---
title: "Transcription initiation: promoters, general factors and polymerase recruitment"
description: "RNA polymerase II uses general transcription factors to initiate at a promoter. Recruitment, opening and promoter escape can regulate RNA production, alongside control during elongation."
canonical: https://lightmysky.com/learn/science/transcription-initiation-promoters-general-factors-and-polymerase-recruitment-mt_0Ky-pYgh0Y
source: https://lightmysky.com/learn/science/transcription-initiation-promoters-general-factors-and-polymerase-recruitment-mt_0Ky-pYgh0Y.md
retrieved: 2026-11-12
---

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# Transcription initiation: promoters, general factors and polymerase recruitment

RNA polymerase II uses general transcription factors to initiate at a promoter. Recruitment, opening and promoter escape can regulate RNA production, alongside control during elongation.

Subject: Science · Area: Biochemistry & Molecular Biology · Ages 19 to 21
Page: https://lightmysky.com/learn/science/transcription-initiation-promoters-general-factors-and-polymerase-recruitment-mt_0Ky-pYgh0Y

## Ready when they can

- Describes a model assembly pathway at a TATA-containing polymerase II promoter and explains promoter escape.
- Explains how initiation control limits new RNA synthesis while recognising regulation during elongation.
- Contrasts bacterial sigma-assisted initiation with polymerase II general-factor assembly.

## Lesson: Assemble first, then read

In homologous repair, a donor DNA sequence guides DNA synthesis. In transcription, a gene's template DNA guides RNA synthesis. RNA polymerase II makes pre-mRNA with general transcription factors. In a model TATA-containing promoter, TBP within TFIID binds TATA. TFIIA and TFIIB help organise the complex. Polymerase II joins with TFIIF, then TFIIE and TFIIH join. Many promoters lack TATA, and assembly need not follow this exact order.

TFIIH helps open promoter DNA through ATP-driven DNA translocation. Its kinase phosphorylates the polymerase's C-terminal domain, or CTD, supporting the transition out of initiation. During promoter escape, polymerase releases initiation contacts and moves away from the promoter. Later pausing or termination can still occur. Loss of TFIIH kinase activity can impair productive transcription without proving that all RNA synthesis stops.

Activators can recruit or stabilise initiation machinery; repressors can hinder it. Reducing initiation avoids starting unnecessary RNA chains, but does not remove existing mRNA. Elongation is also regulated. Polymerase can pause near a promoter and resume after pause release. Pausing differs from termination: a pause need not discard the RNA or jam the template.

In bacteria, sigma associates with core RNA polymerase and helps recognise promoters. Many promoters used by the main sigma factor have minus 10 and minus 35 elements. Bacteria use different sigma factors and other regulators. Polymerase II instead uses its general-factor complex. Neither system's regulation is limited to initial promoter binding.

**Recap.** General factors help polymerase II initiate. Promoter opening, escape and later elongation control affect productive RNA synthesis.

*Lesson, questions and flashcards written for this dataset.*

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Homologous Recombination and Double-Strand Break Repair](https://lightmysky.com/learn/science/homologous-recombination-and-double-strand-break-repair-mt_yWlwqAsXEf)

## Optional connections

- [Transcription and RNA Splicing in Eukaryotes](https://lightmysky.com/learn/science/transcription-and-rna-splicing-in-eukaryotes-mt_j2vc70vH5t)

## Opens up

- [Enhancers, accessibility and combinatorial control](https://lightmysky.com/learn/science/enhancers-accessibility-and-combinatorial-control-mt_BTMCj6V6jD)
- [Sleep, Circadian Rhythms and the Clock in the Brain](https://lightmysky.com/learn/science/sleep-circadian-rhythms-and-the-clock-in-the-brain-mt_cXx4SaLJUM)
- [Operon Logic: Induction, Repression and Feedback on Transcription](https://lightmysky.com/learn/science/operon-logic-induction-repression-and-feedback-on-transcription-mt_yNvJjGMSJQ)