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Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
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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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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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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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SARS-CoV-2 Assembly: Gaining Infectivity and Beyond.

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  • 1Lady Davis Institute, Jewish General Hospital, Montreal, QC H3T 1E2, Canada.

Viruses
|November 27, 2024
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Summary

This review details severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) replication, focusing on viral assembly and progeny egress. Understanding these processes reveals SARS-CoV-2 vulnerabilities for developing new antiviral therapies.

Keywords:
SARS-CoV-2structural proteinsviral assemblyvirus–host interactions

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) caused the COVID-19 pandemic.
  • Research has focused on viral entry and spike protein, but later replication stages are less understood.
  • Viral assembly and progeny egress are critical for infectious virus production and immune evasion.

Purpose of the Study:

  • To provide an updated summary of SARS-CoV-2 structural proteins' roles in viral assembly.
  • To explore the regulation of viral assembly by viral and cellular factors.
  • To examine cellular mechanisms that restrict SARS-CoV-2 assembly.

Main Methods:

  • Literature review of recent research on SARS-CoV-2 replication.
  • Analysis of viral and cellular protein interactions during assembly.
  • Investigation of host-pathogen interactions in viral egress.

Main Results:

  • SARS-CoV-2 structural proteins are crucial for orchestrating viral assembly.
  • Viral assembly is regulated by a complex interplay of viral and host cell factors.
  • The virus employs strategies to evade cellular mechanisms that inhibit assembly.

Conclusions:

  • Understanding SARS-CoV-2 assembly and egress highlights viral vulnerabilities.
  • This knowledge is essential for developing effective antiviral therapeutics against SARS-CoV-2.
  • Targeting later replication stages may offer new avenues for treatment.