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    SV40: T antigen, the A function and transformation.

    Abstract

    T antigen, a protein found in the nuclei of SV40-transformed and -infected cells, can be purified and characterized. Our data suggest that T antigen in transformed cells is found at least in part in a large 22S complex, suggesting that this 22S form may contain T antigen complexed with other viral or host proteins. We prefer the assumption that T antigen is correlated with the A function, although a definitive in vitro proof for this hypothesis is still missing. Mutants in the A function most likely interfere with the maintenance of transformation, a result inviting the interpretation that the A function may indeed govern DNA synthesis of the transformed cell or influence the cell's ability to pass from G1 (or G0) to S. Thus transformation by SV40 may be a direct consequence of the introduction of the SV40 replicon and the presence of its initiator function which is used by the transformed cell.

    PMID:
    169069
    [PubMed - indexed for MEDLINE]

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