A new host strain named allgal has been developed to enhance the production of recombinant proteins in Saccharomyces cerevisiae without the need for an expensive inducer. By eliminating all genes related to galactose metabolism, allgal showed a 15–38% increase in growth compared to the gal80 mutant. Additionally, the secretion of recombinant proteins was boosted by 16–22% in fed-batch fermentation, making the allgal mutant a cost-effective option for producing recombinant proteins using the GAL10 promoter in S. cerevisiae.
Saccharomyces cerevisiae is a popular host for recombinant protein production due to its high cell density culture and efficient secretion capabilities. The choice of promoter significantly impacts protein production, with GAL1 and GAL10 promoters being commonly used in S. cerevisiae. The GAL promoters exhibit high expression levels when induced by galactose, making them ideal for recombinant protein production in this yeast species.
The regulation of GAL genes involves activators and repressors that respond to the presence or absence of galactose. The gal80 mutant of S. cerevisiae allows for constitutive expression under GAL promoters without the need for galactose induction. However, the gal80 mutant showed slower cell growth in fed-batch fermentation, possibly due to the unnecessary expression of GAL metabolism genes consuming cellular resources. To address this, the allgal mutant was engineered by disrupting GAL80 and all GAL structural genes, resulting in improved growth and protein expression under the GAL10 promoter.
In comparison to wild-type and other mutants, the allgal strain exhibited superior growth and protein secretion levels in fed-batch fermentation. The allgal mutant’s enhanced expression of recombinant proteins, such as CalB1422, HSA, and hEGF, highlights its potential as a robust host for diverse protein production applications. By maintaining low glucose concentrations to minimize repression, the allgal strain consistently outperformed the gal80 mutant across various recombinant proteins tested.
The study’s findings underscore the efficacy of the allgal mutant as a versatile platform for efficient GAL promoter-driven protein expression in S. cerevisiae. The enhanced growth and secretion capabilities of the allgal strain make it a promising candidate for industrial-scale recombinant protein production, offering a cost-effective and high-yield alternative to existing host strains. Further optimization and scale-up studies could solidify the allgal strain’s position as a valuable tool in biotechnological applications.
Key Takeaways:
– The allgal mutant offers a compelling solution for robust protein expression in S. cerevisiae without the need for costly inducers.
– By disrupting GAL metabolism genes, the allgal strain demonstrates improved growth and protein secretion compared to existing mutants.
– The allgal mutant shows consistent performance across different recombinant proteins, highlighting its versatility and reliability as a host strain.
– Enhanced expression levels and cost-effectiveness position the allgal strain as a promising platform for industrial-scale recombinant protein production.
Tags: yeast, upstream, secretion
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