PSMB10 also known as MECL-1 is a multicatalytic proteinase complex with a highly ordered ring-shaped 20S core structure. PSMB10 plays a crucial role in forming immunoproteasomes, which are essential for efficient antigen processing and presentation via major histocompatibility complex (MHC) class I molecules. Upon stimulation with interferon-gamma, standard 20S proteasome subunits are replaced by inducible subunits, including PSMB10, leading to the generation of peptide ligands vital for immune response. PSMB10 presence in immunoproteasomes enhances protein cleavage specificity, allowing for the production of peptides more effectively presented to T cells, thereby influencing adaptive immunity. PSMB10′s ability to form distinct proteasome complexes, along with other subunits like LMP2 and LMP7, results in a diverse array of proteasome subsets that can tailor immune response to various.