Trichoderma Mutant Strain Enhancing Cellulase Production
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Solution Overview
Problem
Current genetic modifications in filamentous fungi of the genus Trichoderma often result in decreased cellulase production, and there is a need to identify novel mechanisms to enhance protein production, particularly β-glucosidase production, which is a limiting factor in saccharifying enzymes.
Innovation Solution
A mutant strain of Trichoderma is developed by reducing the function of a specific polypeptide with an amino acid sequence represented by SEQ ID NO: 2, specifically through deletion or mutation of its sugar transporter domain, leading to increased protein production and improved cellulase specific activities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If genetic modifications are made to increase cellulase production amount, then protein production is enhanced, but the function of existing transcription factors may be insufficient to achieve further improvements
Solution Approach 1:
The patent extracts and removes the Cre1 transcription factor from the system to eliminate its repressive effect on cellulase production. By deleting the cre1 gene, the patent achieves high cellulase production without being constrained by the limited control mechanism of existing transcription factors, thus resolving the contradiction between productivity enhancement and control mechanism complexity.
Solution Approach 2:
Instead of trying to enhance the function of existing transcription factors to increase cellulase production, the patent inverts the approach by removing the repressive transcription factor Cre1. This inversion strategy allows the system to achieve high productivity by eliminating the bottleneck rather than trying to amplify existing control mechanisms.
2Adaptability or versatility
If sugar transporter function is deleted to modify Trichoderma reesei, then genetic modification is achieved, but cellulase production amount decreases
Solution Approach 1:
The patent converts the harmful effect of Cre1 repression into a benefit by deleting the cre1 gene. What was previously a limiting factor (Cre1 repression) becomes an advantage when removed, allowing high cellulase production. This resolves the contradiction by transforming the repressive mechanism into a productive state through targeted gene deletion.
3Productivity
If Cre1 function is reduced to acquire high cellulase-producing ability, then protein production is enhanced, but the mechanism is considered merely partial
Solution Approach 1:
The patent extracts the Cre1 transcription factor from the control mechanism entirely through gene deletion, achieving high cellulase production. By removing this single critical repressive element, the patent achieves reliable and complete control over cellulase production without needing to manage multiple partial control mechanisms.
Data Source
AI summary
A mutant strain of a filamentous fungus of the genus Trichoderma having a reduced function of a polypeptide consisting of the amino acid sequence represented by SEQ ID NO: 2; and a method of producing a sugar from a cellulose-containing biomass, the method including: step a of producing a cellulase by cultivating a Trichoderma reesei mutant strain having a reduced function of a polypeptide consisting of the amino acid sequence represented by SEQ ID NO: 2, and step b of saccharifying the biomass by using the cellulase obtained in the step a.