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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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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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Structural analysis of human bocaviruses (HBoVs) reveals key antigenic sites on their capsids. This research identifies potential targets for developing new vaccines and antiviral strategies against these emerging pediatric pathogens.

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Area of Science:

  • Structural biology
  • Virology
  • Immunology

Background:

  • Human bocaviruses (HBoVs) are emerging pathogens causing respiratory and gastrointestinal infections in children.
  • No current treatments or vaccines exist, necessitating research into HBoV molecular and structural mechanisms for control strategies.
  • The parvovirus capsid contains crucial determinants for viral tropism, pathogenicity, and antigenicity, yet these are poorly understood for HBoVs.

Purpose of the Study:

  • To determine the structures of human bocavirus (HBoV) monoclonal antibody (MAb) fragment complexes.
  • To identify strain-specific and cross-reactive antigenic epitopes on HBoV capsids.
  • To provide structural insights for developing HBoV vaccines and gene therapy vectors.

Main Methods:

  • Cryo-electron microscopy and 3D image reconstruction were used to determine the structures of six HBoV MAb fragment complexes.
  • Pseudoatomic modeling was employed to map MAb footprints onto the HBoV capsid surfaces.
  • Analysis focused on conserved and variable regions of the capsid, including DE and HI loops and surface walls.

Main Results:

  • Structures were determined for HBoV1, HBoV2, and HBoV4 in complex with various MAbs.
  • One MAb (15C6) showed cross-reactivity with HBoV1, HBoV2, and HBoV4, binding to conserved DE and HI loops.
  • Three MAbs (4C2, 12C1, 9G12) were specific to HBoV1, binding to surface loops of the 2-/5-fold wall and 3-fold protrusions.
  • The study identified the conserved parvovirus DE loop at the 5-fold axis as a novel antigenic determinant.

Conclusions:

  • The identified MAb footprints highlight conserved and strain-specific regions on HBoV capsids.
  • These epitopes are potential targets for developing effective peptide vaccines against HBoVs.
  • Structural knowledge of HBoV antigenicity aids in understanding virus-host interactions and developing therapeutic strategies, including gene delivery for cystic fibrosis.