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In this study we tried to elucidate further the crossreactivity pattern and binding characteristics of human monoclonal IgM DJ which is an anti-DNA antibody and possesses Y7 natural idiotope. Isolated IgM DJ and its enzymatically obtained fragments (Fab ' and (Fab ' 2) were tested for binding to more than 26 antigens and nine bacteria in indirect ELISA. Inhibition of binding studies and examination of the stability of antigen-antibody complexes were also done in ELISA assay. IgM DJ bound to single stranded DNA and human lactic acid bacteria, such as {\it L. acidophyllus, B. bifidum} and {\it L. plantarum}. This binding was shown to be mediated through IgM DJ Fab ' fragment. High avidity and low affinity of interactions was estimated from the binding curves of Fab ' , (Fab ' )2 fragments and whole IgM. The common epitopic motif on both antigens were negatively charged phosphodiester moieties. Complexes formed with ssDNA and {\it B. bifidum} were resistant to washing with high salt. This suggested that electrostatic attraction was not a strong component of the binding. A novel pattern of natural autoantibody reactivity in a human system related to cross-reactivity with DNA and LAB is described. Possible involvement of LAB in induction of natural anti-DNA antibodies is discussed.
Human Antibodies – IOS Press
Published: Jan 1, 1999
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