The U-box ubiquitin ligase UFD-2 is one of the most abundant components of the ubiquitin proteasome system in muscle cells. Here the authors perform in vitro and in vivo experiments and show that UFD-2 has E3 ligase activity and that it ubiquitinates unfolded myosin using the C. elegans myosin chaperone UNC-45 as an adaptor protein.
- Doris Hellerschmied
- Max Roessler
- Tim Clausen
