Zhi K, Zhou X, Gao T, Liu K, Wang Z, Cai Y, Wang Z, Wang S, Liu J, Liu D, Ying H

Human epidermal growth factor (hEGF) plays a crucial role in promoting cell growth and has various clinical applications. Due to limited natural sources and the high cost of chemical synthesis, researchers are now exploring genetic engineering as a potential method for hEGF production. In this particular study, a novel hEGF ...

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expression system was developed using Saccharomyces cerevisiae. This system involved optimizing the promoter and signal peptide and deleting protease-coding genes PEP4, PRB1, and YAP3, overexpressing chaperones KAR2 and PDI1 in the protein secretion pathway, which led to a 2.01-fold increase in hEGF production compared to the wild type strain. Furthermore, biofilm-forming genes FLO11 and ALS3 were integrated to create a biofilm strain with adhesive properties. A biofilm-based immobilized continuous fermentation model was established to leverage the characteristics of this biofilm strain. Each batch of this model yielded 130?mg/L of hEGF, with a production efficiency of 2.71?mg/L/h - surpassing the production efficiency of traditional free fermentation (1.62?mg/L/h). This study presents a promising fermentation model for efficient hEGF production based on biofilm characteristics, offering valuable insights for the application of biofilm fermentation in the production of small molecule peptides.

Date: Nov. 15, 2024

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