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Viral Structure00:56

Viral Structure

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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.
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Size and Structure of Viral Genomes01:26

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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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Introduction to Virus01:28

Introduction to Virus

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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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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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Nucleic Acid Structure01:25

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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Viruses of Archaea01:29

Viruses of Archaea

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Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
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Filovirus helical nucleocapsid structures.

Shangfan Hu1,2,3, Takeshi Noda1,2,3

  • 1Laboratory of Ultrastructural Virology, Institute for Life and Medical Sciences, Kyoto University, 53 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.

Microscopy (Oxford, England)
|October 15, 2022
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Summary
This summary is machine-generated.

Filoviruses like Ebola and Marburg have complex nucleocapsid structures essential for their replication. Understanding these structures reveals potential targets for new antiviral therapies against filovirus infections.

Keywords:
cryo-electron microscopyfilovirusnucleocapsidsingle-particle analysis

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Filoviruses, including Ebola and Marburg viruses, are significant human and primate pathogens causing severe hemorrhagic fever.
  • The filovirus nucleocapsid is a double-layered helical structure housing the RNA genome, crucial for viral replication.
  • Previous research has identified key proteins involved in nucleocapsid formation, but detailed structural mechanisms remain an area of active investigation.

Approach:

  • This review synthesizes recent cryo-electron microscopy studies on Ebola virus and Marburg virus nucleocapsid structures.
  • It focuses on the helical nucleoprotein (NP)-RNA complex, RNA binding, and NP-NP interactions within the nucleocapsid.
  • Comparative analysis highlights similarities and differences between Ebola and Marburg virus nucleocapsid architectures.

Key Points:

  • The nucleocapsid's inner layer comprises a helical NP-RNA complex, serving as a scaffold for outer layer proteins VP35 and VP24.
  • Structural insights reveal the molecular basis of RNA encapsidation and protein-protein interactions critical for nucleocapsid integrity.
  • Cryo-EM studies provide high-resolution views of the nucleocapsid, elucidating assembly processes.

Conclusions:

  • Structural characterization of filovirus nucleocapsids offers a deeper understanding of their assembly and function.
  • The identified structural features present potential targets for the development of novel anti-filovirus drugs.
  • Further research into these viral structures could pave the way for effective therapeutic interventions against filovirus diseases.