T-cell receptor:peptide-major histocompatibility complex (TCR/pMHC complex)

The T-cell receptor:peptide-major histocompatibility complex (TCR/pMHC) complex is formed when a T-cell receptor on the surface of a T lymphocyte engages with an antigenic peptide presented by a major histocompatibility complex (MHC) molecule on an antigen-presenting cell[1][2][5][7]. This interaction is essential for the activation of T cells, driving adaptive immune responses against infections and tumors[1][4][7]. Upon binding, the TCR transduces downstream signals via associated CD3 subunits, initiating cellular activation[3][4][7]. The specificity and strength of TCR/pMHC interactions determine immune recognition, tolerance, and memory formation[1][2][4]. Structurally, the complex consists of multiple protein subunits and is stabilized by diverse interactions at the membrane[1][5][9]. Therapies that engineer or modulate this complex underlie modern immunotherapies for cancer, chronic infection, and autoimmune disease[1][4][5].

Other names

T-cell receptor/peptide-MHC complexTCR:pMHCTCR-MHC complexTCR:antigen-MHC complexT-cell receptor-antigen-MHC complex

Selective activation or inhibition of TCR signaling Modulation of antigen presentation to TCR Engineering TCR specificity to recognize selected pMHC complexes Enhancing or blocking T cell responses via manipulating the TCR/pMHC interface