Abstract
Poliovirus replicase- and host factor-catalyzed copying of 3'-terminal polyadenylic acid [poly(A)] of poliovirion RNA was studied. Host factor-stimulated synthesis of polyuridylic acid [poly(U)] by the replicase required ATP in addition to UTP. ATP was not required for the oligouridylic acid-primed copying of 3'-terminal poly(A) of virion RNA. GTP, CTP, and AMP-PCP (5'-adenylyl beta-gamma methylenediphosphate, an ATP analog) could not replace ATP in host factor-stimulated synthesis of poly(U). Antibodies to poliovirus genome-linked protein (VPg) specifically precipitated in vitro-synthesized poly(U) from a host factor-stimulated reaction. The poly(U) synthesized in a host factor-stimulated reaction was shown to be attached to VPg precursor polypeptide(s) via a tyrosine-phosphate bond as found in poliovirion VPg-RNA.
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