Engineered Microbial Pathways for 1,4-Butanediol Production
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Solution Overview
Problem
Current methods for producing 1,4-butanediol and its precursors are energy- and capital-intensive, relying on petroleum-based feedstocks, and alternative biologically-produced intermediates like succinic acid are costly and require high temperatures and pressures.
Innovation Solution
Design and production of microbial organisms with engineered biosynthetic pathways for 4-hydroxybutanoic acid, 4-hydroxybutanal, 4-hydroxybutyryl-CoA, and putrescine production, using nucleic acids encoding specific enzymes to express these pathways in organisms like E. coli, optimizing their expression for efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If petroleum-based feedstocks (acetylene, maleic anhydride, propylene oxide) are used for 1,4-butanediol production, then production capacity and established industrial processes are maintained, but energy consumption and capital investment are high
Solution Approach 1:
The patent replaces conventional petrochemical mechanical/thermal processes with biological enzymatic processes. Microorganisms equipped with engineered metabolic pathways convert renewable feedstocks (glucose, starch, cellulose) to 1,4-butanediol through biological metabolism, substituting high-energy chemical synthesis and catalytic hydrogenation with lower-energy biological conversion
Solution Approach 2:
The patent changes the fundamental parameters of the production system by shifting from petroleum-based feedstocks to renewable biomass feedstocks, and from high-temperature/pressure chemical processes to ambient-temperature biological processes. This parameter change enables reduced energy consumption while maintaining productivity
2Adaptability or versatility
If succinic acid is produced biologically as an intermediate, then renewable feedstock substitution is achieved, but isolation and purification costs are high and high temperatures and pressures are required for catalytic reduction
Solution Approach 1:
The patent extracts the problematic intermediate step (succinic acid isolation and purification) from the overall process by engineering microorganisms to directly produce 1,4-butanediol through a complete metabolic pathway. This eliminates the need for separate purification and high-energy reduction steps, achieving renewable feedstock substitution while simplifying manufacturing
Solution Approach 2:
The patent uses engineered microorganisms as living intermediaries that perform the complete conversion from renewable feedstocks to 1,4-butanediol in a single integrated biological system, replacing the multi-step chemical process involving succinic acid isolation, purification, and high-energy catalytic reduction
3Reliability
If conventional petrochemical processes are used, then established industrial infrastructure is utilized, but the process is capital-intensive
Solution Approach 1:
The patent replaces capital-intensive petrochemical infrastructure with biological manufacturing systems. Microorganisms serve as biocatalysts in fermentation processes that can be conducted in simple bioreactors using renewable feedstocks, eliminating the need for expensive petroleum refining and high-energy chemical processing infrastructure
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
Facilitates the production of 1,4-butanediol and its precursors using renewable feedstocks, reducing energy and capital requirements, and enhancing production yields through adaptive evolution and optimized metabolic designs.
Implementation Method 1
The invention provides non-naturally occurring microbial organisms containing a 1,4-butanediol (BDO), 4-hydroxybutanal (4-HBal), 4-hydroxybutyryl-CoA (4-HBCoA) and/or putrescine pathway comprising at least one exogenous nucleic acid encoding a BDO, 4-HBal and/or putrescine pathway enzyme
Data Source
AI summary
The invention provides non-naturally occurring microbial organisms comprising a 1,4-butanediol (BDO), 4-hydroxybutyryl-CoA, 4-hydroxybutanal or putrescine pathway comprising at least one exogenous nucleic acid encoding a BDO, 4-hydroxybutyryl-CoA, 4-hydroxybutanal or putrescine pathway enzyme expressed in a sufficient amount to produce BDO, 4-hydroxybutyryl-CoA, 4-hydroxybutanal or putrescine and further optimized for expression of BDO. The invention additionally provides methods of using such microbial organisms to produce BDO, 4-hydroxybutyryl-CoA, 4-hydroxybutanal or putrescine.