Abstract: The invention is directed to an isolated DNA molecule which includes a gene encoding an enzyme protein which has an NADH dependent L-xylulose reductase activity. The DNA sequence encoding the enzyme protein was identified. The invention is further directed to a microorganism transformed with said DNA molecule of the invention, as well as to the NADH dependent L-xylulose reductase. The invention can be utilised for the conversion of biomaterial, e.g.

Abstract: The present invention relates to fungal microorganism having an increased ability to carry out biotechnological process(es). In particular, the invention relates to improving the regeneration of redox cofactors in biotechnological processes where useful products are produced from biomass containing pentoses. According to the invention, the microorganism is transformed with a DNA sequence encoding an NADP linked glyceraldehyde 3-phosphate dehydrogenase. The invention can be used to provide useful products for mankind from biological materials, including e.g. agricultural and forestry products, municipal waste. Examples of such useful products are ethanol, lactic acid, polyhydroxyalkanoates, amino acids, fats, vitamins, nucleotides and a wide variety of enzymes and pharmaceuticals.

Abstract: An isolated DNA molecule includes a gene encoding an enzyme protein which has an NADH dependent L-xylulose reductase activity. The isolated DNA molecular may be included in a vector, and a genetically modified microorganism transformed by such vector. The genetically modified microorganisms are utilized to produce fermentation products.