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. 1990 Aug 11;18(15):4447–4451. doi: 10.1093/nar/18.15.4447

Identification of a non-junction phosphodiester that influences an autolytic processing reaction of RNA.

J M Buzayan 1, H van Tol 1, P A Feldstein 1, G Bruening 1
PMCID: PMC331263  PMID: 1697063

Abstract

Oligoribonucleotides with specific sequences derived from the satellite RNA of tobacco ringspot virus undergo autolytic cleavage at the CpA phosphodiester that is the junction between unit sequences of multimeric satellite RNA. Buzayan et al. (Nucleic Acids Res., 16, 4009-4023 (1988)) showed that an oligoribonucleotide with 97 satellite RNA-derived nucleotide residues self-cleaved with greatly reduced efficiency when it was synthesized in vitro from adenosine-5'-O-(1-thiotriphosphate) (abbreviated rATP alpha S) and three rNTPs. No other substitution of one rNTP by the corresponding rNTP alpha S had this effect, suggesting that a phosphorothioate CpA junction inhibits self-cleavage. Here, we replaced the usual CpA junction of a small self-cleaving oligoribonucleotide with a CpU junction. Self-cleavage of this molecule was reduced not only by rUTP alpha S-substitution, as expected, but also by partial and complete rATP alpha S-substitution. By analysis of the locations of rAMPS residues in cleavage products derived from partially rATP alpha S-substituted oligoribonucleotides, we identified A26 as the residue contributing the non-junction phosphorothioate diester that most strongly inhibited self-cleavage. Manganese ions strongly stimulated the self-cleavage of the rATP alpha S-substituted, CpU-junction oligoribonucleotide but was less effective when the junction was CpA.

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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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