The mechanism of OTUB1-mediated inhibition of ubiquitination.

OTUB1 is an atypical deubiquitinating enzyme which prevents ubiquitin attachment and is important in the DNA damage pathway; structural analysis of OTUB1 in complex with an E2 ubiquitin-conjugating enzyme reveals that the ability of OTUB1 to inhibit ubiquitin chain synthesis is regulated by an allosteric feedback mechanism.