GDP-fucose protein O-fucosyltransferase 1 precursor (EC 2.4.1.221) (Peptide-O-fucosyltransferase 1) (O-FucT-1); Catalyzes the reaction that attaches fucose through an O-glycosidic linkage to a conserved serine or threonine residue in EGF domains. Plays a crucial role in Notch signaling (388 aa)