Fungal Cell Engineering for Higher Recombinant Protein Secretion
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Solution Overview
Problem
Existing fungal cells struggle to produce high levels of recombinant proteins efficiently, as they face challenges in protein folding, trafficking, and degradation, limiting their industrial application in biopharmaceuticals and enzymes.
Innovation Solution
Genetic modification of fungal cells by disrupting the Tda3p gene and combining it with specific gene deletions and overexpressions, such as HDA2, VPS5, GOS1, and COG5, to enhance intracellular transport between the Golgi and endosome, thereby increasing recombinant protein production and secretion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fungal cells are used for recombinant protein production, then protein folding and secretion capacity is improved, but protein production levels remain limited due to degradation and trafficking challenges
Solution Approach 1:
The patent applies parameter changes by disrupting the TDA3 gene to alter the intracellular trafficking parameters. This genetic modification changes the protein degradation and trafficking rates, allowing proteins to be retained longer in the secretory pathway and accumulate to higher levels before secretion, thereby resolving the contradiction between folding reliability and production productivity
Solution Approach 2:
The patent extracts or removes the harmful function of Tda3p protease activity through gene disruption. By eliminating this protease that degrades recombinant proteins during trafficking, the system prevents protein loss and enables accumulation of high protein levels without compromising the folding capacity of the cell
2Stability of the object's composition
If Tda3p gene is disrupted to reduce protein degradation, then recombinant protein stability is improved, but intracellular transport efficiency may be affected
Solution Approach 1:
The patent converts the harmful protease activity of Tda3p into a beneficial effect by disrupting the gene. The disruption prevents degradation of recombinant proteins during trafficking, stabilizing them throughout the secretory pathway. The moderate effect on transport speed is acceptable because the stability gain allows for protein accumulation and eventual secretion at high levels
3Productivity
If multiple gene modifications are combined to enhance protein secretion, then protein yield is increased up to 500%, but cell complexity and metabolic burden increase
Solution Approach 1:
The patent merges multiple gene modifications including TDA3 disruption with overexpression of chaperone genes (KAR2, PDI1, HSP82) and secretion pathway genes (SEC12, SEC23, SEC63). This combination of modifications works synergistically to achieve up to 500% increase in protein yield, where each modification addresses a different bottleneck in the protein production pathway
Data Source
AI summary
The present invention related to the provision of genetically modified fungal cells, such as yeast cells with an improved ability for producing and secreting different recombinant proteins. The improved ability is obtained by disruption in intracellular transport between the Golgi and the endosome. In particular embodiments, the disruption is achieved by downregulation or deletion of the gene encoding a Tda3p homolog. The fungal cell and method of the invention would allow for large-scale production of recombinant proteins in fungal cells.