Operators and silencers
Operators and silencers are control elements that are involved in the transcription of genes.
Operators are present in and control the prokaryotic operon.
Transcription factors bind to operator sequence. These proteins either activate or repress gene expression by controlling whether RNA polymerase is able to bind to the promoter.
- Silencers are sequences of DNA that repressor proteins can bind to. They inhibit and stop transcription. Silencers are found in both eukaryotes and prokaryotes.