The second volume in a new series dedicated to protein degradation, this book discusses the mechanism and cellular functions of targeted protein breakdown via the ubiquitin pathway. Backed by the expertise of the world's leading protein degradation experts, this handy reference compiles information on the proteasome-mediated degradation steps of the ubiquitin pathway. In addition to proteasomal function and regulation, latest results on novel members of the ubiquitin superfamily and their role in cellular regulation are presented here. Further volumes in the series cover the function of ubiquitin-protein ligases, and the roles of the ubiquitin pathway in regulating key cellular processes, as well as its pathophysiological disease states. Required reading for molecular biologists, cell biologists and physiologists with an interest in protein degradation.