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. 1975 Dec;16(6):1435–1443. doi: 10.1128/jvi.16.6.1435-1443.1975

Characterization of the mRNA of influenza virus.

S E Glass, D McGeoch, R D Barry
PMCID: PMC355752  PMID: 1202243

Abstract

The kinetics of the appearance of influenza mRNA, the distribution of mRNA between free and membrane-associated polyribosomes, its poly(A) content, and the extent to which the genome was transcribed into mRNA early in infection were determined. Polyribosomes were prepared from influenza virus-infected cells labeled for 30-min periods at various times after infection with [3H]uridine. Most of the 3H-labeled RNA extracted from these polyribosomes sedimented as a heterogeneous 8S to 20S peak in sucrose gradients, and it was largely complementary to virion RNA. By the following criteria, the complementary RNA had properties normally ascribed to mRNA: (i) it labeled rapidly with [3H]uridine; (ii) after glutaraldelyde treatment, it banded with polyribosomes in CsCl density gradients; and (iii) it contained poly(A). In chick cells at 37 C, virus mRNA was first detectable at 45 min postinfection and reached its maximal rate of appearance at 2 to 2.5 h postinfection. The free and membrane-bound polyribosomes of infected cells were separated and were found to contain the same classes of mRNA. There was no absolute segregation of mRNA sequences into either polyribosome class although each probably contained distinct ratios of the different mRNA's. From 45 min postinfection onwards, both membrane-bound and free polysomal poly(A)-containing RNA contained sequences complementary to at least 80% of the genome RNA, whereas poly(A)-minus RNA contained sequences complementary to 90 to 100% of the genome. There was no evidence for the temporal control of transcription of influenza mRNA. At 31 C, when virus development was slowed relative to 37 C,complementary RNA first appeared at 1 h postinfection. At this time, total polysomal RNA contained sequences complementary to the whole genome.

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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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