Ovalbumin-specific T-cell receptor (OVA-TCR) (OVA-TCR)

The Ovalbumin-specific T-cell receptor (OVA-TCR) is a well-characterized antigen receptor used extensively in immunological research to model T-cell activation and development (Hogquist et al., 1994, Cell). It is most commonly studied in the context of OT-I and OT-II transgenic mouse lines, where the TCR is engineered to recognize specific peptides derived from chicken egg ovalbumin (OVA). The OT-I TCR specifically recognizes the SIINFEKL peptide (OVA 257-264) presented by the MHC class I molecule H-2Kb, while the OT-II TCR recognizes the OVA 323-339 peptide presented by the MHC class II molecule I-Ab (Barnden et al., 1998, Immunol Cell Biol). Binding of the OVA-TCR to its cognate peptide-MHC complex triggers a signaling cascade through the CD3 complex, involving kinases like Lck and ZAP-70, which ultimately leads to T-cell proliferation and effector function (Murphy et al., Janeway's Immunobiology). This receptor system serves as a critical tool for testing novel immunotherapies, including TCR-engineered T-cell (TCR-T) platforms and checkpoint inhibitors (Pauken & Wherry, 2015, Trends in Immunology). It is also used to investigate the mechanisms of immune tolerance, autoimmunity, and the kinetics of the immune response in vivo.

Other names

OT-I T-cell receptorOT-II T-cell receptorSIINFEKL-specific TCROVA-specific TCROvalbumin-specific T-cell receptor recognizing OVA peptide–MHC complex

The OVA-TCR recognizes specific ovalbumin-derived peptides presented by the Major Histocompatibility Complex (MHC), triggering a signaling cascade through the CD3 complex that leads to T-cell proliferation, cytokine production, and cytotoxic activity (Murphy et al., Janeway's Immunobiology).