8d2b

Crystal structure of theophylline aptamer in complex with TAL2

spinqualitylabelsall models 8d2b, resolution 1.44Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8d2b is a 2 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 1.44Å Ligands: MG, NA, QAX Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed There is growing interest in therapeutic intervention that targets disease-relevant RNAs using small molecules. While there have been some successes in RNA-targeted small-molecule discovery, a deeper understanding of structure-activity relationships in pursuing these targets has remained elusive. One of the best-studied tertiary-structured RNAs is the theophylline aptamer, which binds theophylline with high affinity and selectivity. Although not a drug target, this aptamer has had many applications, especially pertaining to genetic control circuits. Heretofore, no compound has been shown to bind the theophylline aptamer with greater affinity than theophylline itself. However, by carrying out a high-throughput screen of low-molecular-weight compounds, several unique hits were identified that are chemically distinct from theophylline and bind with up to 340-fold greater affinity. Multiple atomic-resolution X-ray crystal structures were determined to investigate the binding mode of theophylline and four of the best hits. These structures reveal both the rigidity of the theophylline aptamer binding pocket and the opportunity for other ligands to bind more tightly in this pocket by forming additional hydrogen-bonding interactions. These results give encouragement that the same approaches to drug discovery that have been applied so successfully to proteins can also be applied to RNAs. Discovery of small molecules that target a tertiary-structured RNA.,Menichelli E, Lam BJ, Wang Y, Wang VS, Shaffer J, Tjhung KF, Bursulaya B, Nguyen TN, Vo T, Alper PB, McAllister CS, Jones DH, Spraggon G, Michellys PY, Joslin J, Joyce GF, Rogers J Proc Natl Acad Sci U S A. 2022 Nov 29;119(48):e2213117119. doi: , 10.1073/pnas.2213117119. Epub 2022 Nov 21. PMID:36413497 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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