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Antibody Actions01:26

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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
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Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
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Structural basis for neutralizing antibody binding to pertussis toxin.

Jory A Goldsmith1, Annalee W Nguyen2, Rebecca E Wilen2

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Structural analysis of pertussis toxin (PT) reveals key neutralizing epitopes. This research defines how antibodies block PT binding and activity, aiding the development of improved pertussis vaccines.

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Area of Science:

  • Immunology
  • Structural Biology
  • Microbiology

Background:

  • Pertussis toxin (PT) is crucial for immunity against *Bordetella pertussis*.
  • Understanding PT-neutralizing epitopes is vital for vaccine development.
  • Previous structural characterization of these epitopes was lacking.

Purpose of the Study:

  • To structurally define neutralizing epitopes on PT.
  • To identify key structural elements for PT antigen design.
  • To elucidate the mechanisms of action for neutralizing antibodies.

Main Methods:

  • Cryoelectron microscopy (cryo-EM) at 3.6 Å resolution.
  • Determination of PT (genetically detoxified form, PTg) bound to neutralizing antibodies (hu11E6 and hu1B7).
  • Glycan array analysis, ELISA, and T cell activation assays.

Main Results:

  • Structural determination of PTg bound to hu11E6 and hu1B7 antibodies.
  • Hu11E6 targets a conserved epitope on S2/S3 subunits, blocking toxin adhesion to sialylated receptors.
  • Hu1B7 targets a quaternary epitope on S1/S5 subunits, with S5 binding not essential for neutralization.

Conclusions:

  • Structurally defined neutralizing epitopes on PT.
  • Improved molecular understanding of immune protection against *B. pertussis*.
  • Provides critical information for designing future PT-based immunogens.