Download MendeleyStructural basis of ligand discrimination by two related RNA aptamers resolved by NMR spectroscopy.
Yang, Y., Kochoyan, M., Burgstaller, P., Westhof, E., Famulok, M.(1996) Science 272: 1343-1347
- PubMed: 8650546
- DOI: https://doi.org/10.1126/science.272.5266.1343
- 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. 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.
Organizational Affiliation:
Centre de Biochimie Structurale (CBS), Unité Mixte de Recherche, CNRS 9955, Montpellier, France.
