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Monoclonal antibodies (MAbs) 2D4, 2D6, and 13D6 against human herpesvirus 6 (HHV-6) variant A strain GS recognized virion envelope glycoprotein complex gp82-gp105 and neutralized the infectivity of HHV-6 variant A group isolates. A 624-bp genomic fragment (82G) was identified from an HHV-6 strain GS genomic library constructed in the lambda gt11 expression system by immunoscreening with MAb 2D6. Rabbit antibodies against the fusion protein expressed from the genomic insert recognized glycoprotein complex gp82-gp105 from HHV-6-infected cells, thus confirming that the genomic fragment is a portion of the gene(s) that encodes gp82-gp105. This genomic insert hybridized specifically with viral DNAs from HHV-6 variant A strains GS and U1101 under high-stringency conditions but hybridized with HHV-6 variant B strain Z-29 DNA only under low-stringency conditions. DNA sequence analysis of the insert revealed a 167-amino-acid single open reading frame with an open 5' end and a stop codon at the 3' end. Hybridization studies with HHV-6A strain U1102 DNA localized the gp82-gp105-encoding gene to the unique long region near the direct repeat at the right end of the genome. To locate the neutralizing epitope(s) recognized by the MAbs, a series of deletions from the 3' end of the gene were constructed with exonuclease III, and fusion proteins from deletion constructs were tested for reactivity with MAbs in a Western immunoblot assay. Sequencing of deletion constructs at the reactive-nonreactive transition point localized the epitope recognized by the three neutralizing MAbs within or near a repeat amino acid sequence (NIYFNIY) of the putative protein. This repeat sequence region is surrounded on either side by two potential N-glycosylation sites and three cysteine residues.

journal of virology

Identification and mapping of the gene encoding the glycoprotein complex gp82-gp105 of human herpesvirus 6 and mapping of the neutralizing epitope recognized by monoclonal antibodies