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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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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...
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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...
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Viral Replication: Lysogenic Cycle01:16

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The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
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Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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A Protocol for Analyzing Hepatitis C Virus Replication
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Hepatitis C Viral Replication Complex.

Hui-Chun Li1, Chee-Hing Yang2, Shih-Yen Lo2,3

  • 1Department of Biochemistry, Tzu Chi University, Hualien 97004, Taiwan.

Viruses
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

Hepatitis C virus (HCV) RNA replication involves complex viral and cellular factors within replication organelles. Understanding these mechanisms aids in developing direct-acting antivirals (DAAs) for HCV treatment.

Keywords:
NS3 to NS5B proteinsdirect-acting antiviralshepatitis C virusreplication organelles

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Area of Science:

  • Virology
  • Molecular Biology
  • Hepatology

Background:

  • Hepatitis C virus (HCV) infection is a major global health concern.
  • HCV replication is a complex process involving viral and host factors.
  • Effective treatments, like direct-acting antivirals (DAAs), target viral replication.

Purpose of the Study:

  • To review the viral and cellular factors regulating hepatitis C virus (HCV) genomic RNA replication.
  • To summarize the direct-acting antivirals (DAAs) that target HCV replication.

Main Methods:

  • Literature review of studies on HCV replication mechanisms.
  • Analysis of viral and cellular protein roles in RNA replication.
  • Examination of direct-acting antivirals (DAAs) targeting the HCV replication complex.

Main Results:

  • HCV RNA replication occurs in replication organelles (RO) linked to ER membrane alterations.
  • Viral RNA structure, RO biogenesis, and viral/cellular proteins regulate RNA amplification.
  • DAAs targeting the replication complex have been developed based on these findings.

Conclusions:

  • Viral and cellular factors critically regulate HCV genomic RNA replication.
  • Targeting these factors with DAAs offers effective therapeutic strategies for HCV.