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. 1995 Dec 11;23(23):4769–4776. doi: 10.1093/nar/23.23.4769

Structural probing and damage selection of citrulline- and arginine-specific RNA aptamers identify base positions required for binding.

P Burgstaller 1, M Kochoyan 1, M Famulok 1
PMCID: PMC307463  PMID: 8532517

Abstract

In a recent study, an RNA aptamer for the specific recognition of the amino acid L-arginine was evolved from an in vitro selected L-citrulline binding parent sequence [M. Famulok (1994) J. Am. Chem. Soc. 116, 1698-1706]. We have now carried out a structural analysis of these aptamers by using chemical modification experiments. Footprinting experiments and a damage selection approach were performed to identify those positions protected from modification in the presence of the amino acids and modifications that interfere with the binding of the ligand. It is shown that of the two bulged regions present in both aptamers one can be modified without loss of binding activity whereas in the other bulge nearly every position is shown to be involved in the recognition of the ligands. This might be indicative for non-canonical base pairing to occur within the non-Watson-Crick paired regions which might be stabilized by the complexed amino acid. Binding to the cognate amino acid significantly enhances the conformational stability of the RNA. We also tested the sensitivity of both aptamers towards lead (II) ion induced cleavage and identified a hypersensitive cleavage site within the invariant bulged region. Lead cleavage is inhibited by the complexed amino acid, indicating a conformational change of the aptamer upon ligand binding. NMR titration data obtained with both aptamers and their cognate ligands confirm the proposed conformational changes and indicate the formation of a 1:1 complex of RNA:amino acid.

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