GDP-fucose protein O-fucosyltransferase, plant specific subfamily. Some members of this plant-specific family of O-fucosyltransferases have been annotated as auxin-independent growth promotors. The function of the protein seems unclear. 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. This is a family of conserved proteins representing the enzyme responsible for adding O-fucose to EGF (epidermal growth factor-like) repeats. Six highly conserved cysteines are present in O-FucT-1 as well as a DXD-like motif (ERD), conserved in mammals, Drosophila, and C. elegans. Both features are characteristic of several glycosyltransferase families. The enzyme is a membrane-bound protein released by proteolysis and, as for most glycosyltransferases, is strongly activated by manganese.