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Two F-box/WD-repeat proteins Pop1 and Pop2 form hetero- and homo-complexes together with cullin-1 in the fission yeast SCF (Skp1-Cullin-1-F-box) ubiquitin ligase.
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Abstract
In the ubiquitin-dependent proteolysis pathway, a ubiquitin ligase (E3) is responsible for substrate selectivity and timing of degradation. A novel E3, SCF (Skp1-Cullin-1/Cdc53-F-box) plays a pivotal role in cell cycle progression. In fission yeast, F-box/WD-repeat protein Pop1 regulates the level of the CDK (cyclin-dependent kinase) inhibitor Rum1 and the S phase regulator Cdc18.