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Related Concept Videos

Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
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...
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...
Viruses of Archaea01:29

Viruses of Archaea

Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...

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Related Experiment Video

Updated: Jul 13, 2026

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

High-throughput Purification of Affinity-tagged Recombinant Proteins

Published on: August 26, 2012

Structure and function of archaeal RNA polymerases.

Finn Werner1

  • 1University College London, Department of Biochemistry and Molecular Biology, Darwin Building, Gower Street, London WC1E 6BT, UK. werner@biochem.ucl.ac.uk

Molecular Microbiology
|August 19, 2007
PubMed
Summary

Archaeal RNA polymerases (RNAPs) are crucial enzymes similar to eukaryotic RNAPII. Detailed structural and mechanistic insights are emerging from recombinant systems, advancing our understanding of transcription.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • RNA polymerases (RNAPs) are fundamental enzymes essential for all life.
  • Archaeal RNAPs share significant similarities with eukaryotic RNAPII in structure and function.
  • Understanding RNAP mechanisms is key to deciphering gene regulation.

Purpose of the Study:

  • To detail the molecular mechanisms of archaeal RNA polymerases.
  • To leverage high-resolution structural data and recombinant systems for in-depth analysis.
  • To elucidate the roles of RNAP subunits and their interactions in transcription.

Main Methods:

  • High-resolution structural analysis of archaeal RNAPs.
  • Utilizing wholly recombinant archaeal transcription systems.
  • Investigating interactions with DNA/RNA scaffolds, NTPs, and transcription factors.

Main Results:

  • Detailed understanding of the 12-subunit archaeal RNAP structure and function.
  • Elucidation of allosteric regulation mechanisms governing RNAP activity.
  • Characterization of interactions with DNA, RNA, substrates, and transcription factors.

Conclusions:

  • Archaeal RNAPs are complex, highly regulated enzymes.
  • Structural and mechanistic insights are rapidly advancing our knowledge of transcription.
  • This research provides a foundation for understanding fundamental biological processes.