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J Virol. 1979 February; 29(2): 657-665

Nucleosomal structure of Epstein-Barr virus DNA in transformed cell lines.

ABSTRACT

Micrococcal nuclease digestion was used to analyze Epstein-Barr virus (EBV) DNA structure in nuclei of transformed cells. Digests of virus-producing (P3HR-1), non-virus-producing (Raji), and superinfected Rajii cell nuclei were fractionated by electrophoresis on agarose gels, transferred to nitrocellulose, and hybridized to 32P-labeled EBV DNA. The viral DNA of Raji nuclei produced a series of bands on electrophoresis whose lengths were integral multiples of a unit size, which was the same as the repeat length of host DNA. Viral DNA in nuclei of P3HR-1 and superinfected Raji cells produced faintly visible bands superimposed on a smear of viral DNA which dominated the hybridization pattern. No differences were detected in the patterns when total DNA digests from Raji, P3HR-1, and an EBV DNA-negative cell line (U-698M) were analyzed by ethidium bromide staining or by hybridization with the use of 32P-labeled lymphoblastoid cell DNA as probe. We conclude that the EBV episomal DNA of Raji cells is folded into nucleosomes, whereas most of the viral DNA of P3HR-1 and superinfected Raji cells is not. This pattern of DNA organization differs signficantly from that in papova group viruses.

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