Isatin-beta-thiosemicarbazone causes premature cessation of vaccinia virus-induced late post-replicative polypeptide synthesis.

The effects of isatin-beta-thiosemicarbazone on vaccinia virus-induced polypeptide synthesis has been examined by polyacrylamide gel electrophoresis and autoradiography. The synthesis of pre-replicative and early post-replicative polypeptides proceeded normally in the presence of the drug; the onset of late post-replicative polypeptide synthesis occurred with normal timing under these conditions but the rate of synthesis of all virus polypeptides then declined rapidly.