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RNase mapping was used to estimate the levels of unencapsidated Sendai virus plus-strand RNAs which cross the leader-NP junction relative to NP mRNA. Significant amounts of leader readthrough RNAs were found in Z strain-infected cells, similar to that described for the polR mutant of vesicular stomatitis virus, even though this strain is considered wild type. The levels of the readthrough RNAs detected fell sharply when progressively longer probes were used, unlike that of NP mRNA. These studies suggest that polymerases which read through the first junction terminate shortly afterwards in the absence of concurrent assembly of the nascent chain, whereas those which reinitiate at NP continue efficiently to the next junction. Reinitiation appears to be necessary to convert the polymerase to a mode in which elongation is independent of concurrent assembly. Concurrent assembly appears to be required not only for the polymerase to read through the junction efficiently, but also for it to continue elongation between junctions.

Modified model for the switch from Sendai virus transcription to replication