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Related Concept Videos

Antibody Structure and Classes01:25

Antibody Structure and Classes

9.7K
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.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.
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Antibody Structure01:10

Antibody Structure

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Overview
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.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
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Antibody Actions01:26

Antibody Actions

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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.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

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Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
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Related Experiment Video

Updated: Mar 3, 2026

Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads
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Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads

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Signaling by Antibodies: Recent Progress.

Stylianos Bournazos1, Taia T Wang1, Rony Dahan1

  • 1Laboratory of Molecular Genetics and Immunology, The Rockefeller University, New York 10065;

Annual Review of Immunology
|April 28, 2017
PubMed
Summary

Immunoglobulin G (IgG) antibodies link antigen recognition to immune signaling through Fc receptors. Balanced IgG-Fc receptor interactions are crucial for regulating immunity, inflammation, and disease susceptibility.

Keywords:
Fc receptorsIgGeffector functionimmunityimmunomodulationinflammation

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Last Updated: Mar 3, 2026

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Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Immunoglobulin G (IgG) antibodies possess dual functionality: antigen binding via Fab domains and signal transduction through Fc-Fc receptor interactions.
  • Effective immune responses rely on a delicate balance of IgG signaling mediated by type I and type II Fc receptors.
  • Dysregulation in IgG signaling contributes to inflammatory conditions, autoimmune diseases, and altered susceptibility to infections.

Purpose of the Study:

  • To review the intricate mechanisms governing IgG-Fc receptor interactions.
  • To highlight the diverse effector functions mediated by Fc receptors.
  • To elucidate the role of IgG signaling in immunity, inflammation, infection, autoimmunity, and therapeutic responses.

Main Methods:

  • This review synthesizes existing research on IgG-Fc receptor interactions.
  • It analyzes the molecular basis of signal transduction pathways.
  • It discusses the functional outcomes of these interactions in various physiological and pathological contexts.

Main Results:

  • IgG-Fc receptor interactions are central to a wide array of immune functions.
  • Balanced signaling is essential for controlling pro-inflammatory, anti-inflammatory, and immunomodulatory processes.
  • These interactions significantly influence susceptibility to infections and autoimmunity.

Conclusions:

  • Understanding IgG-Fc receptor mechanisms is key to comprehending immune regulation.
  • Targeting these interactions holds potential for novel therapeutic and vaccine strategies.
  • Further research into IgG signaling pathways can inform treatments for autoimmune and inflammatory diseases.