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A continuous sequence of more than 70 amino acids is essential for antibody binding to the dominant antigenic site of glycoprotein gp58 of human cytomegalovirus.

Institut für Klinische und Molekulare Virologie, Universität Erlangen-Nürnberg, Germany.

ABSTRACT

Antigenic domain 1 (AD-1) on glycoprotein gp58 of human cytomegalovirus was characterized in detail, using mouse and human monoclonal antibodies as well as human convalescent sera. Series of procaryotically expressed fusion proteins and synthetic peptides of various lengths were used as sources of antigen. Binding of antibodies was found to depend on a continuous sequence of more than 70 amino acids between residues 552 and 635 of gp58. The fine specificities for sequences involved in antibody binding were (i) amino acids 557 to 635 for neutralizing as well as nonneutralizing mouse monoclonal antibodies, (ii) amino acids 552 to 630 for a neutralizing human monoclonal antibody, and (iii) amino acids 557 to 630 for antibodies present in human sera. Experiments involving fragments of AD-1, presented either as procaryotically expressed fusion protein or as synthetic peptides, indicated that the intact structure was required for recognition of AD-1 by antibodies.

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