ArticleIranian biomedical journal2021
Targeted Deletion of Los1 Homologue Affects the Production of a Recombinant Model Protein in Pichia pastoris.
Article in Iranian biomedical journal, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed, 0 citations in OpenAlex.
- Deletion of low-essentiality, secretion-associated genes enhances recombinant protein production in Komagataella phaffii.Microbial cell factories · 2026Article
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9 authors at 3 institutions in 1 country.
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Abstract
Background: The methylotrophic yeast Pichia pastoris is an appealing production host for a variety of recombinant proteins, including biologics. In this sense, various genetic- and non-genetic-based techniques have been implemented to improve the production efficiency of this expression platform. Loss of supression (Los1) encodes a non-essential nuclear tRNA exporter in Saccharomyces cerevisiae, which its deletion extends replicative lifespan. Herein, a los1-deficient strain of P. pastoris was generated and characterized. Methods: A gene disruption cassette was prepared and transformed into an anti-CD22-expressing strain of P. pastoris. A δ los1 mutant was isolated and confirmed. The drug sensitivity of the mutant was also assessed. The growth pattern and the level of anti-CD22 single-chain variable fragment (scFv) expression were compared between the parent and mutant strains. Resuults: The los1 homologue was found to be a non-essential gene in P. pastoris. Furthermore, the susceptibility of los1 deletion strain to protein synthesis inhibitors was altered. This strain showed an approximately 1.85-fold increase in the extracellular level of anti-CD22 scFv (p < 0.05). The maximum concentrations of total proteins secreted by δ los1 and parent strains were 125 mg/L and 68 mg/L, respectively. Conclusion: The presented data suggest that the targeted disruption of los1 homologue in P. pastoris can result in a higher expression level of our target protein. Findings of this study may improve the current strategies used in optimizing the productivity of recombinant P. pastoris strains.
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