Genetically Modified Microbial Cells for Alkane Conversion
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Solution Overview
Problem
Current methods for producing ω-functionalized carboxylic acid esters face inefficiencies due to reliance on fatty acids from plant and animal oils, which are costly and difficult to obtain, and the use of simple carbon sources like glucose, which increases production costs and complexity.
Innovation Solution
Genetically modified microbial cells are developed to convert alkanes into ω-functionalized carboxylic acid esters, bypassing the need for fatty acids and simple carbon sources, using enzymes like P450 alkane hydroxylases and wax-ester synthases to simplify the conversion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fatty acids from plant and animal oils are used as starting material, then ω-functionalized carboxylic acid esters can be produced, but the production costs increase and raw materials become difficult to obtain
Solution Approach 1:
The patent replaces expensive, scarce fatty acids from plant and animal oils with cheap, readily available alkanes as starting material. Alkanes are abundant petrochemical feedstocks that can be easily obtained, eliminating the supply constraints and high costs associated with natural oil sources while maintaining efficient production of ω-functionalized carboxylic acid esters
Solution Approach 2:
The patent fundamentally changes the starting material parameter from fatty acids to alkanes. This parameter change enables access to a different, more abundant raw material source (petrochemical alkanes versus natural oils) while achieving the same production goal through a different biochemical pathway using genetically modified cells
2Productivity
If simple carbon sources like glucose are used to produce ω-functionalized carboxylic acid esters, then production can proceed, but production costs and process complexity increase
Solution Approach 1:
The patent replaces expensive simple carbon sources like glucose with cheaper alkane substrates. Alkanes are abundant, low-cost petrochemical feedstocks that eliminate the high material costs associated with sugar-based substrates while simplifying the overall production economics
Solution Approach 2:
The patent extracts and eliminates the need for complex genetic modifications required for glucose metabolism. By using alkanes as substrate, the process bypasses the need for engineered sugar uptake and metabolism pathways, thereby reducing process complexity and genetic engineering requirements
3Adaptability or versatility
If genetically modified cells are used to convert alkanes to ω-functionalized carboxylic acid esters, then production flexibility increases and fatty acid dependency is eliminated, but cell development complexity increases
Solution Approach 1:
The genetically modified cells are engineered to perform multiple functions: alkane uptake, alkane activation, and ω-functionalization in a single biological system. This multi-functionality provides production flexibility by eliminating the need for separate processing steps for different substrate types while consolidating the biochemical pathway into one versatile cell type
Solution Approach 2:
The patent introduces genetically modified cells as an intermediary biocatalyst that bridges the gap between alkane substrate and ω-functionalized carboxylic acid ester product. These engineered cells serve as a mediator that enables the transformation while providing flexibility in production conditions and eliminating dependency on fatty acid starting materials
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 method enables high-yield production of ω-functionalized carboxylic acid esters from alkanes with reduced costs and complexity, utilizing readily available petrochemical raw materials and minimizing environmental impact.
Implementation Method 1
using enzymes like P450 alkane hydroxylases and wax-ester synthases to simplify the conversion process
Data Source
AI summary
A microbial cell, which is genetically modified to increase the expression relative to the corresponding genetically unmodified cell of an AlkB alkane hydroxylase (Eb) having an amino acid sequence at least 95% identical with the amino acid sequence of SEQ ID NO: 1 and a wax-ester synthase (Ef) having an amino acid sequence at least 95% identical with the amino acid sequence of SEQ ID NO: 2. The cell does not have a genetic modification that increases formation of a carboxylic acid or a carboxylate ester from a simple carbon source.