Distinct monoubiquitin signals in receptor endocytosis

Kaisa Haglund, Pier Paolo Di Fiore, Ivan Dikic

Research output: Contribution to journalArticlepeer-review


Numerous cellular proteins are post-translationally modified by the addition of the small modifier protein ubiquitin (Ub). The functional consequences of the type of ubiquitination vary, such that polyubiquitinated proteins are targeted for degradation by the proteasome, whereas monoubiquitination is implicated in other cellular functions, including endocytic trafficking and DNA repair. The monoubiquitination of trafficking cargoes, such as receptors and associated proteins, as well as of endocytic accessory Ub-binding proteins, raises the question of the precise function of monoubiquitin signals in the endocytic route. Recent biochemical and genetic evidence shows that multiple monoubiquitination of epidermal growth factor and platelet-derived growth factor receptors provides trafficking and sorting tags that ensure receptor endocytosis and degradation, whereas monoubiquitination of accessory proteins might play a role in regulating their function as Ub-receptors in the endosome.

Original languageEnglish
Pages (from-to)598-604
Number of pages7
JournalTrends in Biochemical Sciences
Issue number11
Publication statusPublished - Nov 2003

ASJC Scopus subject areas

  • Biochemistry


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