Enhanced dihydroxy-acid dehydratase activity in lactic acid bacteria
First Claim
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1. A recombinant lactic acid bacterial cell comprising at least one gene encoding a heterologous polypeptide having dihydroxy-acid dehydratase activity and at least about 95% sequence identity to the polypeptide encoded by the polynucleotide sequence of SEQ ID NO:
- 167 or SEQ ID NO;
564 wherein the bacterial cell is substantially free of lactate dehydrogenase activity and wherein the heterologous polypeptide having dihydroxy-acid dehydratase activity has a specific activity of at least about 0.1 μ
mol min−
1 mg−
1 total soluble protein in a crude cell extract.
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Abstract
Lactic acid bacterial (LAB) cells were modified such that they have a specific activity of dihydroxy-acid dehydratase enzyme activity that is increased to about 0.1 μmol min−1 mg−1. LAB cells with even higher activities of 0.2 to 0.6 μmol min−1 mg−1 of DHAD activity were obtained.
These modified cells may be used to produce isobutanol when additional isobutanol biosynthetic pathway enzymes are expressed.
47 Citations
21 Claims
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1. A recombinant lactic acid bacterial cell comprising at least one gene encoding a heterologous polypeptide having dihydroxy-acid dehydratase activity and at least about 95% sequence identity to the polypeptide encoded by the polynucleotide sequence of SEQ ID NO:
- 167 or SEQ ID NO;
564 wherein the bacterial cell is substantially free of lactate dehydrogenase activity and wherein the heterologous polypeptide having dihydroxy-acid dehydratase activity has a specific activity of at least about 0.1 μ
mol min−
1 mg−
1 total soluble protein in a crude cell extract. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- 167 or SEQ ID NO;
Specification