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Gene Expression

Gene expression can be regulated by DNA sequence and proteins that bind DNA.

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Gene Expression
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Vocabulary

activator

Regulatory protein that enhances the interaction between RNA polymerase and a particular promoter.

cis-regulatory element

Regulatory segment of DNA; site where a transcription factor may bind.

enhancer

Sites on the DNA strand that are bound by activators; brings a transcription factor to the initiation complex.

initiation complex

Complex composed of RNA polymerase and transcription factors; needed for transcription to begin.

regulatory protein

DNA-binding protein that regulates gene expression.

repressor

Proteins that bind to non-coding sequences on DNA that are close to the promoter region; impedes RNA polymerase's progress along the strand.

transcription factor

A DNA-binding protein involved in regulating gene expression.

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