Characterization and divalent metal-ion dependence of in vitro selected deoxyribozymes which cleave DNA/RNA chimeric oligonucleotides

Journal of Molecular Biology
D Faulhammer, M Famulok

Abstract

By in vitro selection, a variety of catalytic DNA oligonucleotides were obtained which cleave chimeric oligonucleotides at a single ribonucleotide position embedded within a deoxyribonucleotide context in the presence or absence of divalent metal ions. After several cycles of selection/amplification in the absence and in the presence of low amounts of Mg2+ two different types of catalysts emerged: one type depended strongly on Mg2+ or other divalent metal ions, the other type performed cleavage reactions independently of Mg2+ in the presence of spermine. Experimental analysis of the secondary structure of some of the selected deoxyribozymes was carried out by chemical probing. The ribonucleotide in the selected catalysts is unpaired and presents the cleavage site to the attacking nucleophile. Our results suggest that the main selection criterion under metal-free conditions was a favourable arrangement of the attacking nucleophile and the phosphate leaving group. The cleavage rates of the selected divalent metal independent catalysts are within the same order of magnitude as the rate of metal independent substrate hydrolysis in the hammerhead ribozyme. One of the metal dependent catalysts showed an unexpected preference for Ca2+...Continue Reading

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