Repressor Function Reduction in Trichoderma reesei for Cellulase Production
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Solution Overview
Problem
Existing Trichoderma reesei strains have limitations in protein production capabilities, particularly cellulase production, and there is a need for further enhancement of protein-producing abilities through novel mechanisms.
Innovation Solution
A mutant strain of Trichoderma reesei is developed by eliminating or reducing the function of specific polypeptides with amino acid sequences represented by SEQ ID NOs: 4, 5, and 6, specifically through frameshift mutations or deletions of HSF-type DNA-binding, TLD, and F-box domains, enhancing protein production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Trichoderma reesei strains are used for protein production, then basic cellulase production is achieved, but protein production capability is limited
Solution Approach 1:
The patent extracts and eliminates specific repressor polypeptides (SEQ ID NOs: 4, 5, and 6) from the Trichoderma reesei strain. By removing these negative regulatory elements, the patent unleashes the full protein production potential of the organism without the constraining influence of the repressors, thereby resolving the contradiction between improving productivity and maintaining reliability.
Solution Approach 2:
The patent changes the genetic parameters of the Trichoderma reesei strain by introducing mutations that eliminate or reduce the function of specific polypeptides. This genetic parameter change transforms the strain from a conventional limited-producer to a high-capacity protein production system, achieving both enhanced productivity and stable performance.
2Productivity
If protein production is enhanced through conventional methods, then production amount increases, but novel production mechanisms are not discovered
Solution Approach 1:
The patent converts the previously harmful or limiting effect of repressor polypeptides into a benefit. By identifying and eliminating these repressors, the patent discovers a novel production mechanism where removing negative regulators becomes the key to enhancing protein production. This approach not only increases production amount but also reveals new insights into fungal protein production mechanisms.
3Productivity
If specific polypeptide functions are eliminated through mutation, then protein production is enhanced, but genetic complexity increases
Solution Approach 1:
The patent applies the extraction principle by specifically removing or disabling the functions of only three key repressor polypeptides (SEQ ID NOs: 4, 5, and 6) rather than attempting comprehensive genetic modification. This targeted approach enhances protein production while minimizing the overall genetic complexity and making the modification process more manageable and scalable.
Data Source
AI summary
A mutant strain of Trichoderma reesei, the mutant strain having a mutation that eliminates or reduces a function of a polypeptide consisting of the amino acid sequence represented by SEQ ID No: 5. A method produces a cellulase, the method including a step of cultivating the mutant strain of Trichoderma reesei, the mutant strain having a mutation that eliminates or reduces a function of a polypeptide consisting of the amino acid sequence represented by SEQ ID No. 5.