User:Scmohr/ProtCode Repressors & Activators

The crystal structure of the tryptophan repressor dimer binding to its palindromic DNA operator sequence fragment.

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Repressors & Activators

Repressors and activators are transcription factors -- proteins that bind to specific DNA sequences and regulate the transcription of one or more nearby genes. They also bind "ligands," small molecules that play a role in repressing or activating transcription by altering the conformations (3D-shape) of the transcription factors.