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Related Concept Videos

Antibody Structure01:10

Antibody Structure

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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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Antibody Structure and Classes01:25

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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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Protein-protein Interfaces02:04

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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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
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Universal paratope-epitope interaction patterns in antibody-antigen structures.

Marta A S Perez1,2, Vincent Zoete1,2

  • 1Ludwig Institute for Cancer Research, Lausanne Branch, Department of Oncology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Agora Cancer Research Center, Lausanne, Switzerland.

Protein Science : a Publication of the Protein Society
|December 23, 2025
PubMed
Summary
This summary is machine-generated.

Researchers analyzed antibody-antigen complex structures to pinpoint key amino acids in binding sites. This structural insight aids in developing better therapeutic antibodies and improving machine learning prediction tools for antibody development.

Keywords:
antibodyantigenepitopemolecular interactionsparatope

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Area of Science:

  • Structural Biology
  • Immunology
  • Computational Biology

Background:

  • Antibody-antigen (Ab-Ag) interactions are crucial for immune defense and therapeutic antibody development.
  • Predicting and understanding these interactions at a structural level is essential for designing effective treatments.

Purpose of the Study:

  • To conduct a comprehensive structural analysis of Ab-Ag complexes.
  • To identify key amino acids (AAs) and their positions within the paratope-epitope interface.
  • To standardize interaction patterns for broader use in antibody development, particularly with machine learning.

Main Methods:

  • Extensive structural analysis of a large, non-redundant 3D database of Ab-Ag complexes.
  • Examination of amino acids at each complementarity-determining region (CDR) position.
  • Standardization of identified paratope-epitope interaction patterns.

Main Results:

  • Identification of critical amino acids and their specific positions within the Ab-Ag binding interface.
  • Demonstration that AA interaction frequencies vary significantly by CDR position.
  • Development of a standardized format for interaction data.

Conclusions:

  • The study provides crucial insights into optimizing antibody binding through targeted refinement of CDR loops.
  • Findings support the development of more accurate and reliable Ab-Ag interaction prediction tools.
  • Standardized data facilitates machine learning applications in therapeutic antibody design.