The RING protein RBX-1 is implicated in both NEDDylation and ubiquitylation reactions. In this issue, new structural analysis reveals how conformational flexibility of the RBX-1 linker allows for a marked reorientation of the CUL1–RBX1 complex to facilitate transfer of NEDD8 or ubiquitin by closing the gap between the E2 catalytic site and the substrate.
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Rahighi, S., Dikic, I. Conformational flexibility and rotation of the RING domain in activation of cullin–RING ligases. Nat Struct Mol Biol 18, 863–865 (2011). https://doi.org/10.1038/nsmb.2117
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DOI: https://doi.org/10.1038/nsmb.2117