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An epitope, also known as antigenic determinant, is the part of an antigen that is recognized by the immune system, specifically by antibodies, B cells, or T cells. The part of an antibody that binds to the epitope is called a paratope .
In immunology, a paratope, also known as an antigen-binding site, is the part of an antibody which recognizes and binds to an antigen. [ 1 ] [ 2 ] It is a small region at the tip of the antibody's antigen-binding fragment and contains parts of the antibody's heavy and light chains .
In immunology, epitope mapping is the process of experimentally identifying the binding site, or epitope, of an antibody on its target antigen (usually, on a protein). [ 1 ] [ 2 ] [ 3 ] Identification and characterization of antibody binding sites aid in the discovery and development of new therapeutics , vaccines , and diagnostics .
Antibody-antigen interactions are highly specific and those that have high affinity will interact with increased bond strength and trigger downstream immune responses. The strength of the bond between the epitope of the antigen and the paratope of the antibody will determine the affinity of the interaction. [1]
HV3 is the most variable part. Thus these regions may be part of a paratope, the part of an antibody that recognizes and binds to an antigen. The rest of the V region between the hypervariable regions are called framework regions. Each V domain has four framework domains, namely FR1, FR2, FR3, and FR4. [4] [6]
An epitope that can be attacked by many different B cells is said to be highly immunogenic. In these cases, the binding affinities for respective epitope-paratope pairs vary, with some B cell clones producing antibodies that bind strongly to the epitope, and others producing antibodies that bind weakly. [1]
Up to 10% of patients with rheumatoid arthritis are at risk of sudden death due to unrecognized cord compression. [2] Thus surgical intervention is a reasonable choice in the presence of a neurologic deficit as a result of instability. In fact, early surgery for atlantoaxial subluxation may actually delay the debilitating progress of myelopathy ...
Antibody opsonization is a process by which a pathogen is marked for phagocytosis through coating of a target cell with antibodies. Immunoglobulins participate in molecular tagging of pathogens which display antigens recognised by their specific paratope.
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