Yeast Activator Mutations for Alcohol Tolerance
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Solution Overview
Problem
Microorganisms face challenges in maintaining cell viability and productivity during fermentation due to the negative impact of alcohols like ethanol and butanol, which inhibit cell growth and reduce fermentation productivity.
Innovation Solution
Development of recombinant host cells with modified yeast activator proteins, such as Yap1, Yap2, and others, and engineered butanol biosynthetic pathways to enhance cell viability and productivity, including specific amino acid substitutions and overexpression of genes involved in stress response and metabolic pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If microorganisms are used to produce alcohols through fermentation, then renewable and eco-friendly alternatives to petrochemical processes are achieved, but cell viability and productivity are reduced due to alcohol inhibition
Solution Approach 1:
The patent modifies yeast activator proteins through specific amino acid substitutions (e.g., Yap1 R268H, Yap2 R268H, Yap3 R268H, Yap4 R268H, Yap5 R268H, Yap6 R268H, Yap7 R268H, Yap8 R268H) to change the protein's interaction with target genes, thereby altering the cell's stress response parameters and improving alcohol tolerance while maintaining viability
Solution Approach 2:
The patent creates multiple copies or variants of yeast activator proteins with specific mutations to enhance the stress response pathway, allowing the microorganism to better cope with alcohol accumulation during fermentation
2Adaptability or versatility
If microorganisms are engineered to produce butanol from plant-derived materials, then petrochemical dependency is reduced, but cell growth is inhibited by butanol accumulation
Solution Approach 1:
The patent introduces amino acid substitutions in yeast activator proteins (Yap1-Yap8) to modify their DNA binding affinity or transcriptional activation capability, thereby changing the expression levels of stress response genes that protect cells from butanol-induced growth inhibition
Solution Approach 2:
The modified yeast activator proteins act as intermediaries that sense butanol stress and mediate the transcriptional response, bridging the gap between butanol accumulation and cellular protection mechanisms
3Reliability
If yeast activator proteins are modified to improve stress tolerance, then cell viability under alcohol stress is enhanced, but the complexity of genetic engineering increases
Solution Approach 1:
The patent focuses modifications on a single critical residue (R268) across multiple yeast activator proteins, simplifying the genetic engineering approach by targeting a specific parameter (amino acid position 268) rather than requiring comprehensive protein redesign
Solution Approach 2:
The patent applies the same R268H substitution across eight different yeast activator proteins (Yap1-Yap8), creating a universal solution that enhances stress tolerance through a consistent genetic modification strategy applicable to multiple targets
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 microorganisms exhibit improved tolerance to alcohol stress and increased productivity in producing fermentation products like butanol, maintaining cell viability and efficiency under stressful conditions.
Implementation Method 1
Yap1 is a transcription factor that functions as a modulator of oxidative stress in Saccharomyces cerevisiae
Implementation Method 2
A number of chemicals and consumer products may be produced utilizing fermentation as the manufacturing process
Data Source
AI summary
The invention relates to the development of microorganisms capable of producing fermentation products via an engineered pathway in the microorganisms. The invention also relates to microorganisms with improved cell viability and methods to improve cell viability and cell productivity of a microorganism.