Abstract
A new rifamycin derivative, rifazone-82 (R-82), an inhibitor of viral RNA-dependent DNA polymerase, is selectively toxic to transformed chicken cells in culture. R-82 has now been shown to possess antiviral activity as well. The relatively nontoxic properties of R-82 to nontransformed cells have permitted the execution of experiments examining the effect of a rifamycin derivative on virus reproduction. Addition of low concentrations of R-82 (15 mug/ml) to cultures soon after Rous sarcoma virus infection prevents the spread of infection thoroughout the culture. This inhibition is not dependent on concomitant cellular transformation as identical results were obtained with cells infected with a transformation-defective Rous sarcoma virus. Addition of R-82 to cultures in which all the cells are infected does not substantially affect the yield of physical particles as measured by RNA-dependent DNA polymerase activity and by (3H) uridine incorporation into viral RNA. However, the infectivity of the progeny virus, as measured by focus-forming ability, is decrreased 95 to 99% by R-82 treatment.
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