Abstract: An expression vector that includes a polynucleotide having a heterologous regulatory element operably linked to a polynucleotide sequence derived from Solanum tuberosum and encoding a xylosyltransferase capable of glycosylating gentisic acid to produce gentisic acid 5-O-?-D xylopyranoside, a transcription template having such a polynucleotide and adapted for in vitro transcription in a cell-free system, a method for producing gentisic acid 5-O-?-D xylopyranoside by culturing a recombinant host cell containing such an expression vector under conditions in which the cell expresses the xylosyltransferase from the polynucleotide, and a method for producing gentisic acid 5-O-?-D xylopyranoside by contacting a composition including gentisic acid and UDP-xylose with a recombinant xylosyltransferase. The recombinant host cell containing such an expression vector can be a bacterial cell, a plant cell, or a fungal cell, an animal cell, or a multicellular organism such as a plant.

Abstract: Polynucleotides encoding corresponding polypeptides capable of glycosylating steviol at its C-19 position to produce a steviol glycoside, an expression vector including such a polynucleotide, a method for producing a steviol glycoside by culturing a recombinant host cell containing such an expression vector under conditions in which the cell expresses the UDP-glycosyltransferase from the polynucleotide, and a method for producing a steviol glycoside by contacting a composition including steviol with a recombinant UDP-glycosyltransferase. The steviol glycoside can be steviol-19-O-glycoside. The recombinant host cell containing such an expression vector can be a bacterial cell, a plant cell, or a fungal cell, an animal cell, or a multicellular organism such as a plant.

Abstract: An expression vector that includes a polynucleotide having a heterologous regulatory element operably linked to a polynucleotide sequence derived from Solanum tuberosum and encoding a xylosyltransferase capable of glycosylating gentisic acid to produce gentisic acid 5-O-?-D xylopyranoside, a transcription template having such a polynucleotide and adapted for in vitro transcription in a cell-free system, a method for producing gentisic acid 5-O-?-D xylopyranoside by culturing a recombinant host cell containing such an expression vector under conditions in which the cell expresses the xylosyltransferase from the polynucleotide, and a method for producing gentisic acid 5-O-?-D xylopyranoside by contacting a composition including gentisic acid and UDP-xylose with a recombinant xylosyltransferase. The recombinant host cell containing such an expression vector can be a bacterial cell, a plant cell, or a fungal cell, an animal cell, or a multicellular organism such as a plant.

Abstract: Polynucleotides encoding corresponding polypeptides capable of glycosylating steviol at its C-19 position to produce a steviol glycoside, an expression vector including such a polynucleotide, a method for producing a steviol glycoside by culturing a recombinant host cell containing such an expression vector under conditions in which the cell expresses the UDP-glycosyltransferase from the polynucleotide, and a method for producing a steviol glycoside by contacting a composition including steviol with a recombinant UDP-glycosyltransferase. The steviol glycoside can be steviol-19-O-glycoside. The recombinant host cell containing such an expression vector can be a bacterial cell, a plant cell, or a fungal cell, an animal cell, or a multicellular organism such as a plant.