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Related Concept Videos

Antibody Structure01:10

Antibody Structure

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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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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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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.
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Immunoglobulin-like Cell Adhesion Molecules

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Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
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In organisms, proteins are the most abundant macromolecules. They act as the building blocks of life and play various crucial roles in the body. Proteins can be broadly classified into two distinct subtypes based on their shape and solubilities: globular proteins and fibrous proteins.
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Human α2-Macroglobulin: Architecture, Mechanisms, and Functional Implications.

Pietro de Carvalho Andrade1, Tales Alexandre Costa-Silva2, Gisele Monteiro1

  • 1Department of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|April 11, 2026
PubMed
Summary

Human alpha2-macroglobulin (hα2M), a key innate immune protein, functions as a broad protease inhibitor and transports molecules. Recent studies explore its structure, unique protease capture mechanism, and therapeutic potential.

Keywords:
alpha 2 macroglobulinmolecular mechanismsplasma proteinprotease inhibitorproteinase

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Alpha2-macroglobulin (α2M) is a major plasma glycoprotein with crucial roles in innate immunity.
  • It acts as a pan-protease inhibitor and participates in cytokine/hormone transport and cellular responses.

Purpose of the Study:

  • To review recent findings on human α2M (hα2M) structure and its protease capture mechanism.
  • To summarize 50 years of hα2M literature, including its behavior, dimeric form, and role in inflammation.

Main Methods:

  • Literature review of hα2M studies.
  • Analysis of hα2M structure-function relationships.
  • Summary of purification and storage protocols.

Main Results:

  • hα2M exhibits unique electrophoretic behavior and a dimeric structure essential for protease capture.
  • It possesses a distinct mechanism for incorporating non-proteolytic ligands.
  • Challenges in hα2M structural studies are noted.

Conclusions:

  • hα2M research is vital for understanding innate immunity, inflammation, and infection.
  • Emerging therapeutic strategies and potential links to cancer resistance highlight hα2M's translational significance.