E3 ubiquitin-protein ligase MARCHF9 (MARCHF9)

E3 ubiquitin-protein ligase that may mediate ubiquitination of MHC-I, CD4 and ICAM1, and promote their subsequent endocytosis and sorting to lysosomes through multivesicular bodies. E3 ubiquitin ligases take ubiquitin from an E2 ubiquitin-conjugating enzyme in the shape of a thioester and then directly transfer the ubiquitin to targeted substrates.

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