Butanol tolerance in microorganisms
First Claim
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1. A recombinant yeast microorganism comprising a pyruvate utilizing biosynthetic pathway, wherein the pyruvate utilizing biosynthetic pathway is an isobutanol biosynthetic pathway comprising heterologous DNA molecules encoding polypeptides that catalyze the following substrate to product conversions:
- a) pyruvate to acetolactate;
b) acetolactate to 2,3-dihydroxyisovalerate;
c) 2,3-dihydroxyisovalerate to α
-ketoisovalerate;
d) α
-ketoisovalerate to isobutyraldehyde; and
e) isobutyraldehyde to isobutanol; and
wherein the recombinant yeast microorganism further comprises a first genetic modification, wherein the first genetic modification is a deletion or disruption in at least one endogenous gene encoding a pyruvate decarboxylase enzyme, wherein the deletion or disruption eliminates pyruvate decarboxylase activity, andwherein the recombinant yeast microorganism further comprises a second genetic modification, wherein the second genetic modification is a substitution mutation in an adenylate cyclase gene, wherein the substitution mutation is at a residue equivalent to A1814 or H1873 of SEQ ID NO;
1 and wherein the adenylate cyclase gene encodes a polypeptide having at least 90% sequence identity to SEQ ID NO;
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Abstract
Provided herein are recombinant yeast host cells and methods for their use for production of fermentation products from a pyruvate utilizing pathway. Yeast host cells provided herein comprise reduced pyruvate decarboxylase activity and modified adenylate cyclase activity. In embodiments, yeast host cells provided herein comprise resistance to butanol and increased biomass production.
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Citations
12 Claims
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1. A recombinant yeast microorganism comprising a pyruvate utilizing biosynthetic pathway, wherein the pyruvate utilizing biosynthetic pathway is an isobutanol biosynthetic pathway comprising heterologous DNA molecules encoding polypeptides that catalyze the following substrate to product conversions:
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a) pyruvate to acetolactate; b) acetolactate to 2,3-dihydroxyisovalerate; c) 2,3-dihydroxyisovalerate to α
-ketoisovalerate;d) α
-ketoisovalerate to isobutyraldehyde; ande) isobutyraldehyde to isobutanol; and wherein the recombinant yeast microorganism further comprises a first genetic modification, wherein the first genetic modification is a deletion or disruption in at least one endogenous gene encoding a pyruvate decarboxylase enzyme, wherein the deletion or disruption eliminates pyruvate decarboxylase activity, and wherein the recombinant yeast microorganism further comprises a second genetic modification, wherein the second genetic modification is a substitution mutation in an adenylate cyclase gene, wherein the substitution mutation is at a residue equivalent to A1814 or H1873 of SEQ ID NO;
1 and wherein the adenylate cyclase gene encodes a polypeptide having at least 90% sequence identity to SEQ ID NO;
1.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification