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Antibodies bind specific antigens via paratopes in the variable regions, which recognize specific epitopes on the antigen.
An antibody (immunoglobulin) is a large immune-system protein that binds to specific antigens with high precision. Each antibody has antigen-binding sites (paratopes) located at the tips of its “Y”-shaped structure, formed by variable regions on both heavy and light chains. The paratope recognizes a particular epitope, which is a specific part of the antigen, in a lock-and-key–like interaction that allows antibodies to tag pathogens for immune attack or neutralize them directly. Antigen specificity is determined by the variable-domain hypervariable regions, especially the complementarity-determining regions (CDRs), whose shapes complement the epitope. The immune system generates vast diversity of these binding sites through mechanisms such as V(D)J recombination (creating unique variable regions) and somatic hypermutation with affinity maturation (introducing mutations that can increase or decrease binding strength). Specificity can be described in terms of how many antigens/epitopes an antibody recognizes, such as monospecific (one), bispecific (two), or polyvalent (many).
Antibodies bind specific antigens via paratopes in the variable regions, which recognize specific epitopes on the antigen.
CDRs within the variable domains largely determine antigen specificity, and diversity is generated by V(D)J recombination plus somatic hypermutation/affinity maturation.
Antibody specificity can be categorized as monospecific, bispecific, or polyvalent depending on how many antigens/epitopes are recognized.
A large immunoglobulin protein produced by the immune system that binds specific antigens to identify, tag, or neutralize them.
A molecule or structure recognized by the immune system, often found on bacteria, viruses, or infected cells.
The property of an antibody to recognize particular antigen epitopes with high precision.
The antigen-binding site on an antibody that specifically binds an epitope on an antigen.
A specific part of an antigen that is recognized by an antibody paratope.
Hypervariable loops in antibody variable domains whose shapes largely determine which epitope an antibody binds.
A genetic rearrangement process that creates unique antibody variable regions, generating diverse paratopes and antigen specificities.
A process in activated B cells that introduces point mutations into antibody variable-region genes to diversify binding properties.
The selection-driven process that increases the average binding affinity of antibodies for their antigen over time.
Describes an antibody that has specificity for a single antigen or epitope.
Describes an antibody that can bind two different antigens or two different epitopes on the same antigen.
Describes a group of antibodies that can bind many different antigens or microorganisms.
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