Overview of Protein Expression System In 1983, two sample groups expressed eukaryotic genes in the colon (Harris et al., 1983; Wetzel and Goeddel, 1983). Its genetics, biochemistry and molecular biology have been well understood, so it is the preferred system for the expression of many foreign proteins. The biggest feature of the Escherichia coli expression system is low culture cost, strong tolerance, and high efficiency. The advantage of the Bacillus subtilis expression system is that the target protein can be secreted into the culture medium in a soluble active form with high yield, but it is expressed in the protein During the process, Bacillus subtilis will secrete some proteins to degrade the target protein, and the expression level of this system is often lower than that of the antibiotic expression system. Currently commonly used eukaryotic expression systems are: mammalian cell expression system , yeast expression system and baculovirus expression system (also called in
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