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Vγ9Vδ2 T cells recognize phosphoantigens (PAg) via butyrophilins (BTN). This review proposes a composite ligand model for Vγ9Vδ2 T-cell receptor activation, detailing PAg binding and complex formation.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Biochemistry

Background:

  • Vγ9Vδ2 T cells are key immune cells with antimicrobial and antitumor potential.
  • Their activation relies on the Vγ9Vδ2 T-cell receptor (TCR) interacting with phosphoantigens (PAg).
  • PAg are intermediates of isoprenoid synthesis, elevated in certain cancers and after aminobisphosphonate treatment.

Purpose of the Study:

  • To review progress in understanding phosphoantigen (PAg) recognition by Vγ9Vδ2 T cells.
  • To investigate the interaction between butyrophilins (BTN) and PAg.
  • To propose a model for Vγ9Vδ2 T-cell receptor activation complex formation.

Main Methods:

  • Literature review focusing on PAg recognition and BTN interactions.
  • Phylogenetic analysis of butyrophilins and Vγ9Vδ2 T cells, including human and alpaca comparisons.
  • Development of a composite ligand model for Vγ9Vδ2 TCR activation.

Main Results:

  • A composite ligand model is proposed, involving BTN3A1-A2/A3 heteromers and BTN2A1 homodimers forming the Vγ9Vδ2 TCR activating complex.
  • PAg binding to the intracellular BTN3A1-B30.2 domain initiates complex formation with BTN2A1 B30.2 domains.
  • Extracellular interactions involve BTN2A1-IgV binding to Vγ9-TCR framework and BTN3A-IgV to TCR complementarity determining regions.

Conclusions:

  • The proposed model provides a framework for understanding PAg-recognition and Vγ9Vδ2 T-cell activation.
  • Further research is needed to address unresolved questions regarding the structural basis and physiological consequences of PAg recognition.
  • This work highlights the importance of BTN-PAg interactions in Vγ9Vδ2 T cell immunity and immunotherapy.