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- W1980442677 abstract "A non-integrated form of Epstein-Barr virus DNA was purified from the Burkitt lymphoma-derived human lymphoid cell line Raji by CsCl density gradient centrifugation and neutral glycerol gradient centrifugation. This intracellular form of the virus DNA sediments at a rate typical of a covalently closed circular DNA molecule of the size of the virus genome in both neutral and alkaline solution. Treatment with low doses of X-rays leads to a discontinuous conversion of the molecules to a form with the sedimentation properties of open circular DNA (a circular duplex molecule containing one or more single-strand breaks). The direct observation of large circular DNA molecules by electron microscopy further confirms the covalently closed circular duplex structure of part of the intracellular viral DNA. Such circular molecules were not detected in corresponding DNA fractions from Epstein-Barr virus-negative human lymphoid cell lines. In ethidium bromide/CsCl density gradient centrifugation experiments, the purified non-integrated virus DNA behaves as twisted, covalently closed DNA circles with the same initial superhelix density as polyoma virus DNA. The latter additional purification technique permits the isolation of intracellular Epstein-Barr virus DNA in > 90% pure form from non-producer cells. The molecular weight of the circular virus DNA from Raji cells, determined by contour length measurements, is the same within experimental error as that of the linear DNA from virus particles." @default.
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- W1980442677 date "1976-04-01" @default.
- W1980442677 modified "2023-10-18" @default.
- W1980442677 title "Covalently closed circular duplex DNA of Epstein-Barr virus in a human lymphoid cell line" @default.
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- W1980442677 doi "https://doi.org/10.1016/0022-2836(76)90331-4" @default.
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