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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...
Viral Structure00:56

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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
Introduction to Virus01:28

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Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
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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 retrovirus to...
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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
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Published on: July 27, 2021

Bunyavirus: structure and replication.

Tom S Y Guu1, Wenjie Zheng, Yizhi J Tao

  • 1Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77005, USA.

Advances in Experimental Medicine and Biology
|February 3, 2012
PubMed
Summary
This summary is machine-generated.

Bunyaviruses are RNA viruses with complex replication strategies. This review details their unique RNA synthesis, including cap snatching and prime-and-realign mechanisms, crucial for understanding viral infection.

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Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • Bunyaviridae is a large family of negative-sense, single-stranded RNA viruses infecting diverse hosts.
  • Bunyaviruses possess a tripartite genome encoding structural proteins (Gc, Gn, N, L) and sometimes nonstructural proteins (NSs, NSm).
  • Viral entry occurs via endocytosis, with fusion in endosomes releasing genomic RNA into the cytoplasm.

Purpose of the Study:

  • To review key aspects of bunyavirus replication.
  • To discuss novel mechanisms of RNA synthesis and protein interactions.
  • To highlight recent advances in structural and functional characterization of viral components.

Main Methods:

  • Literature review of bunyavirus replication.
  • Analysis of viral entry and genome release mechanisms.
  • Discussion of RNA transcription and replication strategies.

Main Results:

  • Bunyavirus replication occurs in the cytoplasm, orchestrated by the viral polymerase L.
  • Unique mechanisms like cap snatching and prime-and-realign are essential for transcription and replication initiation.
  • Ribonucleoprotein encapsidation and translation-coupled processes are critical for viral propagation.

Conclusions:

  • Bunyavirus replication involves intricate RNA synthesis and protein-mediated regulation.
  • Understanding these mechanisms provides insights into viral pathogenesis and potential therapeutic targets.
  • Recent structural studies are crucial for elucidating the function of viral RNA synthesis machinery.