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. 1982 Dec;2(12):1463–1471. doi: 10.1128/mcb.2.12.1463

New Properties of Simian Virus 40 Large T Antigen

Roland Seif 1
PMCID: PMC369955  PMID: 14582188

Abstract

An 8,000-molecular-weight (8K) T antigen was found in all cells transformed by simian virus 40. The 8K T antigen was weakly labeled in vivo with [35S]methionine or 32Pi. A deletion in the human papovavirus BK genome, in the region coding for the carboxy-terminal end of the large T antigen, reduced the size of the 8K T antigen. The last 80 amino acids of the large T antigen include the sequence Asp-Asp-Asp-Asp unique to the activation peptide of trypsinogen. Large T antigen bound diisopropyl fluorophosphate and was retained by d-phenylalanine coupled to Sepharose beads, an affinity adsorbent that can retain chymotrypsin. The large T antigen and the recA protein of Escherichia coli, a known protease, have several properties in common as well as several similar sequences. Antibodies against large T antigen interacted with native recA protein.

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