Antigen Processing

Antigen Processing describes the intracellular enzymatic degradation of proteins into peptide fragments within antigen-presenting cells, followed by loading onto major histocompatibility complex molecules for surface display and T cell activation, representing the molecular basis of adaptive immune recognition essential for vaccine immunogenicity and autoimmune pathogenesis.

The biopharmaceutical industry studies antigen processing for vaccine design, predicting immunogenicity of therapeutic proteins, and understanding autoimmune disease mechanisms. Vaccine antigens must be efficiently processed and presented by relevant MHC alleles to activate appropriate T cell responses. Immunogenicity prediction algorithms assess whether therapeutic protein sequences contain peptide sequences efficiently processed and presented to potentially elicit T cell responses against the drug. Epitope identification studies map processed peptides activating patient T cells. MHC class I processing through proteasomal degradation activates CD8+ T cells, while class II endosomal processing activates CD4+ T cells. As precision vaccine design advances, antigen processing understanding increasingly guides immunogen engineering strategies.