Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Protein Workshop | Ligand Explorer

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

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

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 20375.54 
• Atom Count: 1340 
• Residue Count: 176 
• Unique protein chains: 2

4J44

Crystal structure of XIAP-BIR2 domain with AIAV bound

• DOI: 10.2210/pdb4J44/pdb

• Classification: APOPTOSIS
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 2 


• Deposited: 2013-02-06 Released: 2013-09-25 
• Deposition Author(s): Lukacs, C.M., Janson, C.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.3 Å
• R-Value Free: 0.193 
• R-Value Work: 0.173 

Literature

The structure of XIAP BIR2: understanding the selectivity of the BIR domains.

Lukacs, C., Belunis, C., Crowther, R., Danho, W., Gao, L., Goggin, B., Janson, C.A., Li, S., Remiszewski, S., Schutt, A., Thakur, M.K., Singh, S.K., Swaminathan, S., Pandey, R., Tyagi, R., Gosu, R., Kamath, A.V., Kuglstatter, A.

(2013) Acta Crystallogr.,Sect.D 69: 1717-1725

• PubMed: 23999295 
• DOI: 10.1107/S0907444913016284
• Primary Citation of Related Structures:  
  4J48, 4J47, 4J46, 4J45, 4J3Y


• PubMed Abstract: 
  

XIAP, a member of the inhibitor of apoptosis family of proteins, is a critical regulator of apoptosis. Inhibition of the BIR domain-caspase interaction is a promising approach towards treating cancer. Previous work has been directed towards inhibiting the BIR3-caspase-9 interaction, which blocks the intrinsic apoptotic pathway; selectively inhibiting the BIR2-caspase-3 interaction would also block the extrinsic pathway. The BIR2 domain of XIAP has successfully been crystallized; peptides and small-molecule inhibitors can be soaked into these crystals, which diffract to high resolution. Here, the BIR2 apo crystal structure and the structures of five BIR2-tetrapeptide complexes are described. The structural flexibility observed on comparing these structures, along with a comparison with XIAP BIR3, affords an understanding of the structural elements that drive selectivity between BIR2 and BIR3 and which can be used to design BIR2-selective inhibitors.

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Organizational Affiliation: 

Discovery Technologies, Hoffmann-La Roche, 340 Kingsland Street, Nutley, NJ 07110, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
E3 ubiquitin-protein ligase XIAP	A, C	86	Homo sapiens	Mutation(s): 2  Gene Names: XIAP (API3, BIRC4, IAP3) EC: 2.3.2.27
Find proteins for P98170 (Homo sapiens) Go to Gene View: XIAP Go to UniProtKB:  P98170

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
PEPTIDE (ALA-ILE-ALA-VAL)	B	4	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A, C	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.3 Å
• R-Value Free: 0.193 
• R-Value Work: 0.173 
• Space Group: I 4 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 74.889	α = 90.00
b = 74.889	β = 90.00
c = 109.022	γ = 90.00

Software Package:

Software Name	Purpose
CNX	refinement
REFMAC	refinement
SCALA	data scaling
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-02-06 
• Released Date: 2013-09-25 
• Deposition Author(s): Lukacs, C.M., Janson, C.A.

Revision History 

• Version 1.0: 2013-09-25
  Type: Initial release