PMID: 2110477Feb 13, 1990Paper

Iron(II)-ethylenediaminetetraacetic acid catalyzed cleavage of RNA and DNA oligonucleotides: similar reactivity toward single- and double-stranded forms

Biochemistry
D W Celander, T R Cech

Abstract

Fe(II)-EDTA catalyzes the cleavage of nucleic acids with little or no base-sequence specificity. We have now studied the preference of this reagent in catalyzing the cleavage of single- versus double-stranded nucleic acid structures. Three RNA and two DNA molecules, each expected to contain both single- and double-stranded regions, were synthesized and their structures characterized by enzymatic digestion using secondary structure specific nucleases. Fe(II)-EDTA catalyzed nearly uniform strand scission along the entire length of each molecule; no correlation with secondary structure was observed. The homopolymer sequence dA30:dT30, embedded in a mixed-sequence context to promote exact register of the homopolymer tract, was cleaved to an extent similar to that of flanking sequences. The reactions were relatively insensitive to K+, Na+, and Mg2+ in the range 10-100 mM and were quenched by Tris-HCl buffer. We conclude that the Fe(II)-EDTA-catalyzed strand scission reaction does not discriminate between typical single- and double-stranded regions, which simplifies the interpretation of experiments in which the reaction is used to probe the tertiary structure of RNA molecules [Latham, J. A., & Cech, T. R. (1989) Science 245, 276-282].

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