YEAST STRAINS RESISTANT TO PURINE BASE ANALOGUES, PROCESS FOR THE PRODUCTION THEREOF, YEAST EXTRACTS OBTAINABLE FROM SAID YEAST STRAINS AND USE OF SAID YEAST STRAINS OR YEAST EXTRACTS IN FOOD, DRINK AND BEVERABES

摘要

The present invention describes a process for the preparation of a yeast strain resistant to a purine base analogue comprising: a) subjecting a parent yeast strain to mutagenesis; b) selecting among the yeast strains obtained in a) a yeast strain which is resistant to a purine base analogue; c) selecting among the yeast strains obtained in b) a yeast strain which has a higher intracellular amount of purine-containing ribonucleotide when compared with the parent strain. The yeast strains resistant to a purine base analogue obtainable by the process of the invention accumulate purine-containing ribonucleotides and preferably also pyrimidine-containing ribonucleotides intracellularly and can be advantageously used in the preparation of yeast extracts, in particular of yeast extracts comprising 5'-ribonucleotides.