Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 22.44 kDa 
• Atom Count: 1681 
• Residue Count: 182 
• Unique protein chains: 1

3NI0

Crystal Structure of Mouse BST-2/Tetherin Ectodomain

• DOI: 10.2210/pdb3NI0/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2010-06-14 Released: 2010-11-17 
• Deposition Author(s): Scheaffer, S.M., Brett, T.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.237 
• R-Value Work: 0.214 
• R-Value Observed: 0.215 

Literature

Structural and Biophysical Analysis of BST-2/Tetherin Ectodomains Reveals an Evolutionary Conserved Design to Inhibit Virus Release.

Swiecki, M., Scheaffer, S.M., Allaire, M., Fremont, D.H., Colonna, M., Brett, T.J.

(2011) J Biol Chem 286: 2987-2997

• PubMed: 21084286 
• DOI: 10.1074/jbc.M110.190538
• Structures With Same Primary Citation


• PubMed Abstract: 
  

BST-2/tetherin is a host antiviral molecule that functions to potently inhibit the release of enveloped viruses from infected cells. In return, viruses have evolved antagonists to this activity. BST-2 traps budding virions by using two separate membrane-anchoring regions that simultaneously incorporate into the host and viral membranes. Here, we detailed the structural and biophysical properties of the full-length BST-2 ectodomain, which spans the two membrane anchors. The 1.6-Å crystal structure of the complete mouse BST-2 ectodomain reveals an ∼145-Å parallel dimer in an extended α-helix conformation that predominantly forms a coiled coil bridged by three intermolecular disulfides that are required for stability. Sequence analysis in the context of the structure revealed an evolutionarily conserved design that destabilizes the coiled coil, resulting in a labile superstructure, as evidenced by solution x-ray scattering displaying bent conformations spanning 150 and 180 Å for the mouse and human BST-2 ectodomains, respectively. Additionally, crystal packing analysis revealed possible curvature-sensing tetrameric structures that may aid in proper placement of BST-2 during the genesis of viral progeny. Overall, this extended coiled-coil structure with inherent plasticity is undoubtedly necessary to accommodate the dynamics of viral budding while ensuring separation of the anchors.

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Organizational Affiliation: 

Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Bone marrow stromal antigen 2	A, B	99	Mus musculus	Mutation(s): 0  Gene Names: Bst2
Find proteins for Q8R2Q8 (Mus musculus) Explore Q8R2Q8  Go to UniProtKB:  Q8R2Q8

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IPA	A	ISOPROPYL ALCOHOL C3 H8 O KFZMGEQAYNKOFK-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.237 
• R-Value Work: 0.214 
• R-Value Observed: 0.215 
• Space Group: I 2₁ 2₁ 2₁
• Diffraction Data DOI: 10.15785/SBGRID/28 SBGrid

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 33.685	α = 90
b = 100.831	β = 90
c = 110.432	γ = 90

Software Package:

Software Name	Purpose
Blu-Ice	data collection
PHASER	phasing
PHENIX	refinement
HKL-2000	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-06-14 
• Released Date: 2010-11-17 
Deposition Author(s): Scheaffer, S.M., Brett, T.J.

Revision History 

• Version 1.0: 2010-11-17
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance