Abstract
We recently reported that vesicular stomatitis virus pol R mutants contain a template-associated N-protein alteration which allows for efficient readthrough of leader RNA termination sites in vitro (Perrault et al., Cell 35:175-185, 1983). We show here that in vitro RNA synthesis mediated by pol R virions is much more resistant to replacement of ATP by the analog beta,gamma-imido ATP than by wild-type virus (approximately 50% inhibition versus approximately 95%). Characterization of beta,gamma-imido ATP-resistant and control products by size, polyadenylic acid content, frequency of initiation at the 3' end of the template, and readthrough of the leader-N gene junction leads us to conclude the following: (i) most likely, the ATP dependence of the transcription process primarily reflects a requirement for initiation or entry of the polymerase at the 3' end of the template; (ii) this requirement is largely bypassed in the mutant pol R viruses; (iii) the synthesis of small, internally initiated transcripts by wild-type virus is less dependent on ATP than that of leader RNA; and (iv) termination at leader RNA sites is not directly affected when beta,gamma-imido ATP is added before initiation of synthesis. These results are discussed in terms of the possible roles of ATP and the nucleocapsid protein in initiation and termination of vesicular stomatitis virus RNA synthesis.
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