Regulation of Protein Synthesis


Must have method to either turn genes "on" or else turn them "off"

            Else all cells would make same enzymes


Regulation in bacteria

            Structural gene

            Regulatory gene



lac operon (Escherichia coli)

            three kinds of regulatory genes

                        promoter site

                        operator site

                        regulator gene


            control activity of RNA polymerase to control transcription

            inducer molecule = lactose