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Localization of reverse-transcriptase in interferon-treated mouse cells chronically infected with Moloney leukemia virus

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Summary

Interferon treatment of mouse cells chronically infected with Moloney leukemia virus (3T3/MLV) resulted in 97 per cent inhibition of infective virus release.

The intracellular localization and distribution of virus reverse-transcriptase and group specific (gs) antigen were determined in interferon treated and control cells. Cytoplasm of infected cells was fractionated by isopycnic centrifugation on discontinuous sucrose gradients. Fractions were analysed for their chemical composition and characterized by the activity of membranal marker enzymes. The association and levels of viral antigens were determined in each fraction. Fractions enriched with 5′ nucleotidase, specific enzyme marker for plasma membrane, were also enriched with viral proteins. In interferon treated cells, intracellular accumulation of viral proteins was specifically localized in the plasma membrane. Threefold increase in reverse-transcriptase level was the maximal accumulation found in purified plasma membranes. Intracellular enzyme levels in interferon treated cells were in accordance with the amount of cell associated infective virus particles. The small accumulation of viral proteins and infective virus particles was not sufficient to account for the great reduction in virus yield observed in the supernatants of the interferon treated cells. A possible role for interferon in modification of plasma membrane associated with virus assembly is postulated.

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  1. Department of Human Microbiology, Sackler School of Medicine, Tel-Aviv University, Ramat-Aviv, Tel-Aviv, Israel

    L. Sherman, E. Eylan & Y. Teitz

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  1. L. Sherman
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  2. E. Eylan
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  3. Y. Teitz
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Sherman, L., Eylan, E. & Teitz, Y. Localization of reverse-transcriptase in interferon-treated mouse cells chronically infected with Moloney leukemia virus. Archives of Virology 66, 143–155 (1980). https://doi.org/10.1007/BF01314982

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