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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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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.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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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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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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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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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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Related Experiment Video

Updated: Oct 11, 2025

Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
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Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle

Published on: February 1, 2017

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The hepatitis B virus polymerase.

Daniel N Clark1, Razia Tajwar2, Jianming Hu3

  • 1Department of Microbiology, Weber State University, Ogden, UT, United States.

The Enzymes
|December 4, 2021
PubMed
Summary
This summary is machine-generated.

Hepatitis B virus polymerase (P) protein drives viral replication through reverse transcription. Understanding P

Keywords:
EnzymologyHepatitis B virusPolymeraseProtein-primingReverse transcriptionRibonuclease H

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Author Spotlight: Advancements and Challenges in Hepatitis B Virus Detection
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A Competent Hepatocyte Model Examining Hepatitis B Virus Entry through Sodium Taurocholate Cotransporting Polypeptide as a Therapeutic Target
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A Competent Hepatocyte Model Examining Hepatitis B Virus Entry through Sodium Taurocholate Cotransporting Polypeptide as a Therapeutic Target

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Related Experiment Videos

Last Updated: Oct 11, 2025

Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle
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Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle

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Author Spotlight: Advancements and Challenges in Hepatitis B Virus Detection
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A Competent Hepatocyte Model Examining Hepatitis B Virus Entry through Sodium Taurocholate Cotransporting Polypeptide as a Therapeutic Target
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A Competent Hepatocyte Model Examining Hepatitis B Virus Entry through Sodium Taurocholate Cotransporting Polypeptide as a Therapeutic Target

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Area of Science:

  • Hepatitis B virus (HBV) research
  • Molecular virology
  • Enzymology

Background:

  • Hepatitis B virus (HBV) causes chronic liver disease and cancer.
  • HBV replication relies on the multifunctional polymerase (P) protein.
  • P protein exhibits protein-priming, reverse transcriptase, and ribonuclease H activities.

Purpose of the Study:

  • To elucidate the enzymology and structure of the HBV P protein.
  • To address the technical challenges hindering HBV P protein research.
  • To improve understanding of HBV reverse transcription and inform therapeutic strategies.

Main Methods:

  • Enzymatic assays to characterize P protein activities.
  • Structural biology techniques (e.g., X-ray crystallography, cryo-EM) to determine P protein structure.
  • Biochemical studies to investigate P protein interactions and mechanisms.

Main Results:

  • Detailed characterization of HBV P protein's enzymatic functions.
  • Insights into the structural basis of HBV reverse transcription.
  • Identification of potential targets for novel antiviral drug development.

Conclusions:

  • A deeper understanding of HBV P protein is crucial for developing effective HBV therapies.
  • Studying HBV P protein expands knowledge of diverse reverse-transcribing elements.
  • Improved HBV treatment strategies can result from enhanced P protein knowledge.