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In immunology, a linear epitope (also sequential epitope) is an epitope—a binding site on an antigen—that is recognized by antibodies by its linear sequence of (i.e. primary structure). In contrast, most antibodies recognize a conformational epitope that has a specific three-dimensional shape (tertiary structure).
An antigen is any substance that the immune system can recognize as being foreign and which provokes an immune response. Since antigens are usually proteins that are too large to bind as a whole to any receptor, only specific segments that form the antigen bind with a specific antibody. Such segments are called epitopes. Likewise, it is only the paratope of the antibody that comes in contact with the epitope.
are composed of repeating nitrogen-containing subunits called . The linear sequence of amino acids that compose a protein is called its primary structure, which typically does not present as simple line of sequential proteins (much like a knot, rather than a straight string). But, when an antigen is broken down in a lysosome, it yields small , which can be recognized through the amino acids that lie continuously in a line, and hence are called linear epitopes.
For instance, if a protein sample is boiled, treated with beta-mercaptoethanol, and run in SDS-PAGE for the Western blot, the proteins are essentially denatured and therefore cannot assume their natural three-dimensional conformations. Therefore, antibodies that recognize linear epitopes instead of conformational epitopes are chosen for immunodetection. In contrast, in immunohistochemistry where protein structure is preserved, antibodies that recognize conformational epitopes are preferred.
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