Completion of RNA synthesis by viral RNA replicases

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Abstract

How the 5′-terminus of the template affects RNA synthesis by viral RNA replicases is poorly understood. Using short DNA, RNA and RNA-DNA chimeric templates that can direct synthesis of replicase products, we found that DNA templates tend to direct the synthesis of RNA products that are shorter by 1 nt in comparison to RNA templates. Template-length RNA synthesis was also affected by the concentration of nucleoside triphosphates, the identity of the bases at specific positions close to the 5′-terminus and the C2′-hydroxyl of a ribose at the third nucleotide from the 5′-terminal nucleotide. Similar requirements are observed with two bromoviral replicases, but not with a recombinant RNA-dependent RNA polymerase. These results begin to define the interactions needed for the viral replicase to complete synthesis of viral RNA.

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Tayon R., J., Kim, M. J., & Kao, C. C. (2001). Completion of RNA synthesis by viral RNA replicases. Nucleic Acids Research, 29(17), 3576–3582. https://doi.org/10.1093/nar/29.17.3576

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