Engineered Microorganism for 1,3-Butanediol Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing 1,3-butanediol are inefficient and require multiple steps, often using difficult-to-synthesize precursors, whereas the proposed solution involves a non-naturally occurring microorganism engineered with specific enzymes to convert acetaldehyde into 1,3-butanediol through a two-step process, utilizing deoxyribose-5-phosphate aldolase and aldo-ketoreductase enzymes.
Innovation Solution
A non-naturally occurring microorganism is engineered to express deoxyribose-5-phosphate aldolase and aldo-ketoreductase enzymes, which catalyze the conversion of acetaldehyde to 3-hydroxybutanal and then to 1,3-butanediol, simplifying the production process and utilizing readily available acetaldehyde as a precursor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional petroleum-based processes are used to produce 1,3-butadiene, then production efficiency is maintained, but environmental sustainability and reliance on non-renewable resources worsen
Solution Approach 1:
The patent replaces conventional petroleum-based chemical processes with a biotechnological route using genetically engineered microorganisms. The engineered microbes express specific enzymes (DERA, AKR, ADH) that catalyze the conversion of acetaldehyde to 1,3-butanediol, substituting biological systems for traditional mechanical/chemical industrial processes and enabling sustainable production from renewable resources
Solution Approach 2:
The patent fundamentally changes the production parameters by using biological catalysts (enzymes) instead of conventional chemical catalysts, operating under mild physiological conditions rather than harsh industrial conditions. This includes using NADPH and NADH as cofactors in the enzymatic reactions, enabling the process to run under environmentally benign conditions while maintaining high productivity
2Adaptability or versatility
If multi-step biosynthetic pathways are used to produce 1,3-butanediol, then product diversity is achieved, but process complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the biosynthetic pathway into three distinct enzymatic steps, each catalyzed by a specific enzyme: (1) DERA catalyzes condensation of two acetaldehydes to produce 3-hydroxybutanal, (2) AKR reduces 3-hydroxybutanal to 1,3-BDO, and (3) ADH provides additional reduction capability. This segmentation allows for modular optimization and independent characterization of each enzymatic step while maintaining overall pathway efficiency
Solution Approach 2:
The patent employs enzymes with broad substrate specificity and versatility. The DERA enzyme can condense various aldehydes, the AKR and ADH enzymes can reduce multiple substrates, and the pathway can produce both 1,3-butanediol and its enantiopure forms. This multi-functionality allows the same enzymatic system to produce different products depending on conditions, reducing the need for entirely separate pathways for different applications
3Manufacturing precision
If difficult-to-synthesize precursors are used in 1,3-butanediol production, then product purity is improved, but manufacturing cost and process difficulty increase
Solution Approach 1:
The patent uses acetaldehyde as a simple, inexpensive, and readily available precursor instead of difficult-to-synthesize compounds. Acetaldehyde can be obtained from fermentation or other inexpensive sources, and the engineered microorganisms efficiently convert it to 1,3-butanediol through the expressed enzymatic pathway, dramatically reducing raw material costs while maintaining high product purity through the specificity of the enzymatic reactions
Solution Approach 2:
The engineered microorganisms perform self-service by containing all necessary enzymatic machinery within the cell. The expressed DERA, AKR, and ADH enzymes work in concert within the microbial host, with the cells providing their own cofactors (NADPH, NADH) and cellular environment, eliminating the need for complex external purification and processing steps that would increase manufacturing difficulty
4Quantity of substance
If enantiopure 1,3-butanediol is produced through conventional methods, then product value is increased, but production cost and process complexity increase
Solution Approach 1:
The patent inverts the conventional approach to enantiopure production. Instead of producing racemic mixtures and then using complex chiral resolution techniques to separate enantiomers, the engineered enzymatic pathway directly produces enantiopure 1,3-butanediol through the stereospecificity of the DERA, AKR, and ADH enzymes. The DERA enzyme creates a specific chiral center, and the subsequent reduction steps maintain that chirality, eliminating the need for costly 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
This approach significantly simplifies the production of 1,3-butanediol, reducing the number of steps and eliminating the need for complex precursors, thereby enhancing efficiency and productivity in biosynthetic processes.
Implementation Method 1
a deoxyribose-5-phosphate aldolase (DERA) comprising an amino acid sequence at least 80% identical to SEQ ID NO: 19, 21, or 22 that catalyzes condensation of two acetaldehydes to produce 3-hydroxybutanal
Implementation Method 2
an aldo-ketoreductase comprising an amino acid sequence at least 70% identical to SEQ ID NO: 25, oxidoreductase, aldehyde reductase or alcohol dehydrogenase that reduces 3-hydroxybutanal to 1,3-BDO
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A non-naturally occurring microorganism having a 1,3-BDO pathway is provided. The microorganism expresses at least one of the following 1,3-BDO pathway enzymes: an aldolase that catalyzes condensation of two acetaldehydes to produce 3-hydroxybutanal; and an aldo- ketoreductase, oxidoreductase, aldehyde reductase or alcohol dehydrogenase that reduces 3- hydroxybutanal to 1,3-BDO. The organism may further express one or more enzymes for producing acetaldehyde. A biosynthetic process involves condensing two acetaldehyde molecules to 3-hydroxybutanal using an enzyme from class aldolases; and selectively reducing 3-hydroxybutanal to 1,3-BDO using an enzyme belonging to the class aldo-ketoreductase, oxidoreductase, aldehyde reductase or alcohol dehydrogenase. The process can further include producing acetaldehyde by a biosynthetic method.