Abstract
The ‘RING‐between‐RING’‐type E3 ubiquitin ligase HOIP acts via a novel RING/HECT‐hybrid ubiquitin transfer mechanism and catalyses the formation of linear ubiquitin chains by non‐covalently binding the acceptor ubiquitin. But in the absence of a binding partner, HOIP is auto‐inhibited. This explains why assembly of either HOIP/HOIL‐1L or HOIP/SHARPIN is required to catalyse linear chain formation.
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