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. 1985 Dec;56(3):1002–1013. doi: 10.1128/jvi.56.3.1002-1013.1985

Sequences involved in determining the locations of the 5' ends of the late RNAs of simian virus 40.

M B Somasekhar, J E Mertz
PMCID: PMC252675  PMID: 2999418

Abstract

The 5' ends of the simian virus 40 (SV40) late RNAs are heterogeneous in location, spanning a 300-nucleotide region from residues 28 to 325. To examine whether upstream or downstream measuring functions analogous to the TATA box play roles in positioning the 5' ends of these RNAs, we determined by S1 and primer extension mapping the locations of the 5' ends of the late viral RNAs made in monkey cells infected with: (i) three wild-type strains of SV40 that contain tandem duplications of the enhancer region that are 64, 85, and 91, rather than 72, base pairs in length; (ii) four viable mutants that contain alterations in the 21-base-pair tandem repeats; and (iii) four viable mutants that possess small deletions or insertions at or near the major cap site at residue 325. Most of the 5' ends of the RNAs were identical in location to those seen with wild-type strain 776. The only exceptions were the absence of RNAs whose 5' ends mapped to within three bases upstream or downstream of a sequence alteration. In addition, the sequences within residues 251 to 277 that function as transcriptional initiation sites in wild-type strain 776 also did so in their second locations in the wild-type strains in which these sequences are duplicated. Differences were noted in the relative abundances of the numerous 5' ends of the late RNAs, even among the wild-type strains. These findings indicate that many (and likely all) of the approximately two dozen locations of 5' ends of SV40 late RNAs are each determined largely by sequences within their immediate vicinity. However, sequences somewhat removed from these transcriptional initiation sites may modulate the efficiencies with which they are utilized.

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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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