E3 ubiquitin-protein ligase MGRN1 (Mgrn1)

Mediates TSG101 monoubiquitination at multiple sites. Plays a role in the regulation of endosome-to-lysosome trafficking.

Impairs MC1R- and MC4R-signaling by competing GNAS-binding into MCRs and inhibiting agonist-induced cAMP production. Does not inhibit ADRB2-signaling.