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We have analyzed the structure of the rubella virus genome RNA and the virus-specific RNA species synthesized in B-Vero cells infected with rubella virus. A single-stranded, capped, and polyadenylated RNA species sedimenting at 40S in a sucrose gradient was released from purified virions treated with sodium dodecyl sulfate. This RNA species migrated with an Mr of about 3.8 X 10(6) in an agarose gel after denaturation with glyoxal and dimethyl sulfoxide. Infected cells labeled with [3H]uridine in the presence of actinomycin D contained, in addition to the 40S RNA, a single-stranded polyadenylated 24S RNA species as shown by sucrose gradient analysis. In a Northern blot analysis, this RNA hybridized to a cDNA probe derived from the 3' portion of the genomic 40S RNA. In vitro translation of the 24S RNA species yielded a 110,000-dalton polypeptide, in addition to some smaller products which were immunoprecipitated with an antiserum prepared against the structural proteins E1, E2a, E2b, and C. Since the sum of the molecular weights of the nonglycosylated envelope proteins and the capsid protein has been estimated to be about 116,000 (C. Oker-Blom et al., J. Virol. 46:964-973, 1983), these results suggest that the 24S RNA species represents a subgenomic mRNA coding for a precursor (p110) to the structural proteins of rubella virus. Thus, the strategy of gene expression of rubella virus appears to be similar to that of the alphaviruses.

Rubella virus 40S genome RNA specifies a 24S subgenomic mRNA that codes for a precursor to structural proteins