CD4+ T cell receptor complex recognizing Hepatitis C Virus peptide–MHC class II (CD4+ TCR-HCV-pMHCII)

The CD4+ T cell receptor complex recognizing Hepatitis C Virus (HCV) peptide–MHC class II is a critical mediator of the adaptive immune response against HCV infection (Source: PMID 15141013). This complex consists of the T-cell receptor (TCR) alpha and beta chains, the CD3 signaling subunits, and the CD4 co-receptor, which collectively recognize specific HCV-derived peptides presented by Major Histocompatibility Complex (MHC) class II molecules on antigen-presenting cells (Source: UniProt P01730, P07766). Activation of this complex is essential for the recruitment and help of other immune cells, such as B cells for antibody production and CD8+ T cells for viral clearance. In chronic HCV infection, this interaction is often impaired due to T-cell exhaustion or viral escape mutations in the targeted epitopes (Source: PMID 25831558). Therapeutic strategies targeting this complex include the development of peptide-based vaccines, such as IC41, designed to boost specific CD4+ T-cell responses, and the engineering of TCR-transduced T cells for adoptive immunotherapy (Source: PMID 18671478). Understanding the structural and functional nuances of this complex is vital for designing interventions that can overcome viral persistence and promote spontaneous or treatment-induced clearance of the virus.

Other names

HCV-specific CD4+ T-cell receptorMHC class II-restricted HCV-specific TCRTCR-CD3-CD4 complex (HCV-specific)Hepatitis C virus-specific T-cell receptor

The complex recognizes specific HCV peptides presented by MHC class II molecules, triggering signaling through the CD3 complex to activate CD4+ helper T cells, which coordinate the antiviral immune response (Source: PMID 11752708).