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. 1975 Nov;16(5):1236–1247. doi: 10.1128/jvi.16.5.1236-1247.1975

Simian virus 40-specific proteins in HeLa cells infected with nondefective adenovirus 2-simian virus 40 hybrid viruses.

G Walter, H Martin
PMCID: PMC355723  PMID: 171451

Abstract

The synthesis of simian virus 40 (SV40)-specific proteins in HeLa cells infected with the nondefective adenovirus 2 (Ad2)-SV40 hybrid viruses, Ad2+ND2, Ad2+ND3, Ad2+ND4, and Ad2+ND5, was investigated. Infected-cell proteins were labeled with radioactive amino acids late after infection, when host protein synthesis was shut off, and analyzed by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. All polypeptides normally seen in Ad2-infected cells were found in cells infected by the hybrid viruses. In addition to the Ad2-specific proteins, cells infected with Ad2+ND2 contain two SV40-specific proteins with apparent molecular weights of 42,000 and 56,000, cells infected with Ad2+ND4 contain one protein with an apparent molecular weight of 56,000, and cells infected with Ad2+ND5 contain one protein with an apparent molecular weight of 42,000. Cells infected with Ad2+ND3 do not contain detectable amounts of proteins not seen during Ad2 infection. Pulse-chase experiments demonstrate that the SV40-specific proteins induced by Ad2+ND2, Ad2+ND4, and Ad2+ND5 are metabolically unstable. These proteins are not present in purified virions. Two nonstructural Ad2-specific proteins have been demonstrated in Ad2 and hybrid virus-infected cells which have a smaller apparent molecular weight after a short pulse than after a pulse followed by a chase. The molecular weight increase during the chase may be caused by the addition of carbohydrate to a polypeptide backbone.

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Selected References

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