Abstract
The synthesis of minus-strand RNA was studied in cell cultures infected with the heat-resistant strain of Sindbis virus and with temperature-sensitive (ts) belonging to complementation groups A, B, F, and G, all of which exhibited an RNA-negative (RNA-) phenotype when infection was initiated and maintained at 39 degrees C, the nonpermissive temperature. When infected cultures were shifted from 28 degrees C (the permissive temperature) to 39 degrees C at 3 h postinfection, the synthesis of viral minus-strand RNA ceased in cultures infected with ts mutants of complementation groups B and F, but continued in cultures infected with the parental virus and mutans of complementation groups A and G. In cultures infected with ts11 of complementation group B, the synthesis of viral minus-strand RNA ceased, whereas the synthesis of 42S and 26S plus-strand RNAs continued for at least 5 h after the shift to 39 degrees C. However, when ts11-infected cultures were returned to 28 degrees C 1 h after the shift to 39 degrees C, the synthesis of viral minus-strand RNA resumed, and the rate of viral RNA synthesis increased. The recovery of minus-strand synthesis translation of new proteins. We conclude that at least one viral function is required for alphavirus minus-strand synthesis that is not required for plus-strand synthesis. In cultures infected with ts6 of complementation group F, the syntheses of both viral plus-strand and minus-strand RNAs were drastically reduced after the shift to 39 degrees C. Since ts6 failed to synthesize both plus-strand and minus-strand RNAs after the shift to 39 degrees C, at least one common viral component appears to be required for the synthesis of both minus-strand and plus-strand RNAs.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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