title: Requirement for the C-terminal region of middle T-antigen in cellular transformation by polyoma virus.
abstract: Deletions of polyoma virus DNA around the region that codes for the C-terminus of the viral middle T-antigen were created using a transforming fragment (BamH I/EcoR I) of viral DNA cloned in the plasmid vector pAT153. These species were recloned and assayed for their ability to transform Rat-1 cells in culture. Our results showed that whereas the DNA sequence between the presumed translational termination codon for the viral middle T-antigen and the single viral EcoR I site could be removed with no apparent effect on transformation, the removal of the termination codon itself or any amino acid coding sequences of this protein caused a drastic decrease in the transforming ability of the DNA. Transfection of Rat-1 cells with plasmids that contained viral DNA with deletions which corresponded to the last fourteen or more amino acids of the middle T-antigen never gave rise to cellular transformation.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics / Q000502:physiology*; D000956:Antigens, Viral / Q000235:genetics / Q000502:physiology*; D000957:Antigens, Viral, Tumor; D001483:Base Sequence; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004279:DNA, Viral / Q000502:physiology*; D015245:Deoxyribonuclease BamHI; D015246:Deoxyribonuclease EcoRI; D004926:Escherichia coli / Q000235:genetics; D010957:Plasmids; D011120:Polyomavirus / Q000235:genetics*; D051381:Rats
chemical_list: D000951:Antigens, Neoplasm; D000956:Antigens, Viral; D000957:Antigens, Viral, Tumor; D004279:DNA, Viral; D004262:DNA Restriction Enzymes; D015245:Deoxyribonuclease BamHI; D015246:Deoxyribonuclease EcoRI