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There are two main strategies for the induction of transcription: a strong promoter is negatively controlled by a repressor protein and induction of transcription is effected by an inducer (a ligand that inactivates the repressor).
Although transcription is performed by RNA Polymerase, the enzyme needs other proteins to produce the transcript. These factors are either associated directly with RNA Polymerase or add in building the actual transcription apparatus. The general term for these associated proteins is transcription factor.he definition is reflects the interaction of the all of the important proteins and the DNA to which the bind. Promoter-all the DNA sequences containing binding sites for RNA polymerase and the transcription factors necessary for normal transcription Copyright Â© 1998.