Molecular Biology of the Gene 7th Edition by Richard Losick, James Watson, Michael Levine, Tamara Baker, Alexander Gann

Exercise 7

In the laboratory, you want to purify a protein that is normally toxic in E. coli cells. Your advisor suggests cloning the gene encoding your protein into an expression vector that uses the araBAD promoter. Why is it ideal to use the araBAD promoter for expression of your gene of interest in E. coli cells?