Methylobacillus EPS Gene Disruption for Fermentation Processing
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Solution Overview
Problem
Methanol-based bioprocesses face challenges due to excessive exopolysaccharides (EPS) production in Methylobacillus bacteria, leading to issues like culture foaming, cell clumping, and difficulties in centrifugation and filtration, which hinder large-scale methanol fermentations.
Innovation Solution
Genetically modified Methylobacillus bacteria with reduced EPS production, achieved by disrupting EPS gene clusters, resulting in decreased EPS synthesis and improved bioprocess efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Methylobacillus bacteria are used for methanol fermentation, then rapid growth and biomass formation are achieved, but excessive EPS production occurs leading to foaming, cell clumping, and processing difficulties
Solution Approach 1:
The patent applies the extraction principle by removing the harmful EPS production capability from the Methylobacillus bacteria through genetic modification. Specifically, the bacteria are engineered to lack the eps operon genes responsible for exopolysaccharide synthesis, thereby extracting the harmful factor (EPS production) while preserving the beneficial rapid growth characteristics of the original strain.
2Reliability
If EPS production is high, then protection from dessication and biofilm formation are improved, but culture foaming and cell clumping increase making centrifugation and filtration difficult
Solution Approach 1:
The patent removes the EPS production capability through genetic modification, specifically by disrupting the eps operon genes. This extraction of the harmful factor eliminates culture foaming and cell clumping, thereby improving ease of operation for centrifugation and filtration while the bacteria maintain sufficient stress protection through other mechanisms.
3Productivity
If EPS gene clusters are disrupted to reduce EPS production, then downstream processing efficiency is improved, but potential loss of protective functions may occur
Solution Approach 1:
The patent converts the harmful effect of excessive EPS production into a benefit by genetically modifying the bacteria to reduce EPS synthesis. The disruption of eps operon genes, which originally caused processing difficulties, is transformed into a advantageous trait that improves downstream processing efficiency while the bacteria maintain adequate stress protection through alternative mechanisms.
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 reduction in EPS production significantly improves strain handling, downstream processing, and methanol tolerance, making the modified bacteria suitable for large-scale methanol fermentations by reducing foaming, clumping, and enhancing processing efficiency.
Implementation Method 1
Genetically modified Methylobacillus bacteria with reduced EPS production, achieved by disrupting EPS gene clusters
Implementation Method 2
achieved by disrupting EPS gene clusters, resulting in decreased EPS synthesis
Data Source
AI summary
The present invention generally relates to the biotechnology engineering, and specifically to genetically modified bacteria of the genus Methylobacillus which have improved properties making them particularly useful in large scale methanol fermentations. More specifically, the present invention provides a bacterium of the genus Methylobacillus which has been modified to have a decreased production of exopolysaccharides (EPS) compared to an otherwise identical bacterium that does not carry said modification. The present invention further provides a method for producing a biochemical compound using a genetically modified bacterium of the present invention.