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Immunological studies on the Epstein—Barr virus encoded alkaline deoxyribonuclease found in virus-producing lymphoblastoid cells

¹ Cancer Research Campaign Laboratories, Paterson Institute for Cancer Research, Christie Hospital and Holt Radium Institute, Wilmslow Road, Withington, Manchester M20 9BX
² Cancer Research Campaign Laboratories, Department of Cancer Studies, University of Birmingham Medical School, Birmingham B15 2TJ
and The³ Wellcome Research Laboratories, Langley Court, Beckenham, Kent BR3 3BS, U.K.

Antisera were raised against a purified recombinant form of the Epstein—Barr virus (EBV) alkaline deoxyribonuclease (DNase) expressed in Escherichia coli. These sera were shown to be reactive with lymphoblastoid cells expressing EBV antigens (B95-8, P3HR-1 and Raji). Immunostaining studies of cells expressing EBV antigens revealed that the DNase was a component of the restricted early antigen complex of EBV. Western blot analysis of these chemically induced cells revealed that the polypeptide associated with the EBV DNase has an M_r of approximately 55000, slightly greater than that of the recombinant form, suggesting that the protein undergoes some form of post-translational modification during virus replication. The DNase enzymic activities observed in B95-8, P3HR-1 and Raji cells following chemical induction were neutralized using the specific antiserum. A detailed examination of protein extracts from the nude mouse-passaged nasopharyngeal carcinoma cell line C-15 failed to detect any antigenic or biochemical evidence for the presence of the DNase. Immunostaining of biopsies of oral ‘hairy’ leukoplakia with the antisera against EBV DNAse revealed high level expression in the more differentiated spinous layers of the epithelium, a pattern of reactivity identical to that observed for other lytic cycle antigens.

Received 12 June 1990; accepted 22 October 1990.

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