Molecular basis of antigen mimicry by an anti-idiotope

Nature
B A FieldsR A Mariuzza

Abstract

Idiotopes are antigenic determinants, unique to an antibody or group of antibodies, defined by the reaction of anti-idiotopic antibodies with the antibodies bearing the idiotopes. The ensemble of idiotopes of an antibody constitutes its idiotype. Idiotypes are useful as markers to follow specific antibodies and clones of cells in immune responses and the inheritance of immunoglobulin genes. As external antigens and anti-idiotypic antibodies can competitively bind the combining site of specific antibodies, some anti-idiotypic antibodies may resemble the external antigen, thus mimicking its structure. It has been proposed that an anti-idiotypic antibody, anti-anti-X, may resemble the external antigen X and thus carry its 'internal image', but this idea is not unequivocally supported by the three-dimensional structures of anti-idiotopic antibodies, either because the structures of the external antigen or of the anti-idiotopic antibody were unknown, or because the anti-idiotopic antibodies showed no resemblance to the external antigens (reviewed in ref. 10). Functional mimicry of ligands of biological receptors by anti-idiotypic antibodies has been described in several systems (reviewed in ref. 11). But how closely can antibodies m...Continue Reading

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