Engineered Heme Enzymes for Stereoselective Sulfimidation
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Solution Overview
Problem
Cytochrome P450 enzymes, despite their high regio- and stereo-selectivity, face limitations due to their large size and requirement for expensive reducing equivalents, making them challenging to handle and integrate into chemical synthesis efficiently.
Innovation Solution
Engineered heme enzymes, specifically variants of cytochrome P450 enzymes with amino acid mutations, are used to catalyze nitrene transfer reactions into organosulfur compounds, forming new S—N bonds with high stereoselectivity and increased total turnover numbers, utilizing a nitrene source such as azides to produce sulfimidation products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cytochrome P450 enzymes are used for catalysis, then high regio- and stereo-selectivity is achieved, but the large size and requirement for expensive reducing equivalents make them difficult to handle and integrate into chemical synthesis
Solution Approach 1:
The patent extracts the catalytic heme domain from the full-length cytochrome P450 enzyme, creating a truncated enzyme that retains catalytic activity while removing unnecessary portions. This extraction reduces the overall size and complexity of the enzyme, making it easier to handle and integrate into chemical synthesis while preserving the high regio- and stereo-selectivity provided by the heme catalytic center
Solution Approach 2:
The patent segments the cytochrome P450 enzyme into functional domains, specifically isolating the heme-containing catalytic domain from the full protein structure. This segmentation allows the catalytic function to be separated from the structural complexity, enabling easier handling and integration into synthetic workflows while maintaining the selective catalytic properties
2Manufacturing precision
If cytochrome P450 enzymes are used for catalysis, then high regio- and stereo-selectivity is achieved, but the requirement for expensive reducing equivalents increases cost
Solution Approach 1:
The patent implements a self-service system where the truncated heme enzyme works in conjunction with a separate, reusable reducing agent system. The enzyme itself does not consume expensive reducing equivalents in the traditional sense, as the reducing agent can be regenerated and reused multiple times, making the overall process more cost-effective while maintaining high selectivity
3Productivity
If engineered heme enzyme variants with amino acid mutations are used, then total turnover numbers and enantioselectivity are increased, but enzyme design and optimization complexity increases
Solution Approach 1:
The patent applies local quality changes by introducing specific amino acid mutations at key positions within the heme enzyme structure. These localized mutations are strategically placed to enhance catalytic activity and enantioselectivity without requiring complete redesign of the entire enzyme. The mutations are focused on specific regions that directly influence substrate binding and catalytic efficiency, thereby increasing turnover numbers while limiting the overall design complexity to manageable local modifications
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 heme enzymes demonstrate enhanced catalytic activity and enantioselectivity, enabling efficient formation of sulfimides and sulfoximines with improved regio- and enantioselectivity, expanding the scope of biocatalytic transformations and biosynthetic pathways.
Implementation Method 1
heme enzymes that catalyze the nitrene transfer or insertion into an organosulfur compounds comprising an —S— target site to form a new S—N bond
Implementation Method 2
heme enzyme variants comprising at least one or more amino acid mutations therein that catalyze sulfoxidation and/or sulfimidation, making products described herein with high stereoselectivity
Data Source
AI summary
The disclosure generally relates to the fields of synthetic organic chemistry. In particular, the present disclosure relates to methods and systems for the imidation of sulfides.