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Journal of General Virology header logo Journal of General Virology

Volume 42, Issue 1

Synthesis of Two Classes of DNA Induced by Vaccinia Virus Infection of HeLa Cells No Access

Abstract

SUMMARY

Equilibrium density gradient centrifugation in CsCl confirms that DNA synthesized after vaccinia virus infection of HeLa cells is homogeneous in buoyant density and thus in base composition and is similar in this respect to bulk HeLa cell DNA. In contrast, rate sedimentation in alkaline sucrose gradients distinguishes two main classes of virus-induced DNA, neither of which can be equated with cell DNA synthesized in the same cultures prior to infection. The slower sedimenting class of virus-induced DNA co-sediments with DNA from purified virus particles: the second class sediments faster than pre-labelled cell DNA. Heterogeneity of virus-induced DNA does not result from fragmentation of radioactively labelled DNA, virus-mediated breakdown of cell DNA or association with either proteins or polyamines. Both slow and fast sedimenting classes of virus-induced DNA contain sequences complementary to all restriction endonuclease III-specific fragments of the virus genome. The multiple species of DNA synthesized after infection are distinguished further by the effect of ethidium bromide. At a concentration which prevents the formation of infectious progeny virus, this compound inhibits selectively the synthesis of that class of virus-induced DNA which sediments faster in alkaline sucrose gradients.

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© Journal of General Virology 1979
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1979-01-01
2025-01-21
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/content/journal/jgv/10.1099/0022-1317-42-1-223
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De Novo Synthesis of Two Classes of DNA Induced by Vaccinia Virus Infection of HeLa Cells
J. Gen. Virol. 42, 223 (1979); https://doi.org/10.1099/0022-1317-42-1-223
/content/journal/jgv/10.1099/0022-1317-42-1-223
/content/journal/jgv/10.1099/0022-1317-42-1-223
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