Valencene Synthase Mutations for Industrial Production
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Solution Overview
Problem
Current valencene synthases have drawbacks such as impaired production rates, low specificity, and significant side product formation, particularly at neutral or alkaline pH, making them unsuitable for industrial valencene production.
Innovation Solution
A novel valencene synthase with a specific amino acid sequence or its functional homologue, which displays improved expression and specificity towards valencene synthesis, reducing side product formation and increasing production rates in host cells like E. coli and Saccharomyces cerevisiae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If known valencene synthases from citrus are used for industrial production, then valencene can be produced, but the production rate is impaired and side product formation is significant
Solution Approach 1:
The patent changes the amino acid sequence parameters of the valencene synthase enzyme by introducing specific mutations (e.g., substituting hydrophobic residues with polar or charged residues in the substrate binding pocket). These parameter changes in the enzyme's molecular structure improve its catalytic efficiency and substrate specificity, thereby increasing valencene production rate while reducing side product formation compared to wild-type citrus valencene synthases
Solution Approach 2:
The patent creates a modified copy of the valencene synthase gene from non-citrus sources (such as conifers) and optimizes it for industrial production. This copied and adapted enzyme retains the core catalytic function but exhibits improved productivity and specificity when expressed in host organisms like E. coli or Saccharomyces cerevisiae, solving the limitations of direct citrus enzyme use
2Productivity
If valencene synthase is expressed in host cells for in vivo production, then continuous valencene synthesis is possible, but expression levels are low and production rates are impaired
Solution Approach 1:
The patent employs host cells (E. coli, Saccharomyces cerevisiae) that possess endogenous farnesyl diphosphate (FPP) biosynthesis pathways. The introduced valencene synthase enzyme utilizes these naturally available FPP substrates without requiring external supplementation, enabling self-sufficient continuous valencene production. The host cell's metabolic machinery serves the foreign enzyme, improving expression reliability and productivity
Solution Approach 2:
The patent separates the valencene synthase gene from its native citrus genomic context and places it under the control of strong, constitutive promoters in expression vectors. This segmentation allows independent optimization of expression levels using host-specific regulatory elements, significantly improving transcription efficiency and protein expression levels compared to native promoter-driven expression
3Quantity of substance
If distillation from citrus essential oils is used to obtain valencene, then valencene can be isolated, but the process is cumbersome due to low valencene concentration
Solution Approach 1:
The patent replaces the mechanical distillation process with a biological production system. Instead of physically separating valencene from citrus essential oils through complex distillation equipment, the invention uses genetically engineered microorganisms to directly synthesize and secrete valencene into the culture medium, where it can be extracted through simpler methods, thereby improving ease of manufacture while increasing effective valencene concentration
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 novel valencene synthase achieves higher valencene production rates and improved specificity compared to existing synthases, with a molar ratio of valencene to germacrene A of 4:1, and demonstrates enhanced activity at neutral or alkaline pH, suitable for industrial applications.
Implementation Method 1
farnesyl diphosphate (FPP) is enzymatically converted into valencene in the presence of a valencene synthase
Data Source
AI summary
The present invention relates to a valencene synthase, to a nucleic acid encoding such valencene synthase, to a host cell comprising said encoding nucleic acid sequence and to a method for preparing valencene, comprising converting farnesyl diphosphate to valencene in the presence of a valencene synthase according to the invention.