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American Journal of Pathology, Vol 146, 1302-1308, Copyright © 1995 by American Society for Investigative Pathology
REGULAR ARTICLES |
F Boege, A Andersen, S Jensen, R Zeidler and H Kreipe
Medizinische Poliklinik, University of Wurzburg, Germany.
Proliferation-linked expression of the nuclear Ki-S1 antigen is a significant prognostic indicator in mammary carcinomas. Here, we show staining of a protein of 170 kd by Ki-S1 antibody in immunoblots of Saccharomyces cerevisiae expressing human topoisomerase II alpha but not in the parental strain. In HL-60 cells containing both isoforms of human topoisomerase II, Ki-S1 antibody binds selectively to the 170-kd isoenzyme in a similar fashion as peptide-antibodies directed against amino acid residues 1 to 15 or 1512 to 1530 of human topoisomerase II alpha. Conversely, antibodies directed against carboxyl-terminal sequences of human topoisomerase II beta selectively stain a 180-kd protein. The immunoreactive pattern of V8 endoproteinase restriction digests of human topoisomerase II alpha was identical for Ki-S1- antibody and peptide-antibodies directed against residues 1512 to 1530 but different for peptide-antibodies directed against residues 1 to 15. The Rf values of the smallest fragment commonly recognized by Ki-S1 antibody and the carboxy terminus-specific peptide-antibody place the Ki-S1 epitope within the last 495 carboxyl-terminal amino acid residues of topoisomerase II alpha.
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