8VC7 image
Entry Detail
PDB ID:
8VC7
Title:
Crystal Structure of Human BTN2A1 ectodomain in complex with Antagonist 2A1.9 Fab
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-12-13
Release Date:
2024-12-18
Method Details:
Experimental Method:
Resolution:
2.76 Å
R-Value Free:
0.26
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Butyrophilin subfamily 2 member A1
Mutations:C219S
Chain IDs:C, F (auth: E)
Chain Length:231
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Human IgG1 Fragment Antibody Light Chain
Chain IDs:A (auth: D), D (auth: A)
Chain Length:215
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Human IgG1 Fragment Antibody Heavy Chain
Chain IDs:B (auth: J), E (auth: B)
Chain Length:233
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Mapping the extracellular molecular architecture of the pAg-signaling complex with alpha-Butyrophilin antibodies.
Sci Rep 15 12162 12162 (2025)
PMID: 40204806 DOI: 10.1038/s41598-025-94347-w

Abstact

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.

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Primary Citation of related structures