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. 1983 Nov;3(11):1996–2005. doi: 10.1128/mcb.3.11.1996

Organization of the noncontiguous promoter components of adenovirus VAI RNA gene is strikingly similar to that of eucaryotic tRNA genes.

R A Bhat, B Metz, B Thimmappaya
PMCID: PMC370067  PMID: 6656762

Abstract

The intragenic transcriptional control region (internal promoter) of the adenovirus type 2 VAI RNA gene was mutated by deletion, insertion, and substitution of DNA sequences at the plasmid level. The mutant plasmids were assayed for in vitro transcriptional activity by using HeLa cell extracts. The mutant clones with substitution or insertion of DNA sequences or both between nucleotides +18 and +53 of the VAI RNA gene were all transcriptionally active, although to various extents. Substitution of unrelated DNA sequences up to +26 or between +54 and +61 abolished the transcriptional activity completely. Based on these results, the intragenic promoter sequences of the VAI RNA gene can be subdivided into two components: element A, +10 to +18; and element B, +54 to +69. The distance between the A and B components could be enlarged from its normal 35 base pairs to 75 base pairs without destroying the transcriptional activity. However, a deletion of 4 or 6 base pairs in the DNA segment separating the A and B components (segment C) reduced the transcriptional activity of the genes to less than 2% of that of the wild type. When the VAI RNA gene with its element A or B was substituted for the corresponding element A or B of the Xenopus laevis tRNAMet gene, the hybrid genes transcribed close to the level of the wild-type VAI RNA gene and about 10- to 20-fold more efficiently than the tRNAMet gene. Thus, the organization of DNA sequences in the internal promoter of the VAI RNA gene appears to be very similar to that of eucaryotic tRNA genes. This similarity suggests an evolutionary relationship of the VAI RNA gene to tRNA genes.

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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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