Butanol-Tolerant Pediococcus Strains for High-Titer Fermentation
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Solution Overview
Problem
Current methods for producing butanol are limited by microorganism toxicity to butanols, restricting high-titer bioproduction, and there is a need for microorganisms tolerant to 1-butanol, 2-butanol, and isobutanol.
Innovation Solution
Identification and genetic engineering of butanol-tolerant microorganisms, such as Pediococcus pentosaceus and Pediococcus acidilactici strains, capable of growth in high butanol concentrations, equipped with butanol biosynthetic pathways for the production of 1-butanol, 2-butanol, or isobutanol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microorganisms are used for butanol fermentation, then fermentation process can be maintained, but butanol toxicity inhibits high-titer production
Solution Approach 1:
The patent applies parameter changes by modifying the host microorganism's physiological parameters through genetic engineering to increase butanol tolerance. Specific genes are overexpressed or mutated to change the organism's resistance parameters, enabling survival and growth in high butanol concentrations that would otherwise be toxic, thereby resolving the contradiction between productivity and toxicity.
Solution Approach 2:
The patent converts the harmful effect of butanol toxicity into a beneficial selection pressure. By exposing microorganisms to increasing butanol concentrations during isolation and cultivation, the process selects for tolerant strains, transforming the harmful toxin into a tool for identifying and developing high-producing strains capable of high-titer production.
2Productivity
If petrochemical synthesis methods are used for butanol production, then production capacity is high, but environmental friendliness and cost are poor
Solution Approach 1:
The patent replaces mechanical/chemical synthesis systems with biological fermentation systems. Instead of using petrochemical feedstocks and chemical catalysts, the invention uses genetically engineered microorganisms to biosynthesize butanol from renewable resources, substituting a chemical manufacturing system with a biological one that is more environmentally friendly and potentially more cost-effective.
3Object-affected harmful factors
If chemical mutagenesis is used to isolate butanol-tolerant strains, then tolerance is improved, but growth is still inhibited at less than 2.0% w/v 1-butanol
Solution Approach 1:
The patent applies preliminary action by pre-adapting microorganisms to butanol stress through gradual exposure during the isolation process. Strains are subjected to increasing concentrations of butanol before final selection, allowing them to develop tolerance mechanisms in advance. This preliminary adaptation enables the strains to subsequently grow and produce butanol at concentrations exceeding 2.0% w/v, overcoming the growth inhibition limitation.
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
These tolerant microorganisms enable low-level growth in 3.0% 1-butanol and can be genetically engineered for high-titer bioproduction of butanols, overcoming toxicity limitations and enhancing industrial production capabilities.
Implementation Method 1
These tolerant microorganisms enable low-level growth in 3.0% 1-butanol and can be genetically engineered for high-titer bioproduction of butanols, overcoming toxicity limitations
Implementation Method 2
Methods of producing butanol by fermentation are also known, where the most popular process produces a mixture of acetone, 1-butanol and ethanol and is referred to as the ABE processes
Data Source
AI summary
Pediococcus bacteria having enhanced tolerance to butanols have been isolated. The bacteria are useful for the fermentative production of butanol.