Engineered Microorganisms for Short-Chain Hydrocarbon Bioconversion
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Solution Overview
Problem
Current technologies lack efficient methods for converting short-chain hydrocarbons into fuels and chemicals, as existing pathways are primarily designed for medium- and long-chain hydrocarbons, limiting the utilization of abundant short-chain hydrocarbon resources like methane, ethane, propane, and butane.
Innovation Solution
Engineering microorganisms with novel pathways that enable oxygen-independent and oxygen-dependent activation of short-chain hydrocarbons to convert them into acyl-CoA intermediates, which can then be processed through beta-oxidation reversal or fatty acid biosynthesis pathways to produce fuels and chemicals such as carboxylic acids, alcohols, and hydrocarbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing pathways designed for medium- and long-chain hydrocarbons are used, then conversion of those hydrocarbons is efficient, but conversion of short-chain hydrocarbons is limited or impossible
Solution Approach 1:
The patent re-engineers existing hydrocarbon activation pathways to accept both short-chain (C1-C5) and medium/long-chain hydrocarbons, making the pathway universal. The alkane activation module and beta-oxidation pathway are modified to process substrates across the entire hydrocarbon spectrum, allowing a single system to handle diverse chain lengths efficiently
Solution Approach 2:
The invention changes the operational parameters of the metabolic pathway by introducing engineered enzymes with modified substrate specificity. The pathway parameters are adjusted to accommodate shorter chain lengths through enzymatic modifications that enable activation and processing of C1-C5 hydrocarbons that were previously inaccessible
2Adaptability or versatility
If novel pathways are engineered for short-chain hydrocarbon activation, then substrate utilization expands to C1-C5 hydrocarbons, but pathway complexity increases
Solution Approach 1:
The patent segments the hydrocarbon conversion process into distinct functional modules: an alkane activation module that handles C1-C5 substrates, a central metabolism integration module, and a product synthesis module. This segmentation allows each module to be optimized independently while maintaining overall system manageability and reducing the complexity burden of the novel pathway
Solution Approach 2:
The invention uses acyl-CoA intermediates as universal mediators that bridge the novel short-chain hydrocarbon activation pathway with existing central metabolism. These intermediates serve as a common language between the new pathway and native metabolic networks, facilitating integration without requiring complete pathway redesign
3Adaptability or versatility
If oxygen-dependent activation via hydroxyl group addition is used, then activation of short-chain hydrocarbons is achieved, but oxygen consumption increases
Solution Approach 1:
The patent changes the activation mechanism parameter from oxygen-dependent hydroxylation to oxygen-independent fumarate addition. This parameter change fundamentally alters the stoichiometry and energy requirements, eliminating molecular oxygen consumption while maintaining the ability to activate short-chain hydrocarbons through alternative biochemical chemistry
4Use of energy by moving object
If fumarate addition pathway is used for oxygen-independent activation, then oxygen consumption is eliminated, but regeneration of fumarate intermediate is required
Solution Approach 1:
The patent establishes a continuous fumarate regeneration cycle where fumarate consumed in the activation step is continuously regenerated from pathway intermediates. This creates a closed-loop system where the activation cofactor is constantly replenished, maintaining continuous operation without external input and eliminating the need for separate regeneration 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 allows for the efficient conversion of short-chain hydrocarbons into a variety of valuable products, leveraging existing metabolic pathways to generate fuels and chemicals from abundant and less valuable hydrocarbon feedstocks, enhancing the utilization of natural gas resources.
Implementation Method 1
the addition of fumarate to an alkane leading a 2-methyl-alkyl-succinate
Implementation Method 2
the terminal addition of a hydroxyl group to the alkane
Implementation Method 3
conversion of short-chain hydrocarbons (e.g. methane, ethane, propane, butane, pentane) to fuels and chemicals
Implementation Method 4
the fatty acid biosynthesis (FAS) pathway
Data Source
AI summary
An engineered microorganism(s) with novel pathways for the conversion of short-chain hydrocarbons to fuels and chemicals (e.g. carboxylic acids, alcohols, hydrocarbons, and their alpha-, beta-, and omega-functionalized derivatives) is described. Key to this approach is the use of hydrocarbon activation enzymes able to overcome the high stability and low reactivity of hydrocarbon compounds through the cleavage of an inert C—H bond. Oxygen-dependent or oxygen-independent activation enzymes can be exploited for this purpose, which when combined with appropriate pathways for the conversion of activated hydrocarbons to key metabolic intermediates, enables the generation of product precursors that can subsequently be converted to desired compounds through established pathways. These novel engineered microorganism(s) provide a route for the production of fuels and chemicals from short chain hydrocarbons such as methane, ethane, propane, butane, and pentane.