1kod

RNA APTAMER COMPLEXED WITH CITRULLINE, NMR

spinqualitylabelsall models 1kod, 1 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1kod is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CIR Related: 1koc Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed 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. Structural basis of ligand discrimination by two related RNA aptamers resolved by NMR spectroscopy.,Yang Y, Kochoyan M, Burgstaller P, Westhof E, Famulok M Science. 1996 May 31;272(5266):1343-7. PMID:8650546 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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