Modified yeast consuming l-arabinose

A method for producing an L-arabinose utilizing Saccharomyces cerevisiae yeast strain for the production of ethanol, wherein a Saccharomyces cerevisiae CEN.PK strain is modified by introducing and expressing a B. subtilis araA gene (L-arabinose isomerase), an E. coli araB gene (L-ribulokinase) and an araD gene (L-ribulose-5-P 4-epimerase), and carrying additional mutations in its genome or overexpressing a TAL1 (transaldolase) gene, enabling it to consume L-arabinose, and to produce ethanol thereby from a medium comprising L-arabinose, whereby the araB gene is placed behind a weak promoter and the yeast strain is further modified by overexpressing the yeast GAL2 gene, and whereby the yeast strain is further modified by expressing a mutant form of the E. coli L-ribulokinase enzyme with reduced activity.