Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | 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: 39.47 kDa 
• Atom Count: 2845 
• Modelled Residue Count: 330 
• Deposited Residue Count: 345 
• Unique protein chains: 1

3T6P

IAP antagonist-induced conformational change in cIAP1 promotes E3 ligase activation via dimerization

• PDB DOI: 10.2210/pdb3T6P/pdb

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


• Deposited: 2011-07-28 Released: 2011-11-02 
• Deposition Author(s): Dueber, E.C., Schoeffler, A.J., Lingel, A., Elliott, M., Fedorova, A.V., Giannetti, A.M., Zobel, K., Maurer, B., Varfolomeev, E., Wu, P., Wallweber, H., Hymowitz, S., Deshayes, K., Vucic, D., Fairbrother, W.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.233 
• R-Value Work: 0.191 
• R-Value Observed: 0.193 

Literature

Antagonists induce a conformational change in cIAP1 that promotes autoubiquitination.

Dueber, E.C., Schoeffler, A.J., Lingel, A., Elliott, J.M., Fedorova, A.V., Giannetti, A.M., Zobel, K., Maurer, B., Varfolomeev, E., Wu, P., Wallweber, H.J., Hymowitz, S.G., Deshayes, K., Vucic, D., Fairbrother, W.J.

(2011) Science 334: 376-380

• PubMed: 22021857 
• DOI: 10.1126/science.1207862
• Primary Citation of Related Structures:  
  3T6P


• PubMed Abstract: 
  

Inhibitor of apoptosis (IAP) proteins are negative regulators of cell death. IAP family members contain RING domains that impart E3 ubiquitin ligase activity. Binding of endogenous or small-molecule antagonists to select baculovirus IAP repeat (BIR) domains within cellular IAP (cIAP) proteins promotes autoubiquitination and proteasomal degradation and so releases inhibition of apoptosis mediated by cIAP. Although the molecular details of antagonist-BIR domain interactions are well understood, it is not clear how this binding event influences the activity of the RING domain. Here biochemical and structural studies reveal that the unliganded, multidomain cIAP1 sequesters the RING domain within a compact, monomeric structure that prevents RING dimerization. Antagonist binding induces conformational rearrangements that enable RING dimerization and formation of the active E3 ligase.

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Organizational Affiliation: 

Department of Early Discovery Biochemistry, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Baculoviral IAP repeat-containing protein 2	A	345	Homo sapiens	Mutation(s): 1  Gene Names: API1, BIRC2, IAP2, MIHB, RNF48 EC: 2.3.2.27
UniProt & NIH Common Fund Data Resources
Find proteins for Q13490 (Homo sapiens) Explore Q13490  Go to UniProtKB:  Q13490
PHAROS:  Q13490

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.233 
• R-Value Work: 0.191 
• R-Value Observed: 0.193 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 37.971	α = 90
b = 85.432	β = 90
c = 106.484	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-07-28 
• Released Date: 2011-11-02 
Deposition Author(s): Dueber, E.C., Schoeffler, A.J., Lingel, A., Elliott, M., Fedorova, A.V., Giannetti, A.M., Zobel, K., Maurer, B., Varfolomeev, E., Wu, P., Wallweber, H., Hymowitz, S., Deshayes, K., Vucic, D., Fairbrother, W.J.

Revision History  

• Version 1.0: 2011-11-02
  Type: Initial release