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Antimicrob Agents Chemother. 1977 February; 11(2): 202-208
Copyright © 1977 American Society for Microbiology. All Rights Reserved.

Synthesis of Vaccinia Viral Antigens in HeLa Cells in the Presence of Isatin Beta-Thiosemicarbazone

The Chanock Centre for Virology, Hebrew University–Hadassah Medical School, Jerusalem, Israel

ABSTRACT

Vaccinia virus antigens, in HeLa cells treated with the antipox virus drug isatin ß-thiosemicarbazone (IBT), were analyzed by immunoprecipitation, followed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The total radioactivity in the immunoprecipitate was decreased to almost 50% in the presence of the drug as compared to its absence. An inhibition also occurred with an IBT-dependent mutant (IBT^D) when growing in the absence of IBT. However, similar levels of radioactivity were observed in the immunoprecipitates from an IBT-resistant mutant (IBT^R) grown in either the absence or presence of the drug. When the antigens within the immunoprecipitates were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, it was shown that the inhibition observed in the wild-type-infected cells in the presence of IBT and in the IBT^D-infected cells in the absence of the drug, was quantitative, affecting the amounts of the different polypeptides more or less equally.