Microbial Taurine Fermentation Under Mild pH and Temperature
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Solution Overview
Problem
Current chemical and biological processes for producing organosulfur compounds like taurine are inefficient, costly, and environmentally harmful, requiring high temperatures, corrosive acids, and non-renewable sources, with a need for a more sustainable and cost-effective alternative.
Innovation Solution
A method using genetically engineered prokaryotic cells, such as Corynebacterium glutamicum, to produce organosulfur compounds like taurine through fermentation with specific genetic modifications, including vanin, cysteamine dioxygenase, and flavin-containing monooxygenase pathways, under controlled pH and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis from ethylene oxide is used, then production efficiency is improved, but safety hazards and environmental pollution increase due to toxicity, volatility, and explosive potential
Solution Approach 1:
The patent replaces chemical synthesis mechanisms with biological fermentation mechanisms. Genetically modified microorganisms (Corynebacterium glutamicum, Escherichia coli, Bacillus subtilis) are used to convert methionine and cysteine into taurine through endogenous metabolic pathways, eliminating the need for ethylene oxide and its associated safety hazards while maintaining production efficiency
Solution Approach 2:
The patent introduces intermediary substances (methionine and cysteine) that can be safely transported and stored, which are then converted by genetically modified microorganisms into the final product taurine. This intermediary approach avoids direct handling of hazardous ethylene oxide while achieving the same production goal
2Ease of manufacture
If chemical synthesis from MEA is used, then production is achieved, but manufacturing complexity increases due to multi-step batch process requiring high temperatures and corrosive acids
Solution Approach 1:
The patent segments the complex chemical synthesis process into simple biological steps performed by genetically modified microorganisms. The multi-step chemical process involving MEA, sulfuric acid, and sulfite reagents is replaced by single-step fermentation processes in Corynebacterium glutamicum, Escherichia coli, or Bacillus subtilis, dramatically simplifying manufacturing while reducing equipment requirements
Solution Approach 2:
The patent changes the operating parameters from extreme chemical conditions (high temperatures, corrosive acids, high pressure) to mild biological conditions (ambient temperature, neutral pH, atmospheric pressure). This parameter transformation simplifies equipment requirements and manufacturing complexity while maintaining product yield
3Ease of manufacture
If chemical synthesis methods are used, then production cost is reduced, but environmental sustainability deteriorates due to reliance on non-renewable sources and pollution
Solution Approach 1:
The patent converts the previously harmful chemical synthesis process into a beneficial biological fermentation process. Waste streams from the fermentation process can be utilized as fertilizers or animal feed, and the genetically modified microorganisms can consume agricultural byproducts as substrates, transforming potential waste into valuable products while eliminating chemical pollution
Solution Approach 2:
The patent changes the fundamental nature of the production process from petrochemical-based to bio-based, using renewable biological resources instead of non-renewable fossil fuels. This parameter change maintains cost-effectiveness while dramatically improving environmental sustainability by eliminating toxic emissions and waste
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
This method enables large-scale, environmentally friendly production of organosulfur compounds at mild conditions, reducing energy consumption and preventing product degradation, offering a cost-effective alternative to existing methods.
Implementation Method 1
a method to produce an organosulfur compound through the fermentation of a sugar source and a sulfur source by genetically manipulated microorganisms
Data Source
AI summary
A method of producing an organosulfur compound from a prokaryotic cell wherein said method comprises the steps of:a. providing a live prokaryotic cell capable of expressing at least one gene for the production of said organosulfur compound;b. exposing said live prokaryotic cell to a culture media with a pH of between 4 and 11 containing a carbon source and a sulfur source thereby creating an incubation mixture;c. incubating said live prokaryotic cell in said incubation mixture under aerobic or anaerobic conditions at a temperature ranging from 0° C. to 60° C. for a period of time sufficient for the expression of said at least one gene for the production of said organosulfur compound;d. recovering said organosulfur compound from the bacterial cells and/or spent media; ande. optionally, re-exposing said live prokaryotic cell to an unused media or spent media for the continuous production of said organosulfur compound of interest.