8k0u

Crystal structure of theophylline DNA aptamer bound to hypoxanthine

spinqualitylabelsall models 8k0u, resolution 1.52Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8k0u is a 1 chain structure with sequence from Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.52Å Ligands: HPA, K, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Aptamers, which are short, single-stranded DNA or RNA, are capable of binding to a wide array of targets with exceptional selectivity. Those with high affinity for theophylline have the potential to serve as biosensors, crucial for tracking theophylline levels in the treatment of respiratory conditions. Despite the extensive structural characterization of the RNA theophylline aptamer, the DNA counterpart's ligand-recognition mechanism has remained unclear. Here, we elucidate the DNA theophylline aptamer's ligand-binding mechanism through high-resolution crystal structures of its complexes with theophylline, 3-methylxanthine, and hypoxanthine. Guided by these structural insights, we computationally redesigned the theophylline-binding pocket via rational mutagenesis of key nucleotides, generating novel aptamers selective for adenine and prequeuosine (preQ(1)) ligands. These engineered aptamers were validated through biochemical and crystallographic analyses. By integrating structural biology with computational design, our work provides a relatively simple and effective method for developing new aptamers. While this strategy does not supplant SELEX, it serves as a beneficial complement to it. From Theophylline to Adenine or preQ(1): Repurposing a DNA Aptamer Revealed by Crystal Structure Analysis.,Lin X, Huang Y, Huang J, Yuan H, Luo Y, Lu Z, Ao Y, Huang J, Chen SB, Miao Z, Huang L Angew Chem Int Ed Engl. 2025 Mar 18:e202504107. doi: 10.1002/anie.202504107. PMID:40101171 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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