Abstract
The L and NS proteins of vesicular stomatitis virus were purified from transcribing ribonucleoprotein complex and were used to study their requirements and functions during reconstitution of RNA synthesis in vitro . The requirements for L and NS proteins for optimal RNA synthesis were found to be catalytic and stoichiometric, respectively. Addition of increasing amounts of NS protein to N-RNA template and saturating L protein, the ratio of N-mRNA to leader RNA synthesis increased linearly. In contrast, when the concentration of L protein was increased the corresponding ratio remained constant. These results, coupled with the observation that the L protein is involved in the initiation of RNA synthesis, suggest that the NS protein is involved in the RNA chain elongation step. The NS protein possibly interacts with both the L protein and the template N-RNA and unwinds the latter to facilitate the movement of L protein on the template RNA.
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