Engineered E. coli for Isopropyl Alcohol Production
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Solution Overview
Problem
Existing isopropyl alcohol-producing bacteria have low productivity and generate significant amounts of butanol and ethanol as by-products, making it difficult to collect isopropyl alcohol due to the complexity of separation processes.
Innovation Solution
An isopropyl alcohol-producing bacterium, Escherichia coli, is engineered with acetoacetate decarboxylase, isopropyl alcohol dehydrogenase, CoA transferase, and thiolase activities, introduced through gene introduction or promoter enhancement, which allows for the production of isopropyl alcohol with minimal by-product formation, enabling simpler purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing isopropyl alcohol-producing bacteria are used, then isopropyl alcohol can be produced from plant-derived materials, but the productivity is low and significant amounts of butanol and ethanol by-products are generated
Solution Approach 1:
The invention extracts and removes the harmful by-product formation pathways by deleting specific genes (adhE, adhF, bdh, ilvA, ilvE, ilvD, ilvC, ilvB, ilvG, ilvH, ilvO, ilvN, ilvM, ilvL, ilvK, ilvJ, ilvI, ilvF, ilvE, ilvD, ilvC, ilvB, ilvA, ilvO, ilvN, ilvM, ilvL, ilvK, ilvJ, ilvI, ilvF) responsible for producing butanol and ethanol, while retaining and enhancing the desired isopropyl alcohol production pathway through strategic gene overexpression
Solution Approach 2:
The invention changes the metabolic parameters of the bacterium by overexpressing specific genes (atoB, atoC, atoD, atoA, adhI) to optimize the flux toward isopropyl alcohol production, thereby increasing productivity and altering the product distribution in favor of the desired compound
2Productivity
If existing bacteria produce butanol and ethanol as by-products, then isopropyl alcohol can be produced, but the separation and purification process becomes complicated requiring multiple distillation steps
Solution Approach 1:
The invention extracts and eliminates the source of the separation problem by deleting the genes responsible for by-product formation, thereby removing the need for complex separation equipment and simplifying the purification process to a single distillation step
Solution Approach 2:
The invention achieves homogeneity in the culture medium by suppressing the formation of different alcohol by-products, resulting in a more uniform composition that requires simpler separation processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The engineered bacterium produces isopropyl alcohol with high purity and reduced by-products, facilitating easier and more efficient collection without the need for complex separation steps, thereby simplifying the industrial production process.
Implementation Method 1
bacteria that utilize plant-derived materials to produce isopropyl alcohol
Implementation Method 2
acetoacetate decarboxylase activity, an isopropyl alcohol dehydrogenase activity, a CoA transferase activity and a thiolase activity
Data Source
Figure 1
AI summary
The invention provides: an isopropyl alcohol-producing bacterium which has an acetoacetate decarboxylase activity, an isopropyl alcohol dehydrogenase activity, a CoA transferase activity and a thiolase activity having been imparted thereto and is capable of producing isopropyl alcohol from a plant-derived material; a method of producing isopropyl alcohol whereby isopropyl alcohol is produced from a plant-derived material by using this isopropyl alcohol-producing bacterium; and an apparatus therefor.