Long-Chain Fatty Alcohol Production via KAS II and FAR Gene Enhancement
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Solution Overview
Problem
Current methods fail to efficiently produce long-chain fatty alcohols with 20 or more carbon atoms in microorganisms lacking the necessary synthetic pathway, as existing approaches either limit the carbon chain length or do not provide the necessary enzymes for elongation.
Innovation Solution
Enhancing the expression of specific KAS II and FAR genes, such as those from Nannochloropsis and Arabidopsis/Brassica, in host microorganisms like Escherichia coli and cyanobacteria to enable the production of long-chain fatty alcohols by introducing and optimizing the genes for improved enzyme activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only FAR genes are introduced into bacteria lacking long-chain fatty acid synthesis pathway, then fatty alcohol production capability is improved, but the carbon chain length is limited to 18 or less
Solution Approach 1:
The invention divides the fatty alcohol synthesis pathway into two functional segments: (1) long-chain fatty acid synthesis segment using KAS II enzyme to extend carbon chain to 20 or more atoms, and (2) fatty alcohol conversion segment using FAR enzyme. This segmentation allows each enzyme to optimize its function independently, resolving the contradiction between productivity and chain length.
Solution Approach 2:
The KAS II enzyme performs preliminary action by synthesizing long-chain fatty acids (20 or more carbon atoms) before the FAR enzyme acts. This preliminary elongation of the carbon chain enables the subsequent FAR enzyme to produce long-chain fatty alcohols with 20 or more carbon atoms, rather than being limited to 18 or less.
2Adaptability or versatility
If KAS and FAR genes are introduced into host microorganisms, then ability to produce long-chain fatty alcohols is acquired, but device complexity increases
Solution Approach 1:
The KAS II enzyme from Nannochloropsis oculata exhibits universal functionality by accepting various acyl-ACP substrates and catalyzing elongation to produce diverse long-chain fatty acids (C20:0, C20:1, C22:0, C22:1, C24:0). This multi-substrate capability reduces the need for multiple specialized enzymes, simplifying the overall genetic modification strategy while maintaining versatility in product production.
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 microorganisms to produce long-chain fatty alcohols with 20 or more carbon atoms, enhancing productivity and enabling hosts without native ability to synthesize these compounds to acquire the necessary enzymatic capabilities.
Implementation Method 1
a condensation reaction between a long-chain acyl-ACP and malonyl-CoA catalyzed by a 3-ketoacyl-ACP synthase (KAS)
Implementation Method 2
3-ketoacyl-ACP synthase (KAS) is an enzyme involved in elongation of chain length of the acyl group
Implementation Method 3
the acyl-CoA having 20 or more carbon atoms elongated in the endoplasmic reticulum is converted into a long-chain fatty alcohol having 20 or more carbon atoms by a fatty acyl-CoA reductase (hereinafter, referred to as 'FAR')
Data Source
AI summary
A method of producing a long-chain fatty alcohol, containing culturing a microorganism wherein expression of a gene encoding a 3-ketoacyl-ACP synthase and expression of a gene encoding a fatty acyl-CoA reductase are enhanced;a method of providing ability to produce a long-chain fatty alcohol for a microorganism wherein expression of a gene encoding a 3-ketoacyl-ACP synthase and expression of a gene encoding a fatty acyl-CoA reductase are enhanced in a microorganism cell; anda transformant of a microorganism in which expression of a gene encoding a β-ketoacyl-ACP synthase and expression of a gene encoding a fatty acyl-CoA reductase are enhanced.