Recycling system for manipulation of intracellular NADH availability
First Claim
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1. An isolated engineered cell, comprising a recombinant NADH-recycling system having:
- (a) a native cofactor-independent formate dehydrogenase genetically engineered to reduce its enzymatic activity as compared with the activity in a non-engineered cell, and(b) an expression construct comprising an expressible gene encoding a heterologous NAD+-dependent formate dehydrogenase (FDH) that increases the enzymatic activity of NAD+-dependent FDH in the cell as compared with the activity of NAD+-dependent FDH in a non-engineered cell,wherein said FDH converts NAD+ to NADH in the presence of formate.
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Abstract
The present invention describes a novel recombinant NADH recycling system that is used as a process for producing reduced compounds. In a specific embodiment, the reduced compounds include ethanol, succinate, lactate, a vitamin, a pharmaceutical and a biodegraded organic molecule. The NADH recycling system effects metabolic flux of reductive pathways in aerobic and anaerobic environments.
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8 Claims
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1. An isolated engineered cell, comprising a recombinant NADH-recycling system having:
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(a) a native cofactor-independent formate dehydrogenase genetically engineered to reduce its enzymatic activity as compared with the activity in a non-engineered cell, and (b) an expression construct comprising an expressible gene encoding a heterologous NAD+-dependent formate dehydrogenase (FDH) that increases the enzymatic activity of NAD+-dependent FDH in the cell as compared with the activity of NAD+-dependent FDH in a non-engineered cell, wherein said FDH converts NAD+ to NADH in the presence of formate. - View Dependent Claims (2, 3, 4)
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5. An isolated engineered bacterial cell with a recombinant NADH-recycling system comprising:
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(a) a native cofactor-independent formate dehydrogenase that has been inactivated by mutation or deletion, and (b) an expression construct comprising an expressible gene encoding a heterologous NAD+-dependent formate dehydrogenase (FDH) that results in overexpression of the NAD+-dependent FDH as compared with the expression of NAD+-dependent FDH in a non-engineered cell, wherein said FDH converts NAD+ to NADH in the presence of formate. - View Dependent Claims (6, 7)
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8. A bacterial cell comprising an expression vector encoding a heterologous NAD+-dependent formate dehydrogenase (FDH) and lacking cofactor-independent formate dehydrogenase activity, wherein said FDH converts NAD+ to NADH in the presence of formate.
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