structures:  
  1SDZ, 1SE0


• PubMed Abstract: 
  

The Drosophila melanogaster inhibitor of apoptosis protein DIAP1 suppresses apoptosis in part through inhibition of the effector caspase DrICE. The pro-death proteins Reaper, Hid and Grim (RHG) induce apoptosis by antagonizing DIAP1 function. However, the underlying molecular mechanisms remain unknown. Here we demonstrate that DIAP1 directly inhibits the catalytic activity of DrICE through its BIR1 domain and this inhibition is countered effectively by the RHG proteins. Inhibition of DrICE by DIAP1 occurs only after the cleavage of its N-terminal 20 amino acids and involves a conserved surface groove on BIR1. Crystal structures of BIR1 bound to the RHG peptides show that the RHG proteins use their N-terminal IAP-binding motifs to bind to the same surface groove, hence relieving DIAP1-mediated inhibition of DrICE. These studies define novel molecular mechanisms for the inhibition and activation of a representative D. melanogaster effector caspase.

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Organizational Affiliation: 

Department of Molecular Biology, Princeton University, Lewis Thomas Laboratory, Washington Road, Princeton, New Jersey 08544, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Apoptosis 1 inhibitor	A	116	Drosophila melanogaster	Mutation(s): 0  Gene Names: Iap1, th, Diap1, CG12284 EC: 2.3.2.27
UniProt
Find proteins for Q24306 (Drosophila melanogaster) Explore Q24306  Go to UniProtKB:  Q24306

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Cell death protein Grim	B	10	N/A	Mutation(s): 0
UniProt
Find proteins for Q24570 (Drosophila melanogaster) Explore Q24570  Go to UniProtKB:  Q24570

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.250 
• R-Value Work: 0.212 
• R-Value Observed: 0.220 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 84.783	α = 90
b = 84.783	β = 90
c = 49.789	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-02-15 
• Released Date: 2004-04-27 
Deposition Author(s): Yan, N., Wu, J.W., Shi, Y.

Revision History  

• Version 1.0: 2004-04-27
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance