GDP-fucose protein O-fucosyltransferase and related proteins. O-fucosyltransferase-like proteins are GDP-fucose dependent enzymes with similarities to the family 1 glycosyltransferases (GT1). They are soluble ER proteins that may be proteolytically cleaved from a membrane-associated preprotein, and are involved in the O-fucosylation of protein substrates, the core fucosylation of growth factor receptors, and other processes.

Alpha 1,6-fucosyltransferase similar to Bradyrhizobium NodZ. Bradyrhizobium NodZ is an alpha 1,6-fucosyltransferase involved in the biosynthesis of the nodulation factor, a lipo-chitooligosaccharide formed by three-to-six beta-1,4-linked N-acetyl-d-glucosamine (GlcNAc) residues and a fatty acid acyl group attached to the nitrogen atom at the non-reducing end. NodZ transfers L-fucose from the GDP-beta-L-fucose donor to the reducing residue of the chitin oligosaccharide backbone, before the attachment of a fatty acid group. O-fucosyltransferase-like proteins are GDP-fucose dependent enzymes with similarities to the family 1 glycosyltransferases (GT1). They are soluble ER proteins that may be proteolytically cleaved from a membrane-associated preprotein, and are involved in the O-fucosylation of protein substrates, the core fucosylation of growth factor receptors, and other processes.

Alpha 1-6-fucosyltransferase. Alpha 1,6-fucosyltransferase (Fut8) transfers a fucose moiety from GDP-fucose to the reducing terminal N-acetylglucosamine of the core structure of Asn-linked oligosaccharides, in a process termed core fucosylation. Core fucosylation is essential for the function of growth factor receptors. O-fucosyltransferase-like proteins are GDP-fucose dependent enzymes with similarities to the family 1 glycosyltransferases (GT1). They are soluble ER proteins that may be proteolytically cleaved from a membrane-associated preprotein, and are involved in the O-fucosylation of protein substrates, the core fucosylation of growth factor receptors, and other processes.

GDP-fucose protein O-fucosyltransferase 1. The protein O-fucosyltransferase 1 (Ofut1 or O-FucT-1) adds O-fucose to EGF (epidermal growth factor-like) repeats. The O-fucsosylation of the Notch receptor signaling protein is dependent on this enzyme, which requires GDP-fucose as a substrate. O-fucose residues added to the target of O-FucT-1 may be further elongated by other glycosyltransferases. On top of O-fucosylation, O-FucT-1 may have other functions such as the regulation of the Notch receptor exit from the ER. Six highly conserved cysteines are present in O-FucT-1, which is a soluble ER protein, as well as a DXD-like motif (ERD), conserved in mammals, Drosophila, and C. elegans. Both features are characteristic of several glycosyltransferase families. The membrane-bound pre-protein is released by proteolysis and, as for most glycosyltransferases, is strongly activated by manganese. O-FucT-1 is similar to family 1 glycosyltransferases (GT1).