CG9949 MSNKINPKRREPTAAAAGAGATGVATNTSTSTGSSSAGNTSSANTSSSSSSSLSSAGGGDAGMSADLTSLFECPVCFDYVLPPILQCSSGHLVCVSCRSKLTCCPTCRGPLANIRNLAMEKVASNVKFPCKHSGYGCTASLVYTEKTEHEETCECRPYLCPCPGASCKWQGPLDLVMQHLMMSHKSITTLQGEDIVFLATDINLPGAVDWVMMQSCFGHHFMLVLEKQEKYDGHQQFFAIVQLIGSRKEAENFVYRLELNGNRRRLTWEAMPRSIHEGVASAIHNSDCLVFDTSIAQLFADNGNLGINVTISLV SINA_DROME E3 ubiquitin-protein ligase sina 314 E3 ubiquitin-protein ligase that is required for specification of R7 photoreceptor cell fate in the eye by mediating the ubiquitination and subsequent proteasomal degradation of Tramtrack (ttk). E3 Ubiquitin ligases accept ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Acts via the formation of a complex with ebi and phyl that ubiquitinates the transcription repressor ttk, a general inhibitor of photoreceptor differentiation, in a subset of photoreceptor cells in the eye, leading to the differentiation of cells into neurons. Also involved in external sensory organ development. sina Seven in absentia protein