Primary Citation of Related Structures: 1KOC, 1KOD
PubMed Abstract:
In a previous study, an RNA aptamer for the specific recognition of arginine was evolved from a parent sequence that bound citrulline specifically. The two RNAs differ at only 3 positions out of 44. The solution structures of the two aptamers complexed to their cognate amino acids have now been determined by two-dimensional nuclear magnetic resonance spectroscopy ...
In a previous study, an RNA aptamer for the specific recognition of arginine was evolved from a parent sequence that bound citrulline specifically. The two RNAs differ at only 3 positions out of 44. The solution structures of the two aptamers complexed to their cognate amino acids have now been determined by two-dimensional nuclear magnetic resonance spectroscopy. Both aptamers contain two asymmetrical internal loops that are not well ordered in the free RNA but that fold into a compact structure upon ligand binding. Those nucleotides common to both RNAs include a conserved cluster of purine residues, three of which form an uneven plane containing a G:G pair, and two other residues nearly perpendicular to that surface. Two of the three variant nucleotides are stacked on the cluster of purines and form a triple contact to the amino acid side chain, whereas the edge of the third variant nucleotide is capping the binding pocket.
Related Citations:
Structural Probing and Damage Selection of Citrulline-and Arginine-Specific RNA Aptamers Identify Base Positions Required for Binding Burgstaller, P., Kochoyan, M., Famulok, M. (1995) Nucleic Acids Res 23: 4769
Organizational Affiliation:
Centre de Biochimie Structurale (CBS), Unité Mixte de Recherche, CNRS 9955, Montpellier, France.
Macromolecules
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