Trichoderma Promoter for Glucose-Active Protein Expression
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Solution Overview
Problem
Current molecular biotechnology methods face challenges in achieving maximum expression of cloned genes in filamentous fungal host cells, particularly in controlling protein production without inducing cellulase gene expression, and require promoters that are active at various temperatures.
Innovation Solution
A promoter sequence (SEQ ID NO:1) and its variants are used to direct protein expression in filamentous fungal host cells, specifically active in growth media with glucose as a carbon source, and functional at both 37°C and lower temperatures, allowing for protein production without the need for cellulose or cellulose-related sugars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional promoters are used to drive protein expression in filamentous fungal host cells, then protein production is achieved, but cellulase gene expression is inadvertently induced when cellulose or cellulose-related sugars are present in the growth medium
Solution Approach 1:
The promoter region is divided into specific functional segments (SEQ ID NO:1 and its variants) that can be selectively used to drive protein expression without triggering cellulase gene induction. This segmentation allows isolation of the promoter elements necessary for protein expression while excluding elements that would induce cellulase genes.
Solution Approach 2:
The patent introduces a specific promoter sequence (SEQ ID NO:1) as an intermediary element that mediates between the need for protein expression and the need to avoid cellulase induction. This promoter acts as a selective controller that enables protein production in glucose-based media without activating cellulase genes, which are normally induced by cellulose or cellulose-related sugars.
2Productivity
If growth media containing cellulose or cellulose-related sugars are used to induce promoter activity, then protein expression is enhanced, but unwanted cellulase gene expression is activated
Solution Approach 1:
The patent changes the chemical parameter of the growth medium by using glucose as the sole carbon source instead of cellulose or cellulose-related sugars. This parameter change maintains promoter activity for protein expression while eliminating the induction of cellulase genes, which require cellulose or its derivatives for activation.
3Productivity
If temperature is increased to 37°C to enhance protein production, then metabolic activity is improved, but promoter activity may be reduced at this temperature
Solution Approach 1:
The patent identifies and utilizes a promoter variant that has been optimized to maintain activity across a broader temperature range, including 37°C. This represents a change in the promoter's thermal parameters, allowing it to function reliably at higher temperatures where conventional promoters might become less active, thereby supporting enhanced metabolic activity without sacrificing promoter function.
Data Source
AI summary
A promoter for use in producing proteins in filamentous fungal host cells is provided. In one embodiment, the promoter comprises SEQ ID NO:1, or a variant or a truncated form thereof that has promoter activity in a host cell. Also provided are recombinant nucleic acids, vectors containing the promoter and host cells containing a recombinant nucleic acid or vector. Methods of producing a protein using the host cells are also provided.