8VC7 | pdb_00008vc7

Crystal Structure of Human BTN2A1 ectodomain in complex with Antagonist 2A1.9 Fab


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Free: 
    0.261 (Depositor), 0.260 (DCC) 
  • R-Value Work: 
    0.218 (Depositor), 0.218 (DCC) 
  • R-Value Observed: 
    0.219 (Depositor) 

Starting Models: experimental
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This is version 1.1 of the entry. See complete history


Literature

Mapping the extracellular molecular architecture of the pAg-signaling complex with alpha-Butyrophilin antibodies.

Ramesh, A.Roy, S.Slezak, T.Fuller, J.Graves, H.Mamedov, M.R.Marson, A.Kossiakoff, A.A.Adams, E.J.

(2025) Sci Rep 15: 12162-12162

  • DOI: https://doi.org/10.1038/s41598-025-94347-w
  • Primary Citation of Related Structures:  
    8VC7, 9DPE

  • PubMed Abstract: 

    Target cells trigger Vγ9Vδ2 T cell activation by signaling the intracellular accumulation of phospho-antigen metabolites (pAgs) through Butyrophilin (BTN)-3A1 and BTN2A1 to the Vγ9Vδ2 T cell receptor (TCR). An incomplete understanding of the molecular dynamics in this signaling complex hampers Vγ9Vδ2 T cell immunotherapeutic efficacy. A panel of engineered α-BTN3A1 and α-BTN2A1 antibody (mAb) reagents was used to probe the roles of BTN3A1 and BTN2A1 in pAg signaling. Modified α-BTN3A1 mAbs with increased inter-Fab distances establish that tight clustering of BTN3A1 is not necessary to stimulate Vγ9Vδ2 T cell activation, and that antagonism may occur through occlusion of a critical binding interaction between BTN3A1 and a yet unknown co-receptor. Finally, a panel of additional α-BTN2A1 antagonists utilize different biophysical mechanisms to compete with Vγ9Vδ2 TCRs for BTN2A1 binding. The complex structures of BTN2A1 ectodomain and Fabs from three antagonist mAbs provide molecular insights into BTN2A1 epitopes critical for pAg-signaling.


  • Organizational Affiliation
    • Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, USA.

Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Human IgG1 Fragment Antibody Light ChainA [auth D],
D [auth A]
215Homo sapiensMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Human IgG1 Fragment Antibody Heavy ChainB [auth J],
E [auth B]
233Homo sapiensMutation(s): 0 
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Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Butyrophilin subfamily 2 member A1C,
F [auth E]
231Homo sapiensMutation(s): 1 
Gene Names: BTN2A1BT2.1BTF1
UniProt & NIH Common Fund Data Resources
Find proteins for Q7KYR7 (Homo sapiens)
Explore Q7KYR7 
Go to UniProtKB:  Q7KYR7
PHAROS:  Q7KYR7
GTEx:  ENSG00000112763 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7KYR7
Glycosylation
Glycosylation Sites: 3Go to GlyGen: Q7KYR7-2
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Free:  0.261 (Depositor), 0.260 (DCC) 
  • R-Value Work:  0.218 (Depositor), 0.218 (DCC) 
  • R-Value Observed: 0.219 (Depositor) 
Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.915α = 90
b = 200.976β = 90
c = 206.684γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2024-12-18
    Type: Initial release
  • Version 1.1: 2025-04-23
    Changes: Database references