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An embryo protein induced by SV40 virus transformation of mouse cells

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Abstract

A specific protein of molecular weight (MW) ∼55,000 (55K) was found recently by immunoprecipitation in all SV40 virus-transformed mammalian cells1–8, in addition to the SV40 large T antigen (∼94K) and small t antigen (∼17K), which are the only proteins coded by the ‘early half’ of the SV40 genome. The 55K protein is encoded by cellular DNA; its peptide pattern is different from that of the SV40 antigens and it is species specific in mouse, rat, hamster, monkey and human SV40-transformed (or infected) cells6–9. A 55K protein with a similar peptide pattern was found in mouse embryonal carcinoma cells not exposed to SV404,5. Similar proteins were reported in mouse sarcomas and leukaemias induced by a great variety of aetiological agents and also in a spontaneously transformed mouse fibroblast cell line10, and it has been suggested that the protein may be a general correlate of cellular tumorigenicity11–13. We now report that the ∼55K protein is present in primary cell cultures from 12–14-day old mouse embryos, but not in 16-day old mouse embryos. The embryo protein has a peptide pattern virtually indistinguishable from that of the SV40-induced protein. We also show by comparing closely related cell families that spontaneously transformed highly tumorigenic mouse cells do not possess the 55K protein.

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Authors and Affiliations

  1. National Institutes of Health, National Cancer Institute, Bethesda, Maryland, 20205

    Peter T. Mora, K. Chandrasekaran & Vivian W. McFarland

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  1. Peter T. Mora
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  2. K. Chandrasekaran
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  3. Vivian W. McFarland
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Mora, P., Chandrasekaran, K. & McFarland, V. An embryo protein induced by SV40 virus transformation of mouse cells. Nature 288, 722–724 (1980). https://doi.org/10.1038/288722a0

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