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Yeast with increased butanol tolerance involving a multidrug efflux pump gene

  • US 8,614,085 B2
  • Filed: 02/24/2010
  • Issued: 12/24/2013
  • Est. Priority Date: 02/27/2009
  • Status: Active Grant
First Claim
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1. A recombinant yeast cell comprising:

  • a) an isobutanol biosynthetic pathway, wherein the recombinant yeast cell comprises heterologous genes encoding an acetolactate synthase, an acetohydroxy acid isomeroreductase, an acetohydroxy acid dehydratase, a branched-chain keto acid decarboxylase, and a branched-chain alcohol dehydrogenase that perform the following substrate to product conversions;

    i) pyruvate to acetolactate catalyzed by the acetolactate synthase,ii) acetolactate to 2,3-dihydroxyisovalerate catalyzed by the acetohydroxy acid isomeroreductase,iii) 2,3-dihydroxyisovalerate to α

    -ketoisovalerate catalyzed by the acetohydroxy acid dehydratase,iv) α

    -ketoisovalerate to isobutyraldehyde catalyzed by the branched-chain keto acid decarboxylase,v) isobutyraldehyde to isobutanol catalyzed by the branched-chain alcohol dehydrogenase; and

    b) at least one genetic modification in an endogenous gene encoding a multidrug ATP-binding cassette transporter protein, wherein the multidrug ATP-binding cassette transporter protein has at least 95% sequence identity to SEQ ID NO;

    50, 52, 54, 56, or 58, wherein the at least one genetic modification decreases activity of the endogenous multidrug resistance ATP-binding cassette transporter protein, and;

    wherein the yeast cell has improved tolerance to isobutanol as compared to the corresponding yeast cell that lacks the at least one genetic modification of (b).

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