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. 1998 Jul 15;26(14):3392–3396. doi: 10.1093/nar/26.14.3392

Metal ion-dependent hydrolysis of RNA phosphodiester bonds within hairpin loops. A comparative kinetic study on chimeric ribo/2'-O-methylribo oligonucleotides.

I Zagórowska 1, S Kuusela 1, H Lönnberg 1
PMCID: PMC147710  PMID: 9649624

Abstract

Several chimeric ribo/2'- O -methylribo oligonucleotides were synthesized and their hydrolytic cleavage studied in the presence of Mg2+, Zn2+, Pb2+and the 1,4,9-triaza-cyclododecane chelate of Zn2+(Zn2+[12]aneN3) to evaluate the importance of RNA secondary structure as a factor determining the reactivity of phosphodiester bonds. In all the cases studied, a phosphodiester bond within a 4-7 nt loop was hydrolytically more stable than a similar bond within a linear single strand, but markedly less stable than that in a double helix. With Zn2+and Zn2+[12]aneN3, the hydrolytic stability of a phosphodiester bond within a hairpin loop gradually decreased on increasing the distance from the stem. A similar but less systematic trend was observed with Pb2+. Zn2+- and Pb2+-promoted cleavage was observed to be considerably more sensitive to the secondary structure of the chain than that induced by Zn2+[12]aneN3. This difference in behaviour may be attributed to bidentate binding of uncomplexed aquo ions to two different phosphodiester bonds. Mg2+was observed to be catalytically virtually inactive compared with the other cleaving agents studied.

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Selected References

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