Figure 2.
Tumor necrosis factor (TNF) α and interferon (IFN) γ induce formation of immunoproteasome subunits. LMP7, LMP2 and MECL-1 subunits replace the constitutive catalytic subunits β5, β1 and β2, respectively, which shift the catalytic properties of the proteasome to generate MHC-I-binding peptides.