Journal
CURRENT BIOLOGY
Volume 14, Issue 18, Pages R787-R796Publisher
CELL PRESS
DOI: 10.1016/j.cub.2004.09.020
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Regulated protein degradation has emerged as a key recurring theme in multiple aspects of cell-cycle regulation. Importantly, the irreversible nature of proteolysis makes it an invaluable complement to the intrinsically reversible regulation through phosphorylation and other post-translational modifications. Consequently, ubiquitin-protein ligases, the protagonists of regulated protein destruction, have gained prominence that compares to that of the cyclin-dependent kinases (Cdks) in driving the eukaryotic cell-cycle clock. This review will focus on the two main players, the related ubiquitin-protein ligases APC/C and SCF, and how they control cellcycle progression. I will also try to delineate the regulation and interplay of these destruction mechanisms, which are intricately connected to the kinase network as well as to extrinsic signals. Moreover, cell-cycle ubiquitin-protein ligases are themselves subject to proteolytic control in cis as well as in trans. Finally, a careful comparison of the functions and regulation of APC/C and SCF shows that, in certain aspects, their logic of action is fundamentally different.
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