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Related Concept Videos

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...
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...
Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
Size and Structure of Viral Genomes01:26

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...
Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...

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Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses
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Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses

Published on: December 29, 2015

Filovirus replication and transcription.

Elke Mühlberger1

  • 1Philipps University of Marburg, Institute of Virology, Hans-Meerwein-Street 2, 35043 Marburg, Germany Tel.: +49 6421 2864 525; ; muehlber@staff.unimarburg.de.

Future Virology
|October 5, 2013
PubMed
Summary
This summary is machine-generated.

Marburg and Ebola viruses, both highly pathogenic filoviruses, share similar replication and transcription strategies. However, unique differences exist in their mechanisms, including nucleocapsid formation and mRNA editing.

Keywords:
ebola virushemorrhagic fevermarburg virusnonsegmented negative-sense RNA virusesnucleocapsid complexreplicationreverse geneticstranscription

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Using Click Chemistry to Measure the Effect of Viral Infection on Host-Cell RNA Synthesis
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Area of Science:

  • Virology
  • Molecular Biology
  • RNA Virus Research

Background:

  • Filoviruses, including Marburg and Ebola viruses, are nonsegmented negative-sense RNA viruses.
  • They replicate and transcribe their RNA genomes using distinct mechanisms.
  • Understanding these processes is crucial for antiviral development.

Purpose of the Study:

  • To review current knowledge on filovirus replication and transcription.
  • To highlight the unique strategies and differences between Marburg and Ebola virus.

Main Methods:

  • Literature review of filovirus replication and transcription.
  • Comparative analysis of Marburg and Ebola virus mechanisms.

Main Results:

  • Filoviruses share a general replication/transcription strategy.
  • Significant differences observed in nucleocapsid formation, genomic replication promoter structure, transcription protein requirements, and mRNA editing between Marburg and Ebola viruses.
  • These unique properties distinguish filoviruses within the Mononegavirales order.

Conclusions:

  • Despite shared strategies, Marburg and Ebola viruses exhibit distinct replication and transcription mechanisms.
  • Further research into these differences can reveal novel therapeutic targets.