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- W2028514314 abstract "SV40-transfonned Chinese hamster CO631 cells pretreated with N -methyl- N' -nitro- N -nitrosoguanidine (MNNG) display SV40 DNA amplification. This study shows that following MNNG treatment elevated T antigen synthesis and a 4.5-fold reduction in the extent of its phosphorylation occurred in both pulselabeled and steady-state-labeled cells. The decrease in phosphorylation was found to be inversely related to carcinogen concentration, i.e. an augmented carcinogen concentration brought about a gradual reduction in T antigen phosphorylation and elevated SV40 DNA amplification. Although the majority of phosphorylation sites on T antigen derived from carcinogen-treated cells were underexpressed, as demonstrated by two-dimensional phosphopeptide mapping, peptide 12 bearing phos-phoThr124, which is known to be essential for DNA replication, was overexpressed. Carcinogen-treated cells showed no changes in p53 synthesis, but it was phosphoryl-ated to a lesser degree. Two-dimensional mapping revealed that the predicted N-terminal major phosphopeptide of p53 extracted from CO631 cells exhibited a lower chromato-graphic mobility than p53 phosphopeptides from SV40-infected monkey BSC-1 cells. In treated CO631 cells the Rf value of this phosphopeptide was higher than that of control p53. This finding could be ascribed to the failure to phosphorylate the corresponding amino acid residue in this peptide. Moreover, treatment did not affect the half-life of either T antigen or p53 proteins, but caused a dramatic rise in the expression of small t antigen, presumably due to amplification of SV40 DNA." @default.
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- W2028514314 date "1996-01-01" @default.
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- W2028514314 title "CANCER BIOLOGY: Phosphorylation of T antigen and p53 in carcinogen-treated SV40-transformed Chinese hamster cells" @default.
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- W2028514314 doi "https://doi.org/10.1093/carcin/17.5.939" @default.
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