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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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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.
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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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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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Structural Insights into Human Bocaparvoviruses.

Mario Mietzsch1, Shweta Kailasan1, Jamie Garrison1

  • 1Department of Biochemistry and Molecular Biology, Center for Structural Biology, McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, Florida, USA.

Journal of Virology
|March 24, 2017
PubMed
Summary
This summary is machine-generated.

Structural analysis of human bocaparvoviruses reveals unique features for therapeutic development. Understanding these emerging pathogens, like human bocavirus 1 (HBoV1), is crucial for new antiviral strategies.

Keywords:
HBoVcapsidcryo-EMgastrointestinal infectionhuman bocavirusesparvovirusrespiratory infection

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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
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Area of Science:

  • Virology
  • Structural Biology
  • Infectious Diseases

Background:

  • Bocaparvoviruses, including human bocavirus 1 (HBoV1), are emerging pathogens causing severe respiratory and gastrointestinal infections, particularly in children.
  • Lack of treatments and vaccines necessitates molecular and structural studies for therapeutic development.
  • HBoV1, HBoV3, and HBoV4 exhibit distinct tissue tropisms, highlighting the need to understand their structural basis.

Purpose of the Study:

  • Determine the high-resolution capsid structures of HBoV1, HBoV3, and HBoV4 using cryo-electron microscopy.
  • Compare these structures to other parvoviruses to identify conserved and unique features.
  • Provide a structural framework for understanding host/tissue tropism, pathogenicity, and antigenicity for developing antiviral strategies.

Main Methods:

  • Cryo-electron microscopy and three-dimensional image reconstruction were employed.
  • Capsid structures of HBoV1, HBoV3, and HBoV4 were determined to 2.8–3.0 Å resolution.
  • Structural comparisons were made at strain and genus levels with other parvoviruses.

Main Results:

  • Bocaparvovirus capsids share common parvovirus features but possess unique densities extending into the capsid interior via the 5-fold channel, suggesting genus-specific functions.
  • Variable regions in the major viral protein 3 create distinct capsid surface topologies.
  • Differences in surface loops were identified, correlating with known functional roles in host/tissue tropism, pathogenicity, and antigenicity.

Conclusions:

  • The determined structures provide insights into conserved bocaparvovirus-specific features and variable regions influencing unique surface topologies.
  • Structural variations likely dictate HBoV tissue tropism, receptor attachment, and antigenic reactivity.
  • This structural framework aids in characterizing HBoV determinants and designing targeted antiviral strategies and vaccines.