Crystal Structure of BST2-Tetherin Ectodomain expressed in HEK293T cells

Experimental Data Snapshot

  • Resolution: 3.45 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.270 

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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 U S A 107: 17951

  • DOI: https://doi.org/10.1073/pnas.1008206107
  • Primary Citation of Related Structures:  
    2XG7, 3NWH

  • 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 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
B [auth C]
103Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q10589 (Homo sapiens)
Explore Q10589 
Go to UniProtKB:  Q10589
PHAROS:  Q10589
GTEx:  ENSG00000130303 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ10589
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAG

Download Ideal Coordinates CCD File 
C [auth A],
D [auth C]
C8 H15 N O6
Experimental Data & Validation

Experimental Data

  • Resolution: 3.45 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.270 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 28.86α = 90
b = 91.86β = 90
c = 146.96γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-10-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary
  • Version 1.4: 2023-12-20
    Changes: Data collection, Database references, Refinement description, Structure summary