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Related Concept Videos

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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Leaky Scanning02:28

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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...
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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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Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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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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Viruses with RNA Genomes01:29

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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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Intracellular Movement of Viruses and Bacteria01:10

Intracellular Movement of Viruses and Bacteria

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Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
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Flavivirus structural heterogeneity: implications for cell entry.

Félix A Rey1, Karin Stiasny2, Franz X Heinz2

  • 1Structural Virology Unit, Virology Department, Institut Pasteur, 25-28 rue du Dr Roux, 75015 Paris, France; CNRS UMR 3569, 25-28 rue du Dr Roux, 75015 Paris, France.

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Flaviviruses like Zika virus pose a significant threat. Their complex structure and particle heterogeneity may explain their broad host-range and tissue tropism, impacting human health.

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Area of Science:

  • Virology
  • Structural Biology
  • Infectious Diseases

Background:

  • Flaviviruses, including Zika virus, are a major public health concern.
  • High-resolution structures of flaviviruses reveal complex icosahedral organizations.
  • Proteolytic maturation is incomplete, leading to heterogeneous viral particles.

Purpose of the Study:

  • To explore the structural heterogeneity of flaviviruses.
  • To understand the role of particle dynamics in viral behavior.
  • To investigate how heterogeneity contributes to host-range and tropism.

Main Methods:

  • Analysis of high-resolution viral structures.
  • Characterization of immature and mature virion organizations.
  • Investigation of viral envelope glycoprotein dynamics.

Main Results:

  • Flaviviruses exhibit diverse icosahedral organizations.
  • Incomplete maturation generates heterogeneous mosaic particles.
  • Dynamic viral glycoproteins create variable surface interaction sites.

Conclusions:

  • Viral particle heterogeneity and glycoprotein dynamics influence receptor interactions.
  • This heterogeneity may explain the broad host-range and tissue tropism of flaviviruses.
  • Understanding particle clouds is crucial for comprehending Zika virus outbreaks and flavivirus emergence.