Engineered Imine Reductases for One-Step Chiral Amine Synthesis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for efficient biocatalytic routes to synthesize chiral secondary and tertiary amines under industrially applicable conditions, as existing methods are inefficient and require multi-step chemical processes or chiral boron reagents.
Innovation Solution
Engineered polypeptides with imine reductase activity, derived from directed evolution of opine dehydrogenases, are used to catalyze the conversion of unactivated ketones and amines to form secondary or tertiary amines, exhibiting stereoselectivity and compatibility with industrial conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing chemical methods using chiral boron reagents or multi-step synthesis are used, then chiral secondary and tertiary amines can be produced, but the process efficiency is low and the synthesis requires multiple steps
Solution Approach 1:
The patent extracts the amine synthesis function from complex multi-step chemical processes and isolates it into a single enzymatic reaction step. The engineered imine reductase enzyme catalyzes the direct conversion of ketones and amines to chiral secondary and tertiary amines in one step, eliminating the need for multiple chemical transformations and purification operations required by conventional methods.
Solution Approach 2:
The patent replaces conventional chemical reagents and multi-step synthetic procedures with a biological catalytic system. The engineered imine reductase enzyme uses enzymatic catalysis instead of chemical reagents, enabling the transformation to proceed under milder conditions with higher efficiency and fewer steps, thereby resolving the contradiction between process efficiency and synthesis complexity.
2Manufacturing precision
If conventional chemical methods are used, then chiral amines can be synthesized, but the methods require chiral boron reagents which increase cost and complexity
Solution Approach 1:
The patent employs a reusable enzyme catalyst that can be recovered and reused multiple times, replacing expensive chiral boron reagents. The engineered imine reductase enzyme, being biodegradable and recyclable, provides cost-effective chirality control without requiring expensive stoichiometric chiral reagents, thus resolving the contradiction between manufacturing precision and ease of manufacture.
Solution Approach 2:
The patent changes the fundamental parameter of catalysis from chemical reagents to biological enzymes. The engineered imine reductase enzyme provides superior chirality control through its chiral active site, while the enzymatic nature of the catalyst enables milder reaction conditions and lower costs compared to conventional chiral boron reagent methods.
3Productivity
If biocatalytic routes are developed using whole cells, then some imine reductase activity is achieved, but the reaction conditions are not suitable for industrial application
Solution Approach 1:
The patent extracts the imine reductase activity from whole cell systems and isolates it into purified, engineered enzyme proteins. This allows the enzyme to be used in industrial processes where cell-free systems provide better control over reaction conditions, easier product recovery, and scalability, while maintaining high reaction rates through enzyme optimization.
Solution Approach 2:
The patent changes the form of the biocatalyst from whole cells to purified enzyme proteins, and further optimizes the enzyme through directed evolution. This parameter change enables the enzyme to operate under industrial conditions with improved stability, activity, and ease of process control, while maintaining high productivity through enzymatic catalysis.
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 polypeptides efficiently convert a wide range of substrates to chiral amines, providing a direct and cost-effective biocatalytic route for producing chiral secondary and tertiary amines with high stereoselectivity.
Implementation Method 1
engineered polypeptides having imine reductase activity useful for the conversion of various ketone and amine substrates to secondary and tertiary amine products
Implementation Method 2
The biocatalysts of the invention are capable of catalyzing the conversion of a ketone... and a primary or secondary amine substrate to form a secondary or tertiary amine product compound
Data Source
AI summary
The present application provides engineered polypeptides having imine reductase activity, polynucleotides encoding the engineered imine reductases, host cells capable of expressing the engineered imine reductases, and methods of using these engineered polypeptides with a range of ketone and amine substrate compounds to prepare secondary and tertiary amine product compounds.