What are the disadvantages of using bacteria for protein production?

• A. Bacteria produce high yields of desired proteins
• B. They have low growth rates compared to eukaryotes
• C. Endotoxins and the inability to secrete protein products
• D. They can only express human proteins

Answer: (C)

Using bacteria for protein production poses certain challenges, notably the presence of endotoxins and the limitation in secreting some protein products into the culture medium. Endotoxins, which are components of the bacterial cell membrane (specifically, lipopolysaccharides), can contaminate the protein of interest. These contaminants can elicit strong immune responses when the proteins are used in medical applications, making it crucial to remove endotoxins during purification processes.

Furthermore, many eukaryotic proteins require post-translational modifications for proper functionality, such as glycosylation or proper folding, which bacteria may not perform adequately. As a result, this can lead to the production of proteins that are misfolded or non-functional, limiting their usefulness in therapeutic or industrial contexts.

The other choices do not accurately reflect the disadvantages. While it is true that bacteria can produce high yields of proteins, their growth rates do not necessarily justify production inefficiencies. Also, bacteria are quite capable of producing a wide variety of proteins, including those from humans, so the suggestion that they can only express human proteins is incorrect. Thus, the challenges posed by endotoxins and the inability to secrete the desired proteins make this choice the most accurate representation of the disadvantages associated