Corynebacterium glutamicum Transformant for 2-Phenylethanol Production
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Solution Overview
Problem
Current methods for producing 2-phenylethanol from glucose face challenges due to complex biosynthesis pathways and feedback regulations, as well as the cytotoxicity of 2-phenylethanol, making efficient production difficult.
Innovation Solution
A Corynebacterium glutamicum transformant is created by activating the shikimate pathway and introducing a gene encoding phenylpyruvate decarboxylase activity, allowing for enhanced production of 2-phenylethanol from glucose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phenylalanine is used as a raw material for 2-phenylethanol production, then the production pathway is simpler, but the raw material cost increases significantly
Solution Approach 1:
The patent changes the raw material parameter from phenylalanine to glucose, and modifies the metabolic pathway parameters by introducing heterologous genes (aro10, adh2, aroG) to enable 2-phenylethanol production from glucose through the Ehrlich pathway, thereby resolving the contradiction between pathway complexity and raw material cost
Solution Approach 2:
The patent divides the complex biosynthesis pathway into modular gene components (aro10 for phenylpyruvate decarboxylase, adh2 for alcohol dehydrogenase, aroG for DAHP synthase) that can be independently introduced and optimized in the yeast system, allowing systematic construction of the glucose-to-2-phenylethanol pathway
2Productivity
If 2-phenylethanol production is enhanced in biological systems, then the production efficiency increases, but the cytotoxicity of 2-phenylethanol makes enhanced production more difficult
Solution Approach 1:
The patent selects Kluyveromyces marxianus as the host organism, which naturally possesses higher tolerance to 2-phenylethanol cytotoxicity compared to other yeast species. This allows the system to convert the harmful effect into a beneficial feature by using a host that can withstand high concentrations of the product, thereby enabling enhanced production without being limited by cytotoxicity
Solution Approach 2:
The patent introduces phenylpyruvate decarboxylase (encoded by aro10) as an intermediary enzyme that catalyzes the conversion of phenylpyruvate to phenylacetaldehyde, which is then reduced to 2-phenylethanol. This intermediary step allows for controlled production and accumulation of the product while managing the cytotoxicity effects through the host's inherent tolerance
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 enables efficient production of 2-phenylethanol with high concentrations, overcoming the limitations of previous methods by utilizing a more resistant host bacterium and optimizing the metabolic pathway.
Implementation Method 1
a shikimate pathway is activated
Implementation Method 2
a gene that encodes an enzyme having phenylpyruvate decarboxylase activity is introduced
Implementation Method 3
highly expresses a phenylpyruvate decarboxylase gene (aro10) and an alcohol dehydrogenase gene (adh2)
Data Source
AI summary
Provided is a microorganism that is able to produce 2-phenylethanol at a high concentration, and a method of efficiently producing 2-phenylethanol by using a saccharide as a raw material.Provided is a coryneform bacterium transformant in which a shikimate pathway is activated, and further, a gene that encodes an enzyme having phenylpyruvate decarboxylase activity is introduced in such a manner that the gene can be expressed.Also provided is a 2-phenylethanol producing method that includes causing the coryneform bacterium transformant according to the present disclosure to react in water containing a saccharide.