But other operons respond to the presence of their small molecule signal ligand; that is, they are negatively regulated by a repressor protein, but they are inducible (i.e., they can be turned on ...

Learn about our Editorial Policies. LacI is a tetrameric protein, using two dimers to bind two specific, identical DNA sequences. This specificity narrows the ability to use the LacI system in cases ...

An international collaboration has achieved an important breakthrough in understanding the genetic mechanisms that allow ...

A global team has made a significant advance in understanding how bacterial plasmids contribute to antibiotic resistance.