Proteasome Endopeptidase ComplexProteolysisUbiquitinAmino AcidsUbiquitin-Protein LigasesUbiquitinsUbiquitinationCysteine EndopeptidasesSequence Homology, Amino AcidProteinsMuscle ProteinsMultienzyme ComplexesMethylhistidinesMolecular Sequence DataEndoplasmic Reticulum-Associated DegradationProteasome InhibitorsPeptide HydrolasesLeucineAmino Acid SequenceMutationLeupeptinsSKP Cullin F-Box Protein LigasesCell LineKineticsAutophagyProtein BindingMuscular AtrophyProtein Processing, Post-TranslationalEndopeptidasesEndoplasmic ReticulumCloning, MolecularCysteine Proteinase InhibitorsHydrolysisAmino Acid SubstitutionBiodegradation, EnvironmentalF-Box ProteinsProtease InhibitorsProtein StabilityLysosomesProtein Structure, TertiarySaccharomyces cerevisiaeEndopeptidase ClpRNA, MessengerBase SequenceSignal TransductionCells, CulturedProtein BiosynthesisUbiquitin-Conjugating EnzymesPolyubiquitinSubstrate SpecificityAdenosine TriphosphatasesLigasesAmino Acid MotifsEscherichia coliSaccharomyces cerevisiae ProteinsModels, BiologicalCarrier ProteinsUbiquitinated ProteinsProtein TransportSequence AlignmentRecombinant ProteinsCullin ProteinsBinding SitesRecombinant Fusion ProteinsATP-Dependent ProteasesMolecular ChaperonesCalpainTime FactorsPhosphorylationBacterial ProteinsPeptidesProtein FoldingCell Cycle ProteinsElectrophoresis, Polyacrylamide GelMuscle, SkeletalGene Expression RegulationHeLa CellsMembrane ProteinsPeptide FragmentsCycloheximideCattleNitrogenFungal ProteinsLiverUbiquitin-Protein Ligase ComplexesLysineCell Line, TumorTranscription, GeneticCachexiaImmunoblottingModels, MolecularMutagenesis, Site-DirectedBlotting, WesternMolecular WeightProtein Degradation End ProductsTranscription FactorsMusclesDown-RegulationHEK293 CellsCathepsins