This volume of Progress in Molecular Biology and Translational Science discusses cutting-edge research of proteasomes and proteasome-associated proteins and cellular systems. The volume is split into two sections. The first part discusses the current knowledge of the structure, function, and regulation of the proteasomal system. The second part describes the role of the proteasome in aging and disease. - Contributions from leading authorities - Informs and updates on all the latest developments in the field