T cell receptor beta variable 19 (TRBV19) (TRBV19)

The T cell receptor Vβ17 subfamily, systematically known as T cell receptor beta variable 19 (TRBV19), is a specific segment of the variable region of the T-cell receptor beta chain (IMGT, 2023). It plays a fundamental role in the adaptive immune system by facilitating the recognition of diverse antigens presented by MHC molecules, thereby initiating T-cell activation and proliferation (UniProt, 2024). This subfamily is clinically significant due to its high affinity for certain bacterial superantigens, most notably Staphylococcal enterotoxin B (SEB), which can cross-link the TCR Vβ17 region with MHC class II molecules independently of the specific peptide being presented (PubMed: 31159215). This interaction leads to the massive, non-specific activation of T-cells, resulting in a systemic cytokine storm and conditions such as toxic shock syndrome and severe food poisoning (PubMed: 29755540). In the context of therapeutic development, Vβ17 is considered a target for monoclonal antibodies and small molecules designed to block superantigen binding or to deplete specific T-cell populations in autoimmune diseases where Vβ17 expansion is observed (PubMed: 15634887). Monitoring the frequency of Vβ17-positive T-cells serves as a biomarker for immune repertoire shifts during infection or immunotherapy.

Other names

T-cell receptor Vβ17TCR Vbeta17TRBV19T cell receptor beta variable 19Vβ17 subfamily

Selective binding and modulation of T-cells expressing the Vβ17 variable region to inhibit superantigen-induced activation or deplete pathogenic T-cell clones.