Patent ID: 8389033

Claim:
An isolated industrial Saccharomyces cerevisiae yeast strain comprising one or more point mutations in the MET5 gene or the MET10 gene which results in reduced hydrogen sulfide production when compared to the corresponding industrial yeast strain without the modification, wherein the unmodified yeast strain is Saccharomyces cerevisiae, wherein the one or more point mutations in the MET5 gene result in the following amino acid substitutions in the polypeptide encoded by the MET5 gene: (i) P210L; (ii) A979T; (iii) G980D; (iv) G1115D; (v) E1356K; or (vi) a combination of A979T and G1115D; and wherein the one or more point mutations in the MET10 gene result in the following amino acid substitutions in the polypeptide encoded by the MET10 gene: (i) W59stop; (ii) L606F; (iii) E619K; (iv) W841 stop; (v) G911S; (vi) E929K; (vii) T990I (viii) T997I; or (ix) a combination of W841stop/G911S, E929K, T9901 or L606F and T997I.