Aspergillus aculeatus Mutant Strain for High Enzyme Production
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Solution Overview
Problem
Current methods for producing cellulase and xylanase enzymes are costly, and there is a need for a microbial strain capable of producing high amounts of these enzymes for efficient saccharification of biomass, particularly using Aspergillus aculeatus which has not been chemically induced for enhanced enzyme production.
Innovation Solution
A mutant strain of Aspergillus aculeatus, designated E14-292, is genetically modified through chemical induction using methylethanesulfonate and detoxified with sodium thiosulfate, resulting in increased production of cellulase and xylanase, with the strain deposited under accession number NITE ABP-02391, and can be cultured for enzyme production using solid or liquid fermentation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical induction is applied to Aspergillus aculeatus, then cellulase and xylanase production is significantly increased, but the process complexity and cost of strain development increase
Solution Approach 1:
The patent applies chemical induction by changing the chemical parameters of the culture medium, specifically adding methylethanesulfonate at optimized concentrations (0.1-1.0 mM) to induce mutations that enhance enzyme production. This parameter change approach directly increases cellulase and xylanase productivity while managing process complexity through systematic optimization.
2Productivity
If chemical mutagen is used for strain improvement, then enzyme production capability is enhanced, but the safety and detoxification requirements increase
Solution Approach 1:
The patent converts the harmful effect of chemical mutagens into beneficial enzyme production enhancement. Methylethanesulfonate, initially a toxic mutagen, is used at controlled concentrations to induce genetic changes that increase cellulase and xylanase production. The harmful chemical is transformed into a tool for strain improvement, with detoxification achieved through controlled exposure and subsequent culture in normal media.
3Productivity
If recombinant genetic modification is used, then enzyme production is increased, but the manufacturing cost and technical difficulty increase
Solution Approach 1:
The patent employs chemical induction as a simpler, more economical alternative to expensive recombinant genetic modification techniques. By using affordable chemical mutagens like methylethanesulfonate and systematic screening, the process achieves enhanced enzyme production without the high costs and technical complexity of recombinant DNA technology, making it more accessible for industrial application.
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 strain E14-292 demonstrates significantly higher cellulase and xylanase production compared to the wild type, maintaining high productivity up to the 10th generation, and shows enhanced enzyme activity in both submerged and solid state fermentations, effectively saccharifying biomass with improved sugar yields.
Implementation Method 1
A mutant strain of Aspergillus aculeatus, designated E14-292, is genetically modified through chemical induction using methylethanesulfonate
Implementation Method 2
detoxified with sodium thiosulfate
Implementation Method 3
can be cultured for enzyme production using solid or liquid fermentation methods
Implementation Method 4
The cellulase group comprises of three types of enzyme: 1) endoglucanase, 2) exo-glucanase or cellobiohydrolase, and 3) β-glucosidase, which digests cellulose to glucose
Data Source
AI summary
The present invention relates to a novel mutant strain Aspergillus aculeatus E14-292 and a genetic modification process of said strain, wherein the mutant strain according to this invention can produce cellulase and xylanase more than the BCC199 (wild type). Moreover, the obtained enzymes can be used to digest the pretreatment bagasse to further produce sugars effectively.