Mammalian cell cycle mutant defective in intracellular protein degradation and ubiquitin-protein conjugation.


Ubiquitin, a 76 residue protein, occurs in eukaryotic cells either free or covalently joined via its carboxyl terminus to epsilon-amino groups of lysine residues in a wide variety of protein species. Previous work has shown that ubiquitin-protein conjugates are preferred substrates in vitro for a non-lysosomal ATP-dependent proteolytic pathway, suggesting… (More)


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