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• W1970725479 abstract "Determinants of temperature sensitivity and/or attenuation in Sabin type 1 poliovirus reside in the 5′ NTR and coding sequences of the capsid proteins and viral RNA polymerase, 3Dpol. Previous studies have implicated at least two mutations in 3Dpol of Sabin 1 vaccine strain [PV1(S)], including a Y73H change, as contributing to these phenotypes. We have used an in vitro assay to test the first step in RNA synthesis, the uridylylation of the terminal protein VPg with 3Dpol isolated from PV1(S). Wt and two mutant 3Dpol proteins (Y73H, D53N/Y73H) were expressed in Escherichia coli and were purified, and their activities were measured in the synthesis of VPgpU(pU) and of VPg-linked poly(U) at 30 and 39.5°C. Our results show that at 39.5°C the Y73H mutation leads to a defect in the synthesis of VPgpUp(U) and of VPg-poly(U) but not in the elongation of a (dT)15 primer. The double mutant protein had the same activities as Y73H 3Dpol. Using the yeast two-hybrid assay, we detected a reduced interaction between 3Dpol molecules carrying either the single or double mutations. Tyrosine-73 maps to the finger domain in the three-dimensional structure of 3Dpol. A model will be presented in which a change of Y73 to H73 may interfere with an interaction between two polymerase molecules that, in turn, may interfere with VPg uridylylation. Alternative explanations, however, cannot be excluded at the present time." @default.
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• W1970725479 date "2000-06-01" @default.
• W1970725479 modified "2023-10-02" @default.
• W1970725479 title "Studies on the Attenuation Phenotype of Polio Vaccines: Poliovirus RNA Polymerase Derived from Sabin Type 1 Sequence Is Temperature Sensitive in the Uridylylation of VPg" @default.
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• W1970725479 doi "https://doi.org/10.1006/viro.2000.0354" @default.
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