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Polyubiquitylation is a complex but poorly understood biochemical reaction catalyzed by E3 ubiquitin ligases. In this issue of Cell, Deffenbaugh et al. provide experimental support for a model in which the dynamic release of the ubiquitin-charged E2 Cdc34 from its primary binding site within the rigid cradle-like SCF E3 complex allows for unexpected spatial flexibility to assemble a polyubiquitin...
Cullins (CULs) are subunits of a prominent class of RING ubiquitin ligases. Whereas the subunits and substrates of CUL1-associated SCF complexes and CUL2 ubiquitin ligases are well established, they are largely unknown for other cullin family members. We show here that S. pombe CUL3 (Pcu3p) forms a complex with the RING protein Pip1p and all three BTB/POZ domain proteins encoded in the fission yeast...
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