title: Inhibition of the synthesis of Moloney leukemia virus structural proteins by N-methylisatin-beta-4',4'-diethylthiosemicarbazone.
abstract: The mechanism of inhibition of Moloney leukemia virus by N-methylisatin-beta-4',4'-diethylthiosemicarbazone was studied. Experiments that used [3H]leucine for short-pulse labeling in the presence of the drug resulted in a 71% inhibition in the synthesis of Pr-80, the polypeptide precursor of the gag viral proteins. The radioactive pulse products of the polypeptide precursors after a further 2-h chase period showed a normal cleavage of the precursors, with the formation of a reduced amount of final mature viral structural proteins. The experimental evidence indicated that at the inhibitory concentration of 17 microM N-methylisatin-beta-4',4'-diethylthiosemicarbazone, the amount of intracellular viral RNA was not affected, whereas the activities of reverse transcriptase and the other viral protein syntheses were suppressed.
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000494:pharmacology*; D002460:Cell Line; D002499:Centrifugation, Density Gradient; D008720:Methisazone / Q000031:analogs & derivatives / Q000494:pharmacology*; D051379:Mice; D008979:Moloney murine leukemia virus / Q000254:growth & development / Q000378:metabolism*; D011233:Precipitin Tests; D012367:RNA, Viral / Q000096:biosynthesis; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism; D013882:Thiosemicarbazones / Q000494:pharmacology*; D014764:Viral Proteins / Q000096:biosynthesis*; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D012367:RNA, Viral; D013882:Thiosemicarbazones; D014764:Viral Proteins; C022832:N-methylisatin beta-4',4'-diethylthiosemicarbazone; D012194:RNA-Directed DNA Polymerase; D008720:Methisazone