E3 ubiquitin-protein ligase. Mediates monoubiquitination at multiple sites of TSG101 in the presence of UBE2D1, but not of UBE2G1, nor UBE2H. Plays a role in the regulation of endosome-to-lysosome trafficking. Impairs MC1R- and MC4R-signaling by competing with GNAS-binding to MCRs and inhibiting agonist-induced cAMP production. Does not inhibit ADRB2-signaling. Does not promote MC1R ubiquitination.
Protein modification; protein ubiquitination.
Contains 1 RING-type zinc finger.
The RING finger is required for ubiquitin ligase activity.
Autoubiquitinated in vitro.
Cytoplasm > cytosol. Cell membrane; Early endosome. The endosomal localization is dependent on the interaction with TSG101 and Cytoplasm > cytosol. Nucleus. Translocation from the cytosol to the nucleus is seen only in the presence of MC1R and MC4R, but not TBXA2R. Excluded from nucleoli.