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. 1977 May;22(2):527–539. doi: 10.1128/jvi.22.2.527-539.1977

Immunofluorescence Study of the Adenovirus Type 2 Single-Stranded DNA Binding Protein in Infected and Transformed Cells

Kenji Sugawara a,1, Zvee Gilead a, William S M Wold a, Maurice Green a
PMCID: PMC515743  PMID: 68127

Abstract

High-titer monospecific antiserum against highly purified adenovirus 2 (Ad2) single-stranded DNA binding protein (DBP) was used to study, by indirect immunofluorescence (IF), the synthesis of DBP in Ad2-infected human cells and adenovirus-transformed rat, hamster, and human cell lines. In infected cells the synthesis of DBP was first detected in the cytoplasm at 2 to 4 h postinfection and reached a maximum intensity at 6 h postinfection. At this time DBP began to accumulate in the nucleus, where it reached maximum intensity at about 14 h postinfection. The cytoplasmic IF was diffuse, whereas nuclear IF appeared as dots that coalesced into large globules as infection progressed. In cells treated with 1-β-d-arabinofuranosylcytosine to inhibit viral DNA synthesis, strong nuclear IF was observed in the form of dots, but the large fluorescent globules were not observed. The Ad2 (oncogenic group C) anti-DBP serum reacted very strongly by IF with Ad5 (group C)-infected, to a lesser extent with Ad7 and Ad11 (group B)-infected, and weakly with Ad12 and Ad18 (group A)-infected KB cells (treated with 1-β-d-arabinofuranosylcytosine). These results may indicate that Ad2 DBP is closely related immunologically to DBPs induced early after infection by adenovirus serotypes in oncogenic group C, moderately related to DBPs of serotypes in oncogenic group B, and perhaps distantly related to DBPs of serotypes in oncogenic group A. The following adenovirus-transformed cell lines were examined for DBP synthesis by IF with the Ad2 anti-DBP serum: six rat cell lines (T2C4, F17, 8662, 8638, 8617, and F161) transformed by Ad2 virus, three hamster cell lines transformed by Ad2 virus (Ad2HT1) and Ad2-simian virus 40 hybrid virus (ND1HK1 and ND4HK4), and one rat (5RK) and one human (293-31) cell line transformed by transfection with Ad5 DNA. T2C4 and 8662 appeared weakly positive, whereas Ad2HT1 and ND4HK1 were strongly positive. The other transformed cell lines did not produce DBP detectable by IF. Thus, some but not all transformed cell lines produce DBP, which indicates that DBP is not required for maintenance of cell transformation and that transformed cells can express “nontransforming” viral genes as protein.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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