T cell receptor recognizing Ovalbumin-derived peptide-MHC complexes (OVA-specific TCR)

The T cell receptor (TCR) recognizing Ovalbumin (OVA)-derived peptide-MHC complexes is a fundamental tool in immunology, primarily utilized in the OT-I and OT-II transgenic mouse models (Hogquist et al., 1994, PMID: 7923351; Barnden et al., 1998, PMID: 9553774). These receptors are specifically engineered to recognize fragments of the chicken egg white protein ovalbumin (UniProt: P00698) when presented by the Major Histocompatibility Complex (MHC). The OT-I TCR recognizes the SIINFEKL peptide (OVA 257-264) in the context of MHC class I (H-2Kb), driving CD8+ cytotoxic T cell responses. Conversely, the OT-II TCR recognizes the OVA 323-339 peptide in the context of MHC class II (I-Ab), facilitating CD4+ helper T cell activation. These TCRs allow researchers to track and manipulate a uniform population of T cells with known antigen specificity, making them invaluable for studying T cell development, memory formation, and the efficacy of immunotherapies. While not a direct human therapeutic target, they serve as the gold-standard prototype for developing TCR-engineered T cell (TCR-T) therapies and vaccines (PubMed: 25108442). The interaction between the TCR and the OVA peptide-MHC complex triggers a signaling cascade through the CD3 complex, leading to T cell proliferation and effector function. This system is widely used to evaluate the potency of new immunomodulatory drugs and delivery vehicles in preclinical models.

Other names

OT-I TCROT-II TCROvalbumin-specific T cell receptorSIINFEKL-specific TCROVA-TCR

Binding of the TCR to the peptide-MHC complex triggers a signaling cascade through the CD3 complex, leading to T cell proliferation, cytokine production, and targeted cell lysis.