Xyrofin Oy

Valtion Teknillinen Tutkimuskeskus

Johan Hallborn

Ulla Airaksinen

Heikki Ojamo

Mats Walfridsson

Merja Elisa Penttila

Sirkka Keranen

Barbel Hahn-Hagerdal

Merja Penttil&auml;

B&auml;rbel Hahn-H&auml;gerdal

Sirkka Ker&auml;nen

Merja Penttilae

Baerel Hahn-Haegerdal

Sirkka Keraenen

This invention relates to recombinant-DNA-technology. Specifically this invention relates to new recombinant yeast strains transformed with xylose reductase and/or xylitol dehydrogenase enzyme genes. A yeast strain transformed with the xylose reductase gene is capable of reducing xylose to xylitol and consequently of producing xylitol in vivo. If both of these genes are transformed into a yeast strain, the resultant strain is capable of producing ethanol on xylose containing medium during fermentation. Further, the said new yeast strains are capable of expressing the said two enzymes. Xylose reductase produced by these strains can be used in an enzymatic process for the production of xylitol in vitro.

Production of ethanol from xylose

This invention relates to recombinant-DNA-technology. Specifically, this invention relates to new recombinant yeast strains transformed with xylose reductase and/or xylitol dehydrogenase enzyme genes. A yeast strain transformed with the xylose reductase gene is capable of reducing xylose to xylitol and consequently of producing xylitol in vivo. If both of these genes are transformed into a yeast strain, the resultant strain is capable of producing ethanol on xylose containing medium during fermentation. Further, the said new yeast strains are capable of expressing the said two enzymes. Xylose reductase produced by these strains can be used in an enzymatic process for the production of xylitol in vitro.

Xylose utilization by recombinant yeasts

Growing community of inventors

Lund, Sweden

Johan Hallborn