UBE2O is a quality control factor for orphans of multiprotein complexes

Kota Yanagitani, Szymon Juszkiewicz, Ramanujan S. Hegde

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


Many nascent proteins are assembled into multiprotein complexes of defined stoichiometry. Imbalances in the synthesis of individual subunits result in orphans. How orphans are selectively eliminated to maintain protein homeostasis is poorly understood. Here, we found that the conserved ubiquitin-conjugating enzyme UBE2O directly recognized juxtaposed basic and hydrophobic patches on unassembled proteins to mediate ubiquitination without a separate ubiquitin ligase. In reticulocytes, where UBE2O is highly up-regulated, unassembled a-globin molecules that failed to assemble with b-globin were selectively ubiquitinated by UBE2O. In nonreticulocytes, ribosomal proteins that did not engage nuclear import factors were targets for UBE2O. Thus, UBE2O is a self-contained quality control factor that comprises substrate recognition and ubiquitin transfer activities within a single protein to efficiently target orphans of multiprotein complexes for degradation.

Original languageEnglish
Pages (from-to)472-475
Number of pages4
Issue number6350
Publication statusPublished - Aug 4 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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