Chimeric Enone Reductases for Broad-Scope, Stable Hydrogenation
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Solution Overview
Problem
Existing enone reductases exhibit narrow substrate recognition profiles and stability issues that hinder their suitability for commercial applications in industrial processes, particularly in the hydrogenation of nitroalkenes and the stereoselective reduction of α,β-unsaturated carbonyls, esters, and nitriles.
Innovation Solution
Engineering chimeric enone reductase polypeptides with altered amino acid sequences, such as ERED 1, ERED 2, and ERED 3, to enhance thermal and solvent stability, substrate recognition, and stereoselectivity, enabling efficient conversion of α,β unsaturated compounds to their saturated counterparts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wildtype enone reductases are used, then the enzymes can catalyze reduction reactions, but they exhibit narrow substrate recognition profiles and poor stability
Solution Approach 1:
The patent combines functional domains from multiple enone reductase variants (ERED1, ERED2, ERED3) to create chimeric enzymes. By merging complementary regions from different parent enzymes, the chimeric constructs achieve both broad substrate recognition and enhanced stability, resolving the contradiction between versatility and reliability.
Solution Approach 2:
The chimeric enone reductases are constructed as composite molecular entities, combining amino acid sequences from different parental enzymes in specific configurations. This composite approach allows the enzyme to inherit beneficial properties from each parent, achieving both wide substrate scope and improved stability simultaneously.
2Productivity
If existing enone reductases are used for industrial applications, then reduction reactions can be performed, but commercial suitability is limited due to stability issues
Solution Approach 1:
The patent merges stable structural domains from certain enone reductase variants with catalytically active domains from others. The resulting chimeric enzymes maintain high conversion rates while gaining enhanced thermal and solvent stability, making them suitable for industrial processes.
Solution Approach 2:
The patent modifies enzyme parameters through chimeric construction, altering amino acid sequences to optimize both catalytic efficiency and stability. By changing structural parameters while preserving catalytic function, the enzymes achieve improved performance for industrial applications.
3Adaptability or versatility
If enone reductases are engineered for broader substrate recognition, then versatility improves, but enzyme stability may be compromised
Solution Approach 1:
The patent strategically combines substrate-binding regions from enzymes with broad recognition profiles with stable structural cores from other variants. This merging allows the chimeric enzymes to accept diverse substrates while maintaining structural integrity and stability.
Solution Approach 2:
The patent applies local quality changes by modifying specific regions of the enzyme responsible for substrate binding while preserving stable structural domains. This allows enhanced substrate scope in catalytic regions without compromising overall enzyme stability.
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 engineered enone reductases demonstrate improved stability and stereoselectivity, achieving higher conversion rates and diastereomeric excess in reactions like the reduction of α,β unsaturated ketones, aldehydes, and esters, making them suitable for industrial applications.
Implementation Method 1
enone reductases of the Old Yellow Enzyme (OYE) family catalyze a range of reductions of α,β unsaturated ketones, aldehydes, esters, and nitriles
Implementation Method 2
One reaction of interest is the hydrogenation of nitroalkenes
Data Source
AI summary
The disclosure relates to engineered enone reductase polypeptides having improved properties, polynucleotides encoding the engineered polypeptides, related vectors, host cells, and methods for making the engineered enone reductase polypeptides. The disclosure also provides methods of using the engineered enone reductase polypeptides for chemical transformations.