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Simian virus 40-transformed V11 F1 clone 1 subclone 7 rat cells produced a considerable amount of an elongated form of large-T antigen with an Mr of 115,000 (115K super-T antigen), but these cells did not produce detectable traces of normal-sized large-T antigen (86,000 daltons) (P. May, M. Kress, M. Lange, and E. May, Cold Spring Harbor Symp. Quant. Biol. 44:189-200, 1980). First, a comparison of the tryptic peptide fingerprints of 115K super-T and large-T antigens suggested that 115K super-T antigen is simian virus 40 coded and contains a duplication of amino acid sequences of large-T antigen. Second, from S1 mapping analysis of 115K super-T mRNA, performed with various restriction fragments of simian virus 40 DNA, it was concluded that super-T mRNA is a form of large-T mRNA containing a tandem duplication of the sequence extending from approximately 0.46 to 0.35 map unit. The duplicated sequence corresponded to that region of the simian virus 40 genome in which 12 of 13 tsA mutation sites are clustered (C. J. Lai and D. Nathans, Virology 66:70-81, 1975).

Mapping of the viral mRNA encoding a super-T antigen of 115,000 daltons expressed in simian virus 40-transformed rat cell lines