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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

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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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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As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
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Retrovirus Life Cycles01:10

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
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Related Experiment Video

Updated: Jul 7, 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

Murine leukemia virus reverse transcriptase: structural comparison with HIV-1 reverse transcriptase.

Marie L Coté1, Monica J Roth

  • 1Department of Biochemistry, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, 675 Hoes Lane, Piscataway, NJ 08854, United States.

Virus Research
|February 26, 2008
PubMed
Summary
This summary is machine-generated.

New X-ray structures enable detailed comparisons between Moloney murine leukemia virus reverse transcriptase (MoMLV RT) and HIV-1 RT. This structural analysis reveals key similarities and differences, informing new models for MoMLV RT function.

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Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites

Published on: March 22, 2016

Area of Science:

  • Structural Biology
  • Virology
  • Enzymology

Background:

  • Previous biochemical studies and sequence homologies provided a foundation for understanding Moloney murine leukemia virus reverse transcriptase (MoMLV RT).
  • Prior crystal structures of MoMLV RT subdomains illuminated its polymerization function.

Purpose of the Study:

  • To conduct detailed structure/function comparisons between MoMLV RT and HIV-1 RT using recent X-ray crystal structure data.
  • To critically elucidate similarities and differences between these two reverse transcriptases.
  • To propose working models for MoMLV RT based on comprehensive structural analysis.

Main Methods:

  • Analysis of recent X-ray crystal structures of MoMLV RT.
  • Comparative structural analysis with existing HIV-1 RT structures.
  • Integration of prior biochemical and sequence homology data.

Main Results:

  • New structural information allows for a more intricate examination of the entire MoMLV RT enzyme.
  • Detailed structural comparisons with HIV-1 RT are now possible, leading to critical elucidation of their relationship.
  • Identification of key structural similarities and differences between MoMLV RT and HIV-1 RT.

Conclusions:

  • Recent structural data significantly enhances the ability to compare MoMLV RT and HIV-1 RT.
  • Proposed working models for MoMLV RT are informed by this detailed structural analysis.
  • The findings provide a refined understanding of retroviral reverse transcriptase structure and function.