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Structural regulation of cullin-RING ubiquitin ligase complexes Duda DM; Scott DC; Calabrese MF; Zimmerman ES; Zheng N; Schulman BACurr Opin Struct Biol 2011[Apr]; 21 (2): 257-64Cullin-RING ligases (CRLs) compose the largest class of E3 ubiquitin ligases. CRLs are modular, multisubunit enzymes, comprising interchangeable substrate receptors dedicated to particular Cullin-RING catalytic cores. Recent structural studies have revealed numerous ways in which CRL E3 ligase activities are controlled, including multimodal E3 ligase activation by covalent attachment of the ubiquitin-like protein NEDD8, inhibition of CRL assembly/activity by CAND1, and several mechanisms of regulated substrate recruitment. These features highlight the potential for CRL activities to be tuned in responses to diverse cellular cues, and for modulating CRL functions through small-molecule agonists or antagonists. As the second installment of a two-review series, this article focuses on recent structural studies advancing our knowledge of how CRL activities are regulated.|Allosteric Regulation[MESH]|Computer Simulation[MESH]|Cullin Proteins/*chemistry/metabolism[MESH]|Enzyme Inhibitors/metabolism[MESH]|Gene Expression Regulation, Enzymologic[MESH]|Models, Molecular[MESH]|Protein Conformation[MESH]|Substrate Specificity[MESH]|Ubiquitin-Protein Ligases/*chemistry/*metabolism[MESH]|Ubiquitins/metabolism[MESH] |
