2XG7

Crystal Structure of BST2-Tetherin Ectodomain expressed in HEK293T cells


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.45 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.269 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and Functional Studies on the Extracellular Domain of Bst2/Tetherin in Reduced and Oxidized Conformations.

Schubert, H.L.Zhai, Q.Sandrin, V.Eckert, D.M.Garcia-Maya, M.Saul, L.Sundquist, W.I.Steiner, R.A.Hill, C.P.

(2010) Proc.Natl.Acad.Sci.USA 107: 17951

  • DOI: 10.1073/pnas.1008206107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • HIV-1 and other enveloped viruses can be restricted by a host cellular protein called BST2/tetherin that prevents release of budded viruses from the cell surface. Mature BST2 contains a small cytosolic region, a predicted transmembrane helix, and an ...

    HIV-1 and other enveloped viruses can be restricted by a host cellular protein called BST2/tetherin that prevents release of budded viruses from the cell surface. Mature BST2 contains a small cytosolic region, a predicted transmembrane helix, and an extracellular domain with a C-terminal GPI anchor. To advance understanding of BST2 function, we have determined a 2.6 Å crystal structure of the extracellular domain of the bacterially expressed recombinant human protein, residues 47-152, under reducing conditions. The structure forms a single long helix that associates as a parallel dimeric coiled coil over its C-terminal two-thirds, while the N-terminal third forms an antiparallel four-helix bundle with another dimer, creating a global tetramer. We also report the 3.45 Å resolution structure of BST2(51-151) prepared by expression as a secreted protein in HEK293T cells. This oxidized construct forms a dimer in the crystal that is superimposable with the reduced protein over the C-terminal two-thirds of the molecule, and its N terminus suggests pronounced flexibility. Hydrodynamic data demonstrated that BST2 formed a stable tetramer under reducing conditions and a dimer when oxidized to form disulfide bonds. A mutation that selectively disrupted the tetramer (L70D) increased protein expression modestly but only reduced antiviral activity by approximately threefold. Our data raise the possibility that BST2 may function as a tetramer at some stage, such as during trafficking, and strongly support a model in which the primary functional state of BST2 is a parallel disulfide-bound coiled coil that displays flexibility toward its N terminus.


    Organizational Affiliation

    Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112-5650, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BONE MARROW STROMAL ANTIGEN 2
A, C
103Homo sapiensMutation(s): 0 
Gene Names: BST2
Find proteins for Q10589 (Homo sapiens)
Go to Gene View: BST2
Go to UniProtKB:  Q10589
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.45 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.269 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 28.860α = 90.00
b = 91.860β = 90.00
c = 146.960γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
PHASERphasing
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-05-31 
  • Released Date: 2010-10-13 
  • Deposition Author(s): Steiner, R.A.

Revision History 

  • Version 1.0: 2010-10-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance