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Related Concept Videos

Antibody Structure01:10

Antibody Structure

61.1K
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 Structure and Classes01:25

Antibody Structure and Classes

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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.
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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Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
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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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Peptide Bonds02:43

Peptide Bonds

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Protein Organization01:24

Protein Organization

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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Related Experiment Video

Updated: Sep 3, 2025

Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope
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Structural Features of Antibody-Peptide Recognition.

Jessica H Lee1, Rui Yin1,2, Gilad Ofek1,2

  • 1Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD, United States.

Frontiers in Immunology
|July 25, 2022
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Summary

Antibodies targeting linear epitopes, crucial for immunity, show varied peptide conformations. These antibody-peptide interactions have unique interface features beneficial for vaccine design.

Keywords:
antibodyimmunologylinear epitopepeptidestructure

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Area of Science:

  • Immunology
  • Structural Biology
  • Computational Biology

Background:

  • Antibody-antigen recognition is central to adaptive immunity.
  • Antibodies targeting linear epitopes are important for vaccine design and immunotherapy against viruses and pathogens.

Purpose of the Study:

  • To analyze the structural and interface features of antibody-linear peptide complexes.
  • To provide insights for computational modeling and the design of epitope-based immunogens.

Main Methods:

  • Analysis of nearly 200 high-resolution antibody-peptide complex structures from the Protein Data Bank.
  • Comparison of interface properties between antibody-peptide and antibody-protein complexes.

Main Results:

  • Antibody-bound peptides exhibit diverse conformations with limited secondary structure.
  • Antibody-peptide interfaces have smaller buried surface areas and fewer hydrogen bonds than antibody-protein interfaces.
  • Higher binding energy per interface area in antibody-peptide complexes is attributed to hydrophobic residues and shape complementarity.

Conclusions:

  • The structural characteristics of antibody-peptide complexes offer valuable data for understanding immune interactions.
  • Findings can inform the development of predictive models and the design of novel vaccines and immunotherapies.