Mutant DOI Synthase Enzyme Engineering
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Solution Overview
Problem
Current methods do not effectively enhance DOI synthase activity for efficient production of 2-deoxy-scyllo-inosose (DOI), a crucial intermediate in pharmaceutical and industrial chemical synthesis, limiting production efficiency and cost-effectiveness.
Innovation Solution
A modified DOI synthase with altered amino acid sequences, specifically mutations at key residues, is developed using evolutionary engineering to increase enzymatic activity, enabling higher DOI synthesis efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type DOI synthase is used, then the enzyme can catalyze the conversion of glucose 6-phosphate to DOI, but the production rate and efficiency are insufficient for cost-effective large-scale manufacturing
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of DOI synthase through site-directed mutagenesis. Specific amino acid residues were changed to alter the enzyme's catalytic properties, resulting in mutant enzymes with significantly enhanced DOI synthesis activity. This direct modification of molecular parameters (amino acid composition) resolves the contradiction by improving productivity while maintaining the enzyme's fundamental catalytic function.
Solution Approach 2:
The patent replaces the natural, unmodified enzymatic system with an engineered mutant enzyme system. By substituting the wild-type enzyme with specifically designed mutants having optimized amino acid sequences, the system achieves higher catalytic efficiency and productivity. This substitution of the biological component itself (enzyme replacement) directly addresses the insufficient production rate issue.
2Quantity of substance
If conventional petrochemical processes are used to produce six-membered carbocyclic compounds, then raw materials for chemical products can be obtained, but global resource exhaustion and environmental pollution occur
Solution Approach 1:
The patent replaces petrochemical processes with a biocatalytic system using engineered DOI synthase. Instead of relying on crude oil-based chemical synthesis, the invention uses genetically modified enzymes to catalyze the conversion of glucose 6-phosphate to DOI. This substitution of the entire production system from petrochemical to biotechnological processes simultaneously provides raw materials while eliminating the associated environmental harm and resource depletion.
Solution Approach 2:
The patent changes the fundamental parameter of raw material source from fossil resources to renewable biological substrates. By using glucose 6-phosphate (derived from carbohydrates) as the starting material instead of petroleum feedstocks, the process transforms the chemical production pathway to an environmentally sustainable route that maintains productivity while eliminating pollution and resource exhaustion issues.
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 modified DOI synthase achieves significantly higher DOI production rates compared to wild-type enzymes, facilitating cost-effective and efficient production of DOI for various chemical applications.
Implementation Method 1
an enzyme that converts a carbohydrate as a starting material into a carbocycle. This enzyme has been purified from a microorganism belonging to Bacillus circulans, which is a butirosin-producing bacterium, and catalyzes multi-step reactions using glucose 6-phosphate as a substrate
Data Source
AI summary
A polypeptide includes, in the amino acid sequence of SEQ ID NO: 1 or a similar sequence, at least one specific amino acid substitution on at least one of the 14th, 37th, 209th, 293rd, and 319th amino acid residues from the N-terminal of the amino acid sequence of SEQ ID NO: 1. A polynucleotide, an expression cassette, a vector, and a transformant include a base sequence encoding the amino acid sequence of the polypeptide. A method of producing the polypeptide and a method of producing 2-deoxy-scyllo-inosose are also provided.