Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 21.13 kDa 
• Atom Count: 1579 
• Modelled Residue Count: 179 
• Deposited Residue Count: 183 
• Unique protein chains: 2

2VOH

Structure of mouse A1 bound to the Bak BH3-domain

• DOI: 10.2210/pdb2VOH/pdb

• Classification: APOPTOSIS
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2008-02-17 Released: 2008-03-04 
• Deposition Author(s): Smits, C., Czabotar, P.E., Hinds, M.G., Day, C.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.229 
• R-Value Work: 0.182 
• R-Value Observed: 0.185 

Literature

Structural Plasticity Underpins Promiscuous Binding of the Prosurvival Protein A1.

Smits, C., Czabotar, P.E., Hinds, M.G., Day, C.L.

(2008) Structure 16: 818

• PubMed: 18462686 
• DOI: 10.1016/j.str.2008.02.009
• Primary Citation of Related Structures:  
  2VOF, 2VOG, 2VOH, 2VOI


• PubMed Abstract: 
  

Apoptotic pathways are regulated by protein-protein interactions. Interaction of the BH3 domains of proapoptotic Bcl-2 family proteins with the hydrophobic groove of prosurvival proteins is critical. Whereas some BH3 domains bind in a promiscuous manner, others exhibit considerable selectivity and the sequence characteristics that distinguish these activities are unclear. In this study, crystal structures of complexes between the prosurvival protein A1 and the BH3 domains from Puma, Bmf, Bak, and Bid have been solved. The structure of A1 is similar to that of other prosurvival proteins, although features, such as an acidic patch in the binding groove, may allow specific therapeutic modulation of apoptosis. Significant conformational plasticity was observed in the intermolecular interactions and these differences explain some of the variation in affinity. This study, in combination with published data, suggests that interactions between conserved residues demarcate optimal binding.

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Organizational Affiliation: 

Biochemistry Department, University of Otago, Dunedin 9054, New Zealand.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BCL-2-RELATED PROTEIN A1	A	157	Mus musculus	Mutation(s): 2  Gene Names: Bcl2a1, A1, Bcl2a1a, Bfl1
UniProt
Find proteins for Q07440 (Mus musculus) Explore Q07440  Go to UniProtKB:  Q07440

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
BCL-2 HOMOLOGOUS ANTAGONIST/KILLER	B	26	Mus musculus	Mutation(s): 0  Gene Names: Bak1, Bak
UniProt
Find proteins for O08734 (Mus musculus) Explore O08734  Go to UniProtKB:  O08734

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CIT	C [auth A]	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N
SO4	D [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.229 
• R-Value Work: 0.182 
• R-Value Observed: 0.185 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 44.239	α = 90
b = 33.255	β = 104.67
c = 58.508	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-02-17 
• Released Date: 2008-03-04 
Deposition Author(s): Smits, C., Czabotar, P.E., Hinds, M.G., Day, C.L.

Revision History  

• Version 1.0: 2008-03-04
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance