Soluble Methane Monooxygenase Mutations for Activity and Expression
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Solution Overview
Problem
There is a challenge in expressing soluble diiron monooxygenases effectively in industrially relevant hosts, limiting the use of less expensive raw materials like short alkanes for industrial chemical production due to the high cost of sugar and the need for enzymes with improved function, solubility, substrate binding affinity, and reduced product inhibition.
Innovation Solution
Development of mutant soluble diiron monooxygenase systems with specific mutations in various subunits, such as hydroxylase alpha, accessory protein B, reductase subunit C, and others, to enhance activity and expression in hosts like Escherichia coli, Corynebacterium glutamicum, and Bacillus methanolicus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If soluble diiron monooxygenases are expressed in industrially relevant hosts, then the conversion of short alkanes to industrial products can be achieved, but the expression difficulty and low activity limit the process efficiency
Solution Approach 1:
The patent applies parameter changes by systematically mutating specific amino acid residues in the soluble diiron monooxygenase enzyme structure. Multiple point mutations were introduced at strategically selected positions to optimize enzyme expression levels, solubility, and catalytic activity in industrial hosts such as E. coli and C. glutamicum, thereby resolving the contradiction between expression difficulty and productivity
Solution Approach 2:
The patent creates mutant variants of the soluble diiron monooxygenase enzyme by copying the wild-type enzyme structure and introducing specific modifications. These copied and modified enzyme versions demonstrate improved expression and activity characteristics in industrial hosts while maintaining the core catalytic function for short alkane conversion
2Productivity
If sugar is used as raw material for fermentation, then industrial products can be produced, but the high cost of sugar limits economic viability
Solution Approach 1:
The patent enables a fundamental parameter change in the substrate being processed by the enzyme system. By optimizing soluble diiron monooxygenase activity, the process can now efficiently convert short alkanes (methane, ethane, propane) instead of sugar, thereby changing the raw material basis from expensive sugar to inexpensive natural gas-derived alkanes, improving economic viability while maintaining productivity
3Reliability
If wild-type soluble diiron monooxygenase is used, then the natural function is preserved, but the solubility and substrate binding affinity are insufficient for industrial application
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid mutations that enhance enzyme solubility and substrate binding affinity while preserving the core catalytic function. Mutations at specific residues improve the enzyme's interaction with short alkane substrates and increase its solubility in industrial host cells, thereby resolving the contradiction between maintaining natural function and improving performance parameters
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 mutant systems demonstrate increased activity and functional expression, enabling the conversion of less expensive raw materials like short alkanes into industrial products at a lower cost and with improved efficiency.
Implementation Method 1
The mutant systems demonstrate increased activity and functional expression, enabling the conversion of less expensive raw materials like short alkanes into industrial products
Data Source
AI summary
Improved soluble methane monooxygenases and soluble methane monooxygenase systems are provided.