Upon stimulation with IFN – γ, the expression of the three catalytic β subunits β1, β2, and β5 with iso-forms β1i (LMP2), β2i (MECL – 1), and β5i (LMP7) are induced, respectively. These subunits are incorporated into the 20S proteasome to form the immune 20S proteasome. It was reported that the immunoproteasome has altered proteolytic activities compared to its normal form, which favor the generation of immunopeptides for antigen presentation.
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