Engineered Microorganism for Alkane Production via Enzymatic Pathway
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Solution Overview
Problem
Current methods for microbial production of hydrocarbons, particularly alkanes, are limited by insufficient understanding of genes and enzymes involved in metabolic flux, leading to low productivity and inefficiencies in optimizing hydrocarbon production processes.
Innovation Solution
A microorganism variant of E.coli is engineered by introducing specific genes encoding enzymes that convert fatty acyl-CoA to fatty aldehyde and further to alkane, along with promoter substitutions to enhance metabolic pathways, enabling the production of alkanes such as pentadecane, heptadecane, octane, nonane, and nonene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microbial production methods are used to produce hydrocarbons, then environmental benefits and alternative fuel supply are achieved, but productivity is limited due to insufficient understanding of genes and enzymes
Solution Approach 1:
The patent introduces intermediary enzymes (thioesterase, acyl-CoA synthetase, fatty acyl-CoA reductase, fatty aldehyde decarbonylase) that mediate the conversion of fatty acids to alkanes. These enzymes serve as biological catalysts that bridge the gap between existing microbial metabolic pathways and the desired hydrocarbon production, enabling the transformation without requiring complete understanding of all underlying genetic mechanisms.
Solution Approach 2:
The patent modifies metabolic parameters by introducing specific genes and enzymes that change the flux through the fatty acid metabolism pathway. By altering enzyme activities and introducing new metabolic routes, the system transforms the microbial metabolism to favor alkane production, effectively changing the biochemical parameters to achieve higher productivity despite limited initial knowledge.
2Productivity
If existing microbial strains are used for hydrocarbon production, then production process is simpler, but productivity remains low due to lack of optimized metabolic pathways
Solution Approach 1:
The patent segments the hydrocarbon production process into distinct enzymatic steps, each catalyzed by a specific introduced enzyme. The pathway is divided into: (1) thioesterase converting fatty acyl-ACP to free fatty acid, (2) acyl-CoA synthetase converting free fatty acid to fatty acyl-CoA, (3) fatty acyl-CoA reductase converting fatty acyl-CoA to fatty aldehyde, and (4) fatty aldehyde decarbonylase converting fatty aldehyde to alkane. This segmentation allows for targeted optimization of each step while maintaining overall pathway functionality.
Solution Approach 2:
The patent performs preliminary genetic engineering by introducing and expressing the necessary genes for the hydrocarbon pathway before actual production. The microbial strain is pre-modified with the complete set of required enzymes, and the metabolic pathway is established in advance, allowing the organism to naturally produce hydrocarbons when provided with appropriate substrates, thus simplifying the overall production process.
3Productivity
If genes and enzymes are introduced to enhance metabolic pathways, then hydrocarbon production ability is improved, but metabolic pathway complexity increases
Solution Approach 1:
The introduced enzymes are selected to work within the existing microbial metabolic framework, utilizing common substrates and cofactors already present in the host organism. The pathway integrates with the native fatty acid metabolism, allowing the microorganism to use its existing metabolic machinery to support the new hydrocarbon production route, thereby reducing the overall system complexity despite adding new functional capabilities.
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 microorganism variant successfully produces gasoline-range alkanes, increasing hydrocarbon productivity and overcoming previous limitations in metabolic engineering and gene analysis for microbial alkane production.
Implementation Method 1
introducing a gene encoding an enzyme converting fatty acyl-acp to free fatty acid, a gene encoding an enzyme converting free fatty acid to fatty acyl-CoA, a gene encoding an enzyme converting fatty acyl-CoA to fatty aldehyde, and a gene encoding an enzyme converting fatty aldehyde to alkane
Data Source
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AI summary
The present invention relates to a microorganism variant having the ability to produce hydrocarbons, including alkane, and a method of producing hydrocarbons, including alkane, using the same, and more particularly, to a microorganism variant obtained by introducing a gene encoding an enzyme converting fatty acyl-acp to free fatty acid, a gene encoding an enzyme converting free fatty acid to fatty acyl-CoA, a gene encoding an enzyme converting fatty acyl-CoA to fatty aldehyde and a gene encoding an enzyme converting fatty aldehyde to alkane into a microorganism improved so as to be suitable for the production of hydrocarbons, including alkane, and a method of producing hydrocarbons, including alkane, using the same. The microorganism variant of the present invention has high potential to be used to improve strains by additional metabolic flux engineering, and thus is useful for the industrial production of hydrocarbons, including alkane.