Pseudomonas Putida Strain Expressing Benzalacetone Reductase
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Solution Overview
Problem
Existing microorganisms like E. coli and S. cerevisiae are poorly tolerant to phenylpropanoid compounds, leading to low yields and unsuitability for large-scale production of phenylbutanones, particularly frambinone and zingerone, due to the lack of characterized enzymes capable of catalyzing the final reduction step.
Innovation Solution
Development of a genetically modified Pseudomonas putida strain expressing recombinant benzalacetone reductases, such as NADPH-dependent enzymes from Arabidopsis thaliana and Pseudomonas putida, to efficiently convert phenylbuten-2-one into phenylbutanones like frambinone and zingerone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If E. coli or S. cerevisiae are used for frambinone production, then the biosynthetic pathway can be reconstituted, but the yield is low due to poor tolerance to phenylpropanoid compounds
Solution Approach 1:
The patent changes the host microorganism from E. coli or S. cerevisiae to Pseudomonas putida, which has inherently better tolerance to phenylpropanoid compounds. This parameter change (host organism selection) resolves the contradiction by providing both the capability to reconstitute the biosynthetic pathway and the tolerance needed for high-yield production.
2Productivity
If the final reduction step is catalyzed by endogenous enzymes in E. coli or S. cerevisiae, then the biosynthesis can proceed, but the conversion is incomplete and yield remains low
Solution Approach 1:
The patent extracts the limiting factor (endogenous enzyme activity) and replaces it with a heterologous benzalacetone reductase gene from P. putida that has high activity for the final reduction step. This takes out the insufficient endogenous capability and substitutes it with a superior external enzyme source.
Solution Approach 2:
The benzalacetone reductase from P. putida serves multiple functions: it catalyzes the final reduction step efficiently, and its expression in P. putida simultaneously provides both the enzymatic activity and the host tolerance needed for high-yield production.
3Reliability
If natural frambinone is extracted from raspberries, then the authentic compound is obtained, but the availability is limited due to low natural content
Solution Approach 1:
The patent replaces the mechanical/biological extraction process from raspberries with a biotechnological production system using genetically modified P. putida. This substitution transforms the source of frambinone from a limited natural extract to a scalable microbial production system.
Solution Approach 2:
The patent changes the production system parameter from natural extraction to heterologous gene expression in a tolerant host, enabling high-yield production while maintaining the authenticity of the frambinone compound.
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 modified Pseudomonas putida strain achieves higher yields of phenylbutanones, with frambinone production reaching up to 6 times that of wild-type strains, suitable for large-scale production.
Implementation Method 1
This final step involves a reduction of the double bond of α-β unsaturated ketone to a ketone, which may be catalyzed by an enzyme belonging to the oxidoreductase family, NADPH dehydrogenase (EC 1.6.99.1) specifically named benzalacetone reductase or BAR.
Implementation Method 2
The final step is the reduction of 4-hydroxybenzalacetone to frambinone by a benzalacetone reductase.
Data Source
AI summary
The present invention relates to the field involved in the production of phenylbutanone or phenylbutanone derivative compounds, such as frambinone or zingerone, and in particular strains genetically modified to express a benzalacetone reductase.