The function of ENSG00000165338 (HECTD2, HECT domain E3 ubiquitin protein ligase 2) is as follows. E3 ubiquitin-protein ligase which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. . (Microbial infection) Catalyzes ubiquitination of Botulinum neurotoxin A light chain (LC) of C.botulinum neurotoxin type A (BoNT/A). .