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The foot-and-mouth disease virus-RNA polymerase complex was released from membrane particulates present in the cytoplasm of infected baby hamster kidney cells. The soluble polymerase complex was fractionated by zonal centrifugation in sucrose gradients. Two polymerase complexes (RNA and protein complex) active in the cell-free system were isolated and had S-rate ranges of 20-70S and 100-300S, respectively. The light polymerase complex contained 20S double-stranded RNA; and the heavy polymerase complex contained a polydisperse, partially RNase-resistant RNA. The cell-free product of these two polymerase complexes was analyzed by zonal centrifugation in sucrose gradients. The light polymerase complex synthesized only 20S double-stranded RNA. The product of the heavy polymerase complex contained no detectable 20S double-stranded RNA and only a peak of single-stranded RNA with S-rate corresponding to 37S viral RNA. A third polymerase complex was isolated with S-rate greater than 300S, and it contained a polydisperse, partially RNase-resistant RNA. This third polymerase complex synthesized both 37S viral RNA and 20S double-stranded RNA in the cell-free system, and it is probably the native polymerase complex still bound to cellular particulates.

THE ISOLATION OF TWO ENZYME-RIBONUCLEIC ACID COMPLEXES INVOLVED IN THE SYNTHESIS OF FOOT-AND-MOUTH DISEASE VIRUS RIBONUCLEIC ACID