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  • Original Paper
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Different functions are required for initiation and maintenance of immortalization of rat embryo fibroblasts by SV40 large T antigen

Oncogene volume 18, pages 7343–7350 (1999)Cite this article

Abstract

We have used two different, but complementary assays to characterize functions of SV40 T antigen that are necessary for its ability to immortalize rat embryo fibroblasts. In accordance with previous work, we found that several functions were required. These include activities that map to the p53 binding domain and the amino terminal 176 amino acids which contain the J domain as well as the CR1 and CR2 domain required for binding and sequestering the RB family of pocket proteins. Moreover, we found that even though activities dependent only upon the amino terminus were sufficient for immortalization they were unable to maintain it. This suggests that immortalization by these amino terminal functions requires either additional events or immortalization of a subset of cells within the heterogeneous rat embryo fibroblast population. We further found that an activity dependent upon amino acids 17 – 27 which remove a portion of the CR1 domain and the predicted α-1 helix of the J domain was not necessary to maintain growth but was required for direct immortalization suggesting that at least one of the functions required initially was not required to maintain the immortal state. This represents the first demonstration that some of the functions required for maintenance of the immortal state differ from those required for initiation of immortalization.

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Acknowledgements

AJ Powell, AJ Darmon and ES Gonos contributed equally to this work. We would like to thank Y Gluzman, MJ Tevethia, LM Sompayrac, JA DeCaprio, R Brown, E Gurney, JM Pipas and J Gannon for their generous gifts of reagents, and Z Ikram for technical assistance. We are indebted to JM Pipas for helpful discussions, mutant constructs and his comments on the manuscript.

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Authors and Affiliations

  1. Ludwig Institute for Cancer Research, Royal Free and University College School of Medicine, Courtauld Building, 91 Riding House Street, London, W1P 8BT, UK

    Andrew J Powell, Alison J Darmon, Efstathios S Gonos & Parmjit S Jat

  2. Ludwig Institute for Cancer Research and Section of Cell Biology and Virology, Imperial College School of Medicine, St. Mary's Campus, Norfolk Place, London, W2 1PG, UK

    Eric W-F Lam

  3. Laboratory of Retrovirus Research, CBER, FDA, Bethesda, 20892, Maryland, MD, USA

    Keith WC Peden

  4. Department of Biochemistry and Molecular Biology, University College London, Gower Street, London, WC1E 6BT, UK

    Parmjit S Jat

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  1. Andrew J Powell
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Powell, A., Darmon, A., Gonos, E. et al. Different functions are required for initiation and maintenance of immortalization of rat embryo fibroblasts by SV40 large T antigen. Oncogene 18, 7343–7350 (1999). https://doi.org/10.1038/sj.onc.1203154

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