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Related Concept Videos

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Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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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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Related Experiment Video

Updated: May 30, 2026

Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells
13:07

Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells

Published on: January 30, 2019

HIV-1 reverse transcriptase dissociates during strand transfer.

John M Muchiri1, Sean T Rigby, Laura A Nguyen

  • 1Department of Microbiology and Immunology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA.

Journal of Molecular Biology
|August 9, 2011
PubMed
Summary
This summary is machine-generated.

Human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) dissociates during strand transfer, a key step in viral replication. This dissociation is essential for the template exchange mechanism, independent of RNase H activity.

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Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
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Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells
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Published on: January 30, 2019

Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors
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Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
05:46

Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

Published on: April 9, 2014

Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Antiretroviral therapy targets human immunodeficiency virus type 1 (HIV-1) replication steps unique to the virus.
  • Strand transfer, mediated by viral reverse transcriptase (RT), involves moving the synthesized DNA strand between RNA template positions.
  • Understanding if RT directly mediates or dissociates during strand transfer is crucial for drug development.

Purpose of the Study:

  • To elucidate the mechanism of strand transfer by HIV-1 reverse transcriptase (RT).
  • To determine whether RT dissociates during template exchange or directly mediates it.
  • To investigate the role of RNase H activity and nucleocapsid protein in this process.

Main Methods:

  • Developed a primer-template system enabling strand transfer without ribonuclease H (RNase H) activity.
  • Utilized an RNase H-negative mutant RT to assess the necessity of RNase H.
  • Employed a polymer trap to sequester non-polymerizing RT and evaluated strand transfer efficiency.

Main Results:

  • A polymer trap successfully inhibited strand transfer even with an RNase H-negative RT, confirming RT dissociation.
  • HIV-1 nucleocapsid protein showed minimal impact on the dissociation during strand transfer.
  • Both wild-type and RT inhibitor-resistant HIV-1 RT variants demonstrated inability to transfer with the trapping polymer, suggesting conserved dissociation.

Conclusions:

  • HIV-1 reverse transcriptase (RT) dissociates from the template during the strand transfer process.
  • This dissociation is independent of RNase H activity and is a conserved feature across different RT variants.
  • Findings provide insights into HIV-1 replication mechanisms, potentially informing the design of novel antiretroviral therapies.