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Antibody Actions

Antibody Actions

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...

Antibody Structure

Antibody Structure

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...

Antibody Structure and Classes

Antibody Structure and Classes

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.

Hybridoma Technology

Hybridoma Technology

Hybridoma technology is used for the large-scale production of monoclonal antibodies. Monoclonal antibodies bind to only a single antigenic determinant or epitope. Such antibodies are used in research, diagnostics, and disease therapy. The hybridoma technology established in 1975 by Georges Köhler and Cesar Milstein was awarded the Nobel Prize in Medicine in 1984 for revolutionizing research and therapy.
Hybridoma Selection
Commonly used fusion techniques — electroporation, polyethylene glycol...

Conjugated Proteins

Conjugated Proteins

Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...

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Related Experiment Video

Updated: Jul 7, 2026

Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting

Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting

Published on: March 8, 2018

Antibody conjugates for cell biology.

¹Molecular Probes, Inc., Eugene, Oregon, USA.

Current Protocols in Cell Biology

|January 30, 2008

Summary

This study details simple, successful antibody conjugation protocols using amine labeling for creating fluorescent, biotin, or enzyme-linked reagents. These methods yield active conjugates for biological research and diagnostics.

Area of Science:

Biochemistry
Molecular Biology
Immunology

Background:

Antibody conjugates are essential tools in biological and chemical research for molecule detection.
Existing conjugation methods require optimization for specific applications and antibody quantities.

Purpose of the Study:

To present basic, high-success protocols for antibody conjugation.
To provide methods for labeling antibodies with fluorescent dyes, biotin, and enzymes.
To offer variations for limited antibody quantities and concentration estimation.

Main Methods:

Antibody conjugation via derivatization of amino groups.
Utilizing fluorescent dyes, biotin, or enzyme derivatives for labeling.
Implementing variations for small antibody amounts and concentration assays.

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Genetic Encoding of a Non-Canonical Amino Acid for the Generation of Antibody-Drug Conjugates Through a Fast Bioorthogonal Reaction

Genetic Encoding of a Non-Canonical Amino Acid for the Generation of Antibody-Drug Conjugates Through a Fast Bioorthogonal Reaction

Published on: September 14, 2018

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

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

Published on: September 15, 2016

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Last Updated: Jul 7, 2026

Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting

Initial Evaluation of Antibody-conjugates Modified with Viral-derived Peptides for Increasing Cellular Accumulation and Improving Tumor Targeting

Published on: March 8, 2018

Genetic Encoding of a Non-Canonical Amino Acid for the Generation of Antibody-Drug Conjugates Through a Fast Bioorthogonal Reaction

Genetic Encoding of a Non-Canonical Amino Acid for the Generation of Antibody-Drug Conjugates Through a Fast Bioorthogonal Reaction

Published on: September 14, 2018

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

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

Published on: September 15, 2016

Main Results:

Developed easy-to-perform conjugation protocols with high success rates.
Generated brightly fluorescent antibody conjugates that retain high biological activity.
Demonstrated the effectiveness of amine labeling as a widely used commercial method.

Conclusions:

The presented antibody conjugation protocols are reliable and versatile.
Amine-based labeling is an effective strategy for creating active antibody conjugates.
These methods support diverse applications in biological research and diagnostics.