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. 1993 Dec 25;21(25):5950–5956. doi: 10.1093/nar/21.25.5950

Synthetic RNA-cleaving molecules mimicking ribonuclease A active center. Design and cleavage of tRNA transcripts.

M A Podyminogin 1, V V Vlassov 1, R Giegé 1
PMCID: PMC310480  PMID: 7507235

Abstract

RNA cleaving molecules were synthesized by conjugating imidazole residues imitating the essential imidazoles in the active center of pancreatic ribonuclease to an intercalating compound, derivative of phenazine capable of binding to the double stranded regions of polynucleotides. Action of the molecules on tRNA was investigated. It was found, that some of the compounds bearing two imidazole residues cleave tRNA under physiological conditions. The cleavage reaction shows a bell-shaped pH dependence with a maximum at pH 7.0 indicating participation of protonated and non-protonated imidazole residues in the process. Under the conditions stabilizing the tRNA structure, a tRNAAsp transcript was cleaved preferentially at the junctions of the stem and loop regions of the cloverleaf tRNA fold, at the five positions C56, C43, C20.1, U13, and U8, with a marked preference for C56. This cleavage pattern is consistent with a hydrolysis mechanism involving non-covalent binding of the compounds to the double-stranded regions of tRNA followed by an attack of the imidazole residues at the juxtaposed flexible single-stranded regions of the molecule. The compounds provide new probes for the investigation of RNA structure in solution and potential reactive groups for antisense oligonucleotide derivatives.

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Selected References

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