A collection of cutting-edge techniques for studying ubiquitin-dependent protein degradation via the proteasome. The topics covered range broadly from basic biochemistry to cellular assays to discovery techniques using mass spectrometric analysis. These biochemical and cellular methods are necessary to explore the ubiquitin-proteasome system and ubiquitin-proteasome-dependent functions. State-of-the-art and user-friendly, Ubiquitin-Proteasome Protocols offers novice and experienced bench scientists alike a thorough compendium of readily reproducible techniques that will accelerate discovery, enhance productivity, and permit manipulation of the system for varied research purposes.