Engineered Enone Reductases for Stable Broad-Substrate Reduction

Solution Overview

Problem

Existing enone reductases exhibit narrow substrate recognition profiles and stability issues that hinder their suitability for commercial applications in the industrial production of compounds like alkaloids, antibiotics, and biocides, as well as chiral building blocks for optically active carotenoids.

Innovation Solution

Engineered enone reductase polypeptides with improved thermal and solvent stability, characterized by specific amino acid residue differences, are developed to enhance substrate recognition and stereoselectivity, enabling efficient conversion of α,β unsaturated compounds to their saturated counterparts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If wildtype enone reductases are used, then the enzyme can catalyze reduction reactions, but the substrate recognition profile is narrow and stability is poor

Engineering Contradiction:

Improvesubstrate recognition profileVSAvoidenzyme stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies local quality by introducing specific amino acid substitutions at key positions (e.g., Y196F mutation) to enhance nitronate accumulation while maintaining catalytic activity. This localized modification approach allows the enzyme to improve substrate recognition for specific substrates without compromising overall stability

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs parameter changes by systematically varying amino acid residues at positions affecting substrate binding and catalysis. Through directed evolution and rational design, specific mutations (e.g., in the active site region) are introduced to broaden substrate recognition profile while selecting for variants that maintain or improve thermal and solvent stability

Inventive Principle:

Principle #35Parameter changes

2Productivity

If enone reductases with broad substrate recognition are developed, then more compounds can be produced, but enzyme stability for commercial applications deteriorates

Engineering Contradiction:

Improveconversion rateVSAvoidcommercial application stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-selecting stable enzyme variants through directed evolution before optimizing for productivity. Stable parent enzymes are first obtained, then subsequent mutations are introduced to enhance conversion rates and substrate scope, ensuring that productivity improvements are built upon a stable foundation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs composite materials by creating chimeric enone reductase proteins that combine domains or regions from different parental enzymes. These chimeric proteins integrate stability-conferring elements from one parent with productivity-enhancing elements from another, achieving both commercial stability and high conversion rates

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If stereoselectivity is enhanced through engineering, then chiral building block quality improves, but enzyme complexity increases

Engineering Contradiction:

ImprovestereoselectivityVSAvoidenzyme structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing specific amino acid substitutions at key positions (e.g., Y196F mutation) to enhance nitronate accumulation while maintaining catalytic activity. This localized modification approach allows the enzyme to improve substrate recognition for specific substrates without compromising overall stability

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs parameter changes by systematically varying amino acid residues at positions affecting substrate binding and catalysis. Through directed evolution and rational design, specific mutations (e.g., in the active site region) are introduced to broaden substrate recognition profile while selecting for variants that maintain or improve thermal and solvent stability

Inventive Principle:

Principle #35Parameter changes

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 enhanced stability and stereoselectivity, achieving higher conversion rates and diastereomeric excess in the production of valuable compounds, such as levodione and nitronates, with improved efficiency and stability under industrial conditions.

Implementation Method 1

Engineered enone reductase polypeptides having altered enzyme properties relative to wildtype enone reductases. These engineered enone reductase polypeptides are capable of reducing an α,β unsaturated compound, such as an α,β unsaturated ketone, aldehyde, ester or nitrile to the corresponding saturated ketone, aldehyde, ester or nitrile.

Methodology Applied

Scientific EffectEnzymatic reduction: Enzyme

Implementation Method 2

One reaction of interest is the hydrogenation of nitroalkenes

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Data Source

PatentUS20260043010A1Enone reductases

Publication Date: 2026.02.12 CODEXIS INC

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.