Addition of multiple ubiquitin moieties to a protein, forming a ubiquitin chain [goid 209] [pmid 17310145] [evidence IDA]; The chemical reactions and pathways resulting in the breakdown of a protein or peptide by hydrolysis of its peptide bonds, initiated by the covalent attachment of a ubiquitin moiety, or multiple ubiquitin moieties, to the protein [goid 6511] [pmid 16168377] [evidence IMP]; The chemical reactions and pathways resulting in the breakdown of a protein or peptide by hydrolysis of its peptide bonds, initiated by the covalent attachment of a ubiquitin moiety, or multiple ubiquitin moieties, to the protein [goid 6511] [pmid 17043353] [evidence IMP]; The chemical reactions and pathways resulting in the breakdown of unfolded or misfolded proteins transported from the endoplasmic reticulum and targeted to cytoplasmic proteasomes for degradation [goid 30433] [pmid 11724934] [evidence IDA]; The chemical reactions and pathways resulting in the breakdown of unfolded or misfolded proteins transported from the endoplasmic reticulum and targeted to cytoplasmic proteasomes for degradation [goid 30433] [pmid 16168377] [evidence IMP]; The series of molecular signals generated as a consequence of the presence of unfolded proteins in the endoplasmic reticulum (ER) or other ER-related stress; results in changes in the regulation of transcription and translation [goid 30968] [pmid 17157811] [evidence IMP]; The process of creating protein oligomers, compounds composed of a small number, usually between three and ten, of component monomers; protein oligomers may be composed of different or identical monomers. Oligomers may be formed by the polymerization of a number of monomers or the depolymerization of a large protein polymer [goid 51259] [pmid 17310145] [evidence IDA]; Any process involved in the controlled movement of a cell [goid 6928] [pmid 1649192] [evidence TAS]; The cascade of processes by which a signal interacts with a receptor, causing a change in the level or activity of a second messenger or other downstream target, and ultimately effecting a change in the functioning of the cell [goid 7165] [pmid 1649192] [evidence TAS]