S strains. cerevisiae able to grow in media with melibiose, stachyose and raffinose.

摘要

The invention relates to strains of S. cerevisiae capable of secreting ±-galactosidase into culture medium, as well as to methods for obtaining ±-galactosidase using said strains and methods for producing biomass and bioethanol by means of culturing said strains in media rich in galactose. In another aspect, the invention provides methods for expressing recombinant proteins using a composition rich in galactose as a culture medium for the microorganisms producing said protein.