1j6s

Crystal Structure of an RNA Tetraplex (UGAGGU)4 with A-tetrads, G-tetrads, U-tetrads and G-U octads

spinqualitylabelsall models 1j6s, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1j6s is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.4Å Ligands: BA, BRU, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Purine-rich regions in DNA and RNA may contain both guanines and adenines, which have various biological functions. Here we report the crystal structure of an RNA purine-rich fragment containing both guanine and adenine at 1.4 A resolution. Adenines form an adenine tetrad in the N6-H em leader N7 conformation. Substitution of an adenine tetrad in the guanine tetraplex does not change the global conformation but introduces irregularity in both the hydrogen bonding interaction pattern in the groove and the metal ion binding pattern in the central cavity of the tetraplex. The irregularity in groove binding may be critical for specific binding in tetraplexes. The formation of G-U octads provides a mechanism for interaction in the groove. Ba(2+) ions prefer to bind guanine tetrads, and adenine tetrads can only be bound by Na(+) ions, illustrating the binding selectivity of metal ions for the tetraplex. Crystal structure of an RNA purine-rich tetraplex containing adenine tetrads: implications for specific binding in RNA tetraplexes.,Pan B, Xiong Y, Shi K, Deng J, Sundaralingam M Structure. 2003 Jul;11(7):815-23. PMID:12842044 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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