Ubiquitin-dependent c-Jun degradation in vivo is mediated by the delta domain - PubMed (original) (raw)
Ubiquitin-dependent c-Jun degradation in vivo is mediated by the delta domain
M Treier et al. Cell. 1994.
Abstract
The role of the ubiquitin-dependent proteolysis system in c-Jun breakdown was investigated. Using in vitro experiments and a novel in vivo assay that utilizes molecularly-tagged ubiquitin and c-Jun proteins, it was shown that c-Jun, but not its transforming counterpart, retroviral v-Jun, can be efficiently multiubiquitinated. Consistently, v-Jun has a longer half-life than c-Jun. Mutagenesis experiments indicate that the reason for the escape of v-Jun from multiubiquitination and its resulting stabilization is the deletion of the delta domain, a stretch of 27 amino acids that is present in c-Jun but not in v-Jun. c-Jun sequences containing the delta domain, when transferred to the bacterial beta-galactosidase protein, function as a cis-acting ubiquitination and degradation signal. The correlation between transforming ability and the escape from ubiquitin-dependent degradation described here suggests a novel route to oncogenesis.
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