Western blot analysis of UBR2 over-expressed 293 cell line, cotransfected with UBR2 Validated Chimera RNAi ( Cat # H00023304-R01V ) (Lane 2) or non-transfected control (Lane 1). Blot probed with UBR2 monoclonal antibody (M01), clone 4G4 (Cat # H00023304-M01 ). GAPDH ( 36.1 kDa ) used as specificity and loading control.
Proteolysis by the ubiquitin-proteasome system controls the concentration of many regulatory proteins. The selectivity of ubiquitylation is determined by ubiquitin E3 ligases, which recognize the substrate's destabilization signal, or degron. The E3 ligase UBR2 participates in the N-end rule pathway, which targets proteins bearing an N-terminal degron, or N-degron (Kwon et al., 2003 [PubMed 14585983]).[supplied by OMIM