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Cloning and Characterization of cDNA Clones Corresponding to Transcripts from the BamHI G Region of the Epstein-Barr Virus Genome and Expression of BGLF2

¹ Graduate Institute of Microbiology
and² Graduate Institute of Medical Technology, College of Medicine, National Taiwan University, Taipei, Taiwan, Republic of China

A cDNA library was constructed from poly(A)⁺ RNA isolated from the iododeoxyuridine-treated P3HR1 cell line. Five cDNA clones, which hybridized with the BamHI G fragment of Epstein-Barr virus (EBV) DNA, were subcloned and sequenced. Clones G2, G3 and G4 corresponded to the BGLF2 open reading frame (ORF) of EBV (B95-8, nucleotides 126 837 to 125 866); G3 was found to contain the entire BGLF2 ORF. The predicted M_r of the putative protein product of the EBV B95-8 BGLF2 ORF is 36K. Complete nucleotide sequencing of G3 revealed that there were two nucleotide changes from the reported sequence of the EBV B95-8 BGLF2 gene, but these did not alter the predicted amino acid sequence of the products. Clone G3 and a cDNA derived from it by N-terminal deletion were expressed in Escherichia coli, producing fusion proteins. Rabbit antisera against these proteins were shown to react with viral capsid antigen-expressing HR1 cells in an indirect immunofluorescence assay. In vitro transcription/translation products and fusion proteins expressed in E. coli were used to determine the presence of antibodies in sera from EBV-infected individuals. The results of immunoprecipitation and immunoblotting studies showed that the majority of EBV-seropositive individuals mount a serum antibody response to the BGLF2 ORF-encoded protein.

Received 22 April 1991; accepted 6 August 1991.

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