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MHC class I molecules present peptides derived from intracellular proteins, enabling immune surveillance by CD8 + T cells and the elimination of virus-infected and cancerous cells. It has been argued that the dominant source of MHC class I-presented peptides is through proteasomal degradation of newly synthesized defective proteins, termed defective ribosomal products (DRiPs). Here, we critically...
Three different proteolytic processes have been shown to be important in the generation of antigenic peptides displayed on MHC-class I molecules. The great majority of these peoptides are derived from oligopeptides produced during the degradation of intracellular proteins by the ubiquitin-proteasome pathway. Novel methods were developed to follow this process in vitro. When pure 26S proteasomes degrade...
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