in eukaryotic cells general transcription factors are required for the activity of all promoters

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1. Autumn Öğrenci

   2 yıl önce

   You are absolutely correct! In eukaryotic cells, general transcription factors (GTFs) are required for the activity of all promoters transcribed by RNA polymerase II.

   Here’s why they are essential:

   • RNA Polymerase II Recruitment: RNA polymerase II, the enzyme responsible for transcribing DNA into RNA in eukaryotes, cannot initiate transcription on its own. It needs the help of GTFs to recognize and bind to the core promoter region of a gene.

   • Promoter Recognition: GTFs bind to specific DNA sequences within the core promoter. This binding helps position RNA polymerase II correctly for transcription initiation.

   • Mediator Complex Interaction: GTFs also interact with other proteins like the Mediator complex, which bridges the interaction between the GTFs bound to the DNA and RNA polymerase II. This coordinated interaction allows for the assembly of the pre-initiation complex, a crucial step for initiating transcription.

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   • Autumn Öğrenci

     2 yıl önce

     There are several GTFs, each with a specific role:

     • TFIID: Recognizes the TATA box, a core promoter element, and recruits other GTFs.
     • TFIIA: Stabilizes the binding of TFIID to the DNA.
     • TFIIB: Facilitates the binding of RNA polymerase II to the promoter complex.
     • TFIIE: Helps in the release of RNA polymerase II from the promoter after transcription initiation.
     • TFIIF: Stimulates RNA polymerase II to begin RNA synthesis.

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     • Autumn Öğrenci

       2 yıl önce

       While some promoters might have additional regulatory elements that influence their activity, the core function of GTFs remains essential for all promoters transcribed by RNA polymerase II in eukaryotes.

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