Engineered Fusion Protein Biosynthesis of Geraniol
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Solution Overview
Problem
Current methods for producing geraniol and geranyl acetate are limited by low yields due to inadequate solubility and activity of plant geraniol synthases in microbes, and rely on unsustainable chemical synthesis.
Innovation Solution
A host cell comprising vectors encoding genes of the mevalonate pathway and the Nudix pathway, along with an engineered fusion protein, is used to culture in a medium with an inducer and carbon substrate, facilitating the biosynthesis of geraniol and geranyl acetate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plant geraniol synthases are used for biosynthesis in microbes, then natural production route is established, but yield is limited due to inadequate solubility and activity
Solution Approach 1:
The patent combines multiple enzymatic functions into a single fusion protein: diphosphate synthase activity, prenyltransferase activity, and geranyl synthase activity. This fusion protein integrates the mevalonate pathway and Nudix pathway enzymes to produce geraniol and geranyl acetate, overcoming the limitation of using separate plant geraniol synthases that have inadequate solubility and activity in microbial systems.
Solution Approach 2:
The engineered fusion protein performs multiple functions simultaneously: it catalyzes the conversion of acetyl-CoA to isopentenyl pyrophosphate (mevalonate pathway), converts isopentenyl pyrophosphate to geranyl pyrophosphate (prenyltransferase activity), and synthesizes geraniol and geranyl acetate (geranyl synthase activity). This multi-functional enzyme system enables efficient biosynthesis in microbial hosts.
2Productivity
If chemical synthesis is used for geraniol and geranyl acetate production, then high yield is achieved, but environmental sustainability is compromised
Solution Approach 1:
The patent replaces chemical synthesis methods with a biological system based on enzymatic reactions. By expressing the engineered fusion protein in microbial cells, the production process uses biochemical transformations instead of chemical reactions, eliminating the need for harsh chemicals and high-energy conditions, thereby achieving both high yield and environmental sustainability.
Solution Approach 2:
The patent changes the fundamental parameters of the production process from chemical to biological. By using enzymatic catalysis instead of chemical synthesis, the process operates under milder conditions (lower temperature, lower pressure, aqueous environment), using renewable carbon sources and producing biodegradable products, thus achieving sustainable high-yield 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 method significantly increases the yield of geraniol and geranyl acetate, overcoming the limitations of existing technologies and providing a more sustainable and efficient biotechnological route for production.
Implementation Method 1
The mevalonate pathway is the first recognized pathway for biosynthesis of isopentenyl pyrophosphate (IPP) and dimethylallyl pyrophosphate (DMAPP), which involves a series of six enzymatic steps that convert acetyl-CoA to IPP
Implementation Method 2
Nudix hydrolases hydrolyse a wide range of organic pyrophosphates, including nucleoside di- and triphosphates, dinucleoside and diphosphoinositol polyphosphates, nucleotide sugars and RNA caps
Implementation Method 3
a method and system for the biosynthesis of geraniol and geranyl acetate that overcomes, or at least ameliorates, one or more of the disadvantages described above
Data Source
AI summary
The present invention relates to host cells comprising genes of the mevalonate and Nudix pathways, engineered fusion proteins of enzymes of the mevalonate and Nudix pathways, methods as well as kits for producing geraniol and geranyl acetate.