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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.

Gene Families

Gene Families

Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...

Globular and Fibrous Proteins

Globular and Fibrous Proteins

Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...

Protein Organization

Protein Organization

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.
The primary structure of a protein is its amino acid sequence....

Protein and Protein Structure

Protein and Protein Structure

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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Related Experiment Video

Updated: Jan 19, 2026

Optimized Negative Staining: a High-throughput Protocol for Examining Small and Asymmetric Protein Structure by Electron Microscopy

Optimized Negative Staining: a High-throughput Protocol for Examining Small and Asymmetric Protein Structure by Electron Microscopy

Published on: August 15, 2014

IgG Antibody 3D Structures and Dynamics.

Jacob White Jay¹, Brinkley Bray², Yaozhi Qi^3,4

¹Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, GA 31404, USA. Jacob.White.Jay@live.mercer.edu.

Antibodies (Basel, Switzerland)

|September 24, 2019

Summary

This summary is machine-generated.

Individual-particle electron tomography (IPET) advances antibody research by revealing dynamic structural changes. This technique enhances understanding of antibody fluctuations, crucial for developing better antibody-based therapeutics.

Keywords:

3D structure of IgG IPET antibody dynamics antibody engineering antibody structure bispecific antibody electron tomography homodimer antibody individual-particle 3D image individual-particle electron tomography single molecule 3D image structure of bispecific IgG1

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Published on: September 15, 2010

Area of Science:

Biochemistry
Structural Biology
Immunology

Background:

Antibodies are critical for human health and serve as targeted therapeutics for various diseases.
Understanding antibody dynamics is essential for improving drug development and therapeutic efficacy.
Existing methods for studying protein 3D structure have limitations in capturing antibody dynamics.

Purpose of the Study:

To review current techniques for studying antibody structures.
To highlight the advantages of individual-particle electron tomography (IPET) for characterizing antibody dynamics.
To emphasize the role of IPET in advancing antibody-based drug development.

Main Methods:

Review of existing protein structure determination techniques.
Focus on individual-particle electron tomography (IPET) for 3D structural characterization.
Analysis of IPET's capability in assessing antibody structural heterogeneity and conformational changes.

Main Results:

Current techniques have limitations in capturing the dynamic behavior of antibodies and antibody-antigen complexes.
Individual-particle electron tomography (IPET) offers a particle-by-particle approach for detailed 3D structural analysis.
IPET provides direct imaging data crucial for understanding antibody structural variety.

Conclusions:

IPET is a powerful technique for characterizing dynamic antibody structures and conformational flexibility.
The insights gained from IPET can significantly improve the engineering and clinical application of synthetic antibodies.
Advancements in studying antibody dynamics through techniques like IPET are vital for next-generation antibody therapeutics.