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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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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...
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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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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...
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Transcription Initiation01:47

Transcription Initiation

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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...
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Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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The Replisome03:01

The Replisome

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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Proofreading01:31

Proofreading

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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
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Related Experiment Video

Updated: May 20, 2025

Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus

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Insights in the RSV L polymerase function and structure.

Brecht Bonneux1, Martina Ceconi2, Kim Stobbelaar2

  • 1Laboratory for Microbiology, Parasitology and Hygiene, University of Antwerp, Universiteitsbaan 1, 2610, Wilrijk, Belgium; Janssen Pharmaceutica NV, Turnhoutseweg 30, Beerse, Belgium.

Antiviral Research
|March 24, 2025
PubMed
Summary

New research models the structure of the respiratory syncytial virus (RSV) large (L) protein, a key target for antiviral drugs. This structural insight could lead to new treatments for RSV and similar viral infections.

Keywords:
AlphaFold3 modelingCryo-EM structureRSV polymeraseRespiratory syncytial virus

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Area of Science:

  • Virology
  • Structural Biology
  • Drug Discovery

Background:

  • Respiratory syncytial virus (RSV) poses significant global health and economic burdens, particularly affecting vulnerable populations.
  • Existing vaccines and antibodies address prevention, but effective antiviral treatments for RSV remain a critical unmet need.

Purpose of the Study:

  • To review current knowledge of the RSV large (L) protein structure.
  • To explore the potential of the L protein as a target for novel antiviral therapies.
  • To investigate structural similarities between RSV and human metapneumovirus (hMPV) L proteins to address knowledge gaps.

Main Methods:

  • Literature review of existing RSV L protein structural data.
  • Comparative analysis of RSV and hMPV L protein sequences.
  • Computational modeling of unresolved L protein domains using AlphaFold2 and AlphaFold3.

Main Results:

  • Identification of the L protein as a crucial component of the viral polymerase complex and a promising antiviral target.
  • Modeling provided new insights into the structures of both RSV and hMPV L proteins, potentially filling structural gaps.
  • Sequence similarity between RSV and hMPV L proteins offers a strategy to understand conserved structural features.

Conclusions:

  • The study highlights the therapeutic potential of targeting the RSV L protein.
  • Computational modeling offers a viable approach to elucidate complex viral protein structures.
  • Further structural studies are warranted to validate modeling data and advance antiviral drug development for RSV and related viruses.