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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Antibody Structure01:10

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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
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Antibody-Antigen Epitope Mapping by X-Ray Crystallography.

Andrew Manion1, Teresa M Brooks1, Cory L Brooks2

  • 1Department of Chemistry and Biochemistry, California State University Fresno, Fresno, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|July 2, 2025
PubMed
Summary

X-ray crystallography provides a detailed view of antibody-antigen interactions, crucial for understanding biologic drugs and designing vaccines. This method enables precise epitope mapping for antibody engineering and mechanism of action studies.

Keywords:
Epitope mappingFabMonoclonal antibodyStructural biologyTherapeutic antibodyVaccineX-ray crystallography

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Area of Science:

  • Structural Biology
  • Immunology
  • Biochemistry

Background:

  • Antibodies are vital biologic drugs, necessitating a deep molecular understanding of their interactions.
  • Epitope mapping data is essential for antibody engineering, drug mechanism elucidation, and vaccine development.

Purpose of the Study:

  • To describe a detailed procedure for epitope mapping using X-ray crystallography.
  • To highlight the utility of X-ray crystallography as the gold standard for antibody-antigen interaction analysis.

Main Methods:

  • Production of antibody fragment (Fab) using transient transfection in expiCHO cells.
  • Expression and purification of protein antigens in E. coli.
  • Purification of the Fab-antigen complex via size exclusion chromatography followed by crystallization.

Main Results:

  • Generation of high-resolution X-ray structures of antibody-antigen complexes.
  • Detailed visualization of specific antibody-antigen interactions, including conformational epitopes.
  • Successful epitope mapping providing a comprehensive understanding of the interaction.

Conclusions:

  • X-ray crystallography is a powerful technique for precise epitope mapping.
  • The described method facilitates structure determination and epitope mapping for diverse antibody-antigen systems.
  • This approach significantly advances antibody engineering, drug discovery, and vaccine design.