Polypeptide Catalyst for High-Substrate Reduction
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Solution Overview
Problem
Enzymatic processes face challenges with substrate inhibition at high concentrations, limiting the scalability of reduction reactions using traditional biocatalysts.
Innovation Solution
A polypeptide catalyst with an amino acid sequence having at least 50% identity to specific sequences (e.g., SEQ ID NO: 1, 7, 9) is used for catalyzing reduction reactions at high substrate concentrations, up to 1500 mM, maintaining high activity and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional biocatalysts are used for reduction reactions, then the reactions can proceed under conventional conditions, but substrate inhibition occurs at high concentrations limiting scalability
Solution Approach 1:
The patent applies parameter changes by modifying the enzyme's amino acid sequence to alter its substrate binding properties and catalytic characteristics. Specific mutations in the active site and substrate binding regions enable the enzyme to maintain high activity at substrate concentrations up to 1500 mM, fundamentally changing the operational parameters of the biocatalyst to eliminate substrate inhibition.
2Productivity
If substrate concentration is increased to improve reaction efficiency, then productivity increases, but enzyme activity is inhibited
Solution Approach 1:
The enzyme's amino acid sequence is modified through specific mutations that change its kinetic parameters, particularly its affinity for substrate and resistance to inhibition. These parameter changes allow the enzyme to operate efficiently at high substrate concentrations without suffering from inhibition, thereby resolving the contradiction between productivity and enzyme activity.
3Ease of manufacture
If high substrate concentrations are used to reduce process volume and improve scalability, then manufacturing efficiency improves, but reaction selectivity may be compromised
Solution Approach 1:
The enzyme engineering approach modifies the catalytic parameters of the enzyme to maintain high stereoselectivity (>99% ee) even at substrate concentrations up to 1500 mM. The specific amino acid mutations preserve the enzyme's ability to discriminate between enantiomeric transitions while allowing operation at industrially relevant substrate concentrations, thus achieving both scalability and precision.
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 catalyst enables efficient reduction reactions with high yields (>90%) and stereoselectivity (>99% ee) at elevated substrate concentrations, overcoming inhibition issues and facilitating process scalability.
Implementation Method 1
the catalyst is a polypeptide comprising an amino acid sequence having at least 50% identity to SEQ ID NO: 1
Implementation Method 2
the use of a catalyst for catalysing a reduction reaction
Data Source
AI summary
Use of a catalyst in a method of reducing a substrate, the method comprising contacting a substrate with a catalyst, optionally in the presence of a co-substrate, thereby to generate a reduced substrate. The catalyst is a polypeptide comprising an amino acid sequence having at least 70% identity to SEQ ID NO: 1, SEQ ID NO: 7 or SEQ ID NO: 9. In the method the substrate concentration is at least 50 mM.