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Journal of Virology logoLink to Journal of Virology
. 1979 Aug;31(2):484–493. doi: 10.1128/jvi.31.2.484-493.1979

Heterogeneity of the 5' terminus of late mRNA induced by a viable simian virus 40 deletion mutant.

G Haegeman, H van Heuverswyn, D Gheysen, W Fiers
PMCID: PMC353471  PMID: 225567

Abstract

d1-1811 is a viable simian virus 40 deletion mutant which lacks the DNA region corresponding to the major capping site of the late viral RNA. The exact size of the deletion (40 base pairs) was determined by comparison of the mutant DNA sequence with the wild-type simian virus 40 (strain 776) DNA sequence. Although d1-1811 forms somewhat smaller plaques, the amount of viral RNA late after infection was not significantly reduced compared with that of the wild type. Virus-specific, polyadenylate-containing, 32P-labeled late RNA was purified from the cytoplasm and enzymatically degraded to characterize the 5' terminus. The cap-containing oligonucleotides were isolated, and their structures were analyzed by further digestion. Instead of a single cap structure, we found a variety of capped 5' termini, with adenosine caps occurring much more frequently than guanosine caps. Nevertheless, there was a remarkable homology between both types of terminal sequences. Conceivably, the minor cap population present in wild-type simian virus 40 late mRNA may correspond to the collection of capped termini identified in the d1-1811 late mRNA . Cellular cytoplasmic RNA shows a similar pattern of cap structures, but the relative abundance is quite different.

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Selected References

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