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. 1984 Oct;52(1):136–144. doi: 10.1128/jvi.52.1.136-144.1984

Identification of adenovirus 12-encoded E1A tumor antigens synthesized in infected and transformed mammalian cells and in Escherichia coli.

L A Lucher, D Kimelman, J S Symington, K H Brackmann, M A Cartas, H Thornton, M Green
PMCID: PMC254499  PMID: 6384554

Abstract

A 16-amino acid peptide, H2N-Arg-Glu-Gln-Thr-Val-Pro-Val-Asp-Leu-Ser-Val-Lys-Arg-Pro-Arg-Cys-COOH (peptide 204), targeted to the common C-terminus of human adenovirus 12 (Ad12) tumor antigens encoded by the E1A 13S mRNA and 12S mRNA, has been synthesized. Antibody prepared in rabbits against peptide 204 immunoprecipitated two proteins of apparent Mr 47,000 and 45,000 from extracts of [35S]methionine-labeled Ad12-early infected KB cells and a 47,000 protein from extracts of the Ad12-transformed hamster cell line, HE C19. Immunoprecipitation analysis of infected and transformed cells labeled with 32Pi showed that both major Ad12 E1A T antigens are phosphoproteins. Immunofluorescence microscopy of Ad12-early infected KB cells with antipeptide antibody showed the site of E1A protein concentration to be predominantly nuclear. E1A proteins were detected by immunofluorescence at 4 to 6 h postinfection and continued to increase until at least 18 h postinfection. Antipeptide 204 antibody was used to analyze the proteins synthesized in Escherichia coli cells transformed by plasmids containing cDNA copies of the Ad12 E1A 13S mRNA or 12S mRNA under the control of the tac promoter (D. Kimelman, L. A. Lucher, M. Green, K. H. Brackmann, J. S. Symington, and M. Ptashne, Proc. Natl. Acad. Sci. U.S.A., in press). A major protein of ca. 47,000 was immunoprecipitated from extracts of each transformed E. coli cell clone. Two-dimensional gel electrophoretic analysis of immunoprecipitates revealed that the T antigens synthesized in infected KB cells, transformed hamster cells, and transformed E. coli cells possess very similar molecular weights and acidic isoelectric points of 5.2 to 5.4.

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