Abstract
Two kinds of monoclonal antibodies against HN protein of HVJ were isolated. In competitive binding assay, binding of one of these antibodies to HN protein did not inhibit binding of the other antibody to the same molecule. One of the antibodies, named HN-1 antibody, inhibited hemagglutination activity of HVJ and also blocked neuraminidase activity of the virus when fetuin and Ehrlich ascites tumor cells were used as substrates, but it did not inhibit the activity when neuramine-lactose was used as substrate. The other antibody, HN-2, did not inhibit hemagglutination activity or neuraminidase activity, but blocked HVJ-induced viral envelope-cell fusion, cell-cell fusion and hemolysis. The mechanism by which HN-2 antibody blocked the fusion process is discussed.
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