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| RPN13 | Subunit of the 19S regulatory particle of the 26S proteasome lid; acts as a ubiquitin receptor for the proteasome; null mutants accumulate ubiquitinated Gcn4p and display decreased 26S proteasome stability; protein abundance increases in response to DNA replication stress; Belongs to the RPN13 family. (156 aa) | ||||
| PRE1 | Beta 4 subunit of the 20S proteasome; localizes to the nucleus throughout the cell cycle; Belongs to the peptidase T1B family. (198 aa) | ||||
| PUP3 | Beta 3 subunit of the 20S proteasome; involved in ubiquitin-dependent catabolism; human homolog is subunit C10. (205 aa) | ||||
| MAS2 | Alpha subunit of the mitochondrial processing protease (MPP); essential processing enzyme that cleaves the N-terminal targeting sequences from mitochondrially imported proteins. (482 aa) | ||||