Using Essential Genes for Plasmid Selection in E. coli
Author Information
Author(s): Goh Shan, Good Liam
Primary Institution: Karolinska Institute, Stockholm, Sweden
Hypothesis
Can over-expression of an essential gene in E. coli enable selection using a chemical inhibitor instead of antibiotics?
Conclusion
The fabI-triclosan model system provides an alternative plasmid selection method based on essential gene over-expression, without the use of antibiotic-resistance genes and conventional antibiotics.
Supporting Evidence
- The new cloning vector, pFab, enabled selection by triclosan at 1 μM.
- pFab out-performed the parent pUC19-ampicillin system in cell growth, plasmid stability and plasmid yield.
- pFab was toxic to host cells in a way that was reversed by triclosan.
Takeaway
Scientists found a way to help bacteria grow without using antibiotics by using a special gene and a chemical that stops that gene from working. This method is safer and could help make medicines.
Methodology
The study involved constructing plasmids with the fabI gene and testing their performance in E. coli with and without the presence of triclosan.
Limitations
The need for triclosan for plasmid stability could be a disadvantage in large-scale production.
Digital Object Identifier (DOI)
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