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. 1984 May;50(2):478–488. doi: 10.1128/jvi.50.2.478-488.1984

S1 nuclease mapping of viral RNAs from a temperature-sensitive transformation mutant of murine sarcoma virus.

M Nash, N V Brown, J L Wong, R B Arlinghaus, E C Murphy Jr
PMCID: PMC255652  PMID: 6323748

Abstract

The structures of murine sarcoma virus (MuSV) ts110 viral RNA and intracellular RNA present in MuSV ts110-infected cells (6m2 cells) have been examined by S1 nuclease analysis. A previous study involving heteroduplex analysis of MuSV ts110 viral RNAs hybridized to wild-type DNA revealed the presence of two MuSV ts110 RNAs, 4.0 and 3.5 kilobases (kb) in length, containing overlapping central deletions relative to wild-type MuSV 124 viral RNA (Junghans et al., J. Mol. Biol. 161:229-255, 1982). Here we show that the deletion (termed delta 1) in the 4.0-kb RNA has a 5' border located at about nucleotide 2409 (using the numbering system of Van Beveren et al., Cell 27:97-108, 1981), a position 63 bases upstream of the junction of the p30 and p10 coding sequences. The 3' border of the delta 1 deletion is found 1,473 bases downstream at approximately nucleotide 3883, 10 nucleotides downstream of the first mos gene initiation codon. In the 3.5-kb MuSV ts110 RNA, the 5' border of the deleted central region (termed delta 2) is located in a splice consensus donor site at approximately nucleotide 2017, 330 bases downstream from the junction of the p12 and p30 coding sequences, and extends about 1,915 bases in the downstream direction to nucleotide 3935, found in a splice consensus acceptor site about 55 nucleotides downstream of the first mos gene initiation codon and 30 bases upstream of the second initiation codon. No alteration of polyadenylate addition sites was observed in either MuSV ts110 RNA species, as compared with MuSV 349 RNA. The observation that the 5' and 3' borders of the deletion in the 3.5-kb RNA are within in-frame splice donor and acceptor sites suggests strongly that the 3.5-kb RNA is derived from the 4.0-kb RNA by a temperature-sensitive splice mechanism. Data presented here show unequivocally that formation of the 3.5-kb MuSV ts110 RNA from which the P85gag-mos polypeptide is translated is temperature sensitive. At 33 degrees C, with S1 analysis, the 3.5-kb RNA is found readily in 6m2 cells. Within 4 h of a shift to 39 degrees C, however, only trace amounts of this RNA can be found. Moreover, reshifting 6m2 cells to 33 degrees C permits the reappearance of the 3.5-kb RNA at its original level.

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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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