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    • 11. 发明申请
    • YEAST CELL CAPABLE OF SIMULTANEOUSLY FERMENTING HEXOSE AND PENTOSE SUGARS
    • WO2019149789A1
    • 2019-08-08
    • PCT/EP2019/052307
    • 2019-01-31
    • DSM IP ASSETS B.V.
    • VAN MARIS, Antonius Jeroen AdriaanPRONK, Jacobus ThomasVERHOEVEN, Maarten DirkPAPAPETRIDIS, Ioannis
    • C12N1/18C12N9/12C12P7/08C12N9/90
    • C12N1/18C12N9/12C12N9/90C12P7/08
    • The invention relates to a method for preparing a yeast which is capable of simultaneously fermenting a pentose and a hexose sugar, said method comprising: (a) providing a yeast which comprises: one or more heterologous genes encoding an enzyme of a pentose metabolic pathway; a disruption of a gene encoding a ribulose-phosphate 3-epimerase and a disruption of a gene encoding a glucose-6-phosphate isomerase; and one or more overexpressed endogenous genes encoding an enzyme of the pentose phosphate pathway; and optionally: a heterologous gene encoding an NADH- dependent 6-phosphogluconate dehydrogenase; and a disruption of one or more genes encoding an NADPH dependent 6-phosphogluconate dehydrogenase, (b) subjecting said yeast to evolutionary engineering on a medium comprising a hexose sugar and at least one pentose sugar, selecting for a yeast with improved growth rate when grown on a media comprising a hexose and at least one pentose sugar, so as to obtain an evolved yeast; and optionally (c) isolating a single cell isolate from said evolved yeast; which method subsequently comprises either (d) restoring, in the (optionally isolated) evolved yeast, one or more of the disrupted genes, or: (d') identifying genetic permutations in at least part of the genome of the optionally isolated evolved yeast by genome sequencing; and (e) constructing an improved pentose and hexose-fermenting yeast comprising one or more of said genetic permutations. The invention also relates to a recombinant yeast comprising one or more heterologous genes of a pentose metabolic pathway, which yeast further comprises a gene encoding a variant of a parent (endogenous) polypeptide, wherein the variant comprises an amino acid sequence which, when aligned with the amino acid sequence set out in SEQ ID NO: 6, comprises at least one mutation. Such yeast can be used in ethanol fermentation with shorter fermentation times.