Antibody structure render
1344×768 · AVIF · CC BY 4.0
Antibodies are essential immune system proteins with a Y-shaped structure that recognizes specific antigens.
About this subject
Antibodies, also known as immunoglobulins, are glycoproteins produced by B lymphocytes in response to antigens. Their classic Y-shaped structure consists of four polypeptide chains: two heavy chains and two light chains, held together by disulfide bonds. Each arm of the Y contains an antigen-binding site, allowing highly specific recognition. The Fc region (stem) interacts with receptors on immune cells, triggering effector responses such as phagocytosis and complement activation.
There are five main classes of antibodies in mammals: IgG, IgA, IgM, IgE, and IgD, each with distinct functions. IgG, for example, is the most abundant in blood and crosses the placenta, providing passive immunity to the fetus. IgE is involved in allergic responses and defense against parasites. Antibody diversity is generated by genetic recombination mechanisms in immunoglobulin genes, enabling the organism to recognize virtually any antigen.
Studying antibody structure was crucial for developing biotechnological therapies, such as monoclonal antibodies used to treat cancer, autoimmune diseases, and viral infections. The first monoclonal antibody approved for clinical use was muromonab-CD3, in 1985. Today, antibody engineering techniques allow production of recombinant fragments like scFv and Fab, optimizing tumor penetration and reducing side effects.
Frequently Asked Questions
What is the main function of antibodies?
Antibodies recognize and neutralize pathogens like bacteria and viruses, marking them for destruction by immune cells or activating the complement system.
How are antibodies produced in the lab?
Monoclonal antibodies are produced by fusing B lymphocytes with myeloma cells, generating hybridomas that secrete identical, specific antibodies.
What does IgG stand for?
IgG stands for immunoglobulin G, the most abundant antibody class in serum, responsible for immunological memory and long-term protection.
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