Figure 1.
Structure of proteasomes. (A) Assembly of α and β subunits to form the 20S (core) complex of the constitutive protesome. (B) Assembly of the inducible β subunits to form the 20S (core) of the immunoproteasome. (C) 26S proteasome with the 20S core particle and the 19S regulatory complex. (D) 20S (core) immunoproteasome.