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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Bacterial Transcription01:53

Bacterial Transcription

RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Transcription Initiation01:47

Transcription Initiation

Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...

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Related Experiment Video

Updated: Jun 10, 2026

High-throughput Purification of Affinity-tagged Recombinant Proteins
07:44

High-throughput Purification of Affinity-tagged Recombinant Proteins

Published on: August 26, 2012

Mechanisms for activating bacterial RNA polymerase.

Tamaswati Ghosh1, Daniel Bose, Xiaodong Zhang

  • 1Department of Life Sciences, Centre for Structural Biology, Division of Molecular Biosciences, Imperial College London, London, UK.

FEMS Microbiology Reviews
|July 16, 2010
PubMed
Summary

Gene transcription relies on RNA polymerase (RNAP) and regulatory complexes. Recent structural studies reveal mechanistic advances in bacterial transcription initiation, particularly the role of enhancer-binding proteins in activating RNAP/sigma(54) complexes.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Gene transcription is a fundamental cellular process regulated by gene regulatory complexes.
  • RNA polymerase (RNAP) enzymes are central to transcription across all life forms.
  • The initiation phase of transcription, involving complex conformational changes, remains incompletely understood.

Purpose of the Study:

  • To review recent structural studies of bacterial RNAP holoenzymes.
  • To elucidate mechanistic insights into transcription initiation.
  • To focus on the role of enhancer-binding proteins in RNAP/sigma(54) complex activation.

Main Methods:

  • Structural studies of multisubunit RNAP.
  • Biochemical analysis of transcription initiation.
  • Focus on bacterial RNAP holoenzymes (RNAP/sigma(54) and RNAP/sigma(70)).

Main Results:

  • Bacterial RNAP holoenzymes exhibit conserved mechanisms.
  • Sigma factors direct RNAP to specific promoter sites.
  • Enhancer-binding proteins, through ATP hydrolysis, are crucial for converting the RNAP/sigma(54) closed complex to an open, transcription-competent state.

Conclusions:

  • Transcription initiation is a highly regulated process.
  • Structural and biochemical studies provide key mechanistic insights.
  • Enhancer-binding proteins are critical regulators of bacterial transcription initiation.