During RNA transcription, what is the first event that occurs?

During RNA transcription, what is the first event that occurs?

• A. Phosphorylation of RNA polymerase
• B. Recruitment of TFIIH
• C. Transcription initiation
• D. Capping of RNA

Answer: (B)

The first event that occurs during RNA transcription is the recruitment of TFIIH. This step is crucial because TFIIH is a multi-subunit protein complex that plays a significant role in transcription initiation. When transcription is initiated, RNA polymerase II, the enzyme responsible for synthesizing mRNA, needs to be properly activated and positioned at the start of the gene. Before RNA polymerase can begin transcribing DNA into RNA, it requires certain transcription factors to help it bind to the promoter region. Among these factors, TFIIH serves important functions, including unwinding the DNA at the transcription start site and phosphorylating the C-terminal domain of RNA polymerase II. This phosphorylation event is essential for RNA polymerase to transition from the initiation phase to the elongation phase of transcription. In summary, the recruitment of TFIIH is a prerequisite for subsequent steps in the transcription process, making it the first critical event in RNA transcription.

The first event that occurs during RNA transcription is the recruitment of TFIIH. This step is crucial because TFIIH is a multi-subunit protein complex that plays a significant role in transcription initiation.

When transcription is initiated, RNA polymerase II, the enzyme responsible for synthesizing mRNA, needs to be properly activated and positioned at the start of the gene. Before RNA polymerase can begin transcribing DNA into RNA, it requires certain transcription factors to help it bind to the promoter region. Among these factors, TFIIH serves important functions, including unwinding the DNA at the transcription start site and phosphorylating the C-terminal domain of RNA polymerase II. This phosphorylation event is essential for RNA polymerase to transition from the initiation phase to the elongation phase of transcription.

In summary, the recruitment of TFIIH is a prerequisite for subsequent steps in the transcription process, making it the first critical event in RNA transcription.