The Regulator Gene directs the activity of the operator gene by producing inhibitor proteins called repressors. This repressor protein binds to the operator gene and blocks the path of RNA polymerase, thus preventing transcription. If an inducer is present in the system, it binds to the repressor which undergoes conformational change and becomes inactive. As the in­active repressor cannot bind to the promoter, the structural genes get acti­vated and protein synthesis continues.