CD4+ T-cell receptor recognizing SARS-CoV-2 spike protein-derived peptides (SARS-CoV-2 S-specific CD4+ TCR)

CD4+ T-cell receptors (TCRs) recognizing SARS-CoV-2 S-2P-derived peptides are specialized immune receptors that play a pivotal role in the adaptive immune response to COVID-19. The S-2P antigen is a stabilized form of the SARS-CoV-2 spike protein, modified with two proline substitutions (K986P and V987P) to preserve its prefusion structure, which is the primary target for neutralizing antibodies and T-cell recognition (Wrapp et al., Science, 2020). These TCRs function by binding to specific peptide fragments of the spike protein presented by Major Histocompatibility Complex (MHC) Class II molecules on antigen-presenting cells (Grifoni et al., Cell, 2020). This interaction triggers the activation and differentiation of CD4+ helper T cells, which are essential for orchestrating B-cell antibody production and supporting CD8+ cytotoxic T-cell responses (Sahin et al., Nature, 2020). In the context of vaccination, drugs such as BNT162b2 and mRNA-1273 are designed to induce the expression of the S-2P protein, thereby generating a robust population of these specific TCR-bearing T cells to provide long-term immunity (Jackson et al., NEJM, 2020). Monitoring the frequency and diversity of these receptors serves as a critical biomarker for assessing vaccine efficacy and the breadth of protection against emerging viral variants. Furthermore, research into these TCRs helps identify immunodominant epitopes that can be used to design next-generation vaccines and provides insights into pre-existing immunity and cross-reactivity with other coronaviruses (Mateus et al., Science, 2020).

Other names

Spike-specific TCRSARS-CoV-2 reactive T-cell receptorS-2P-specific CD4+ TCRSARS-CoV-2 spike-specific CD4+ T-cell receptor

These receptors recognize SARS-CoV-2 spike protein peptides presented by MHC class II molecules, leading to T-cell activation, cytokine secretion, and coordination of the adaptive immune response (Grifoni et al., Cell, 2020; Sahin et al., Nature, 2020).