3d0m

X-ray structures of the (GUGGUCUGAUGAGGCC) RNA duplex

spinqualitylabelsall models 3d0m, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3d0m is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The structures of two crystal forms of the RNA 16-mer with the sequence GUGGUCUGAUGAGGCC, grown in the presence of a high concentration of sulphate ions, have been determined using synchrotron radiation at 1.4- and 2.0-A resolution. RNA with this sequence is known as one of the two strands of the noncleavable form of the hammerhead ribozyme. In both crystal structures, two G(syn)-G(anti) noncanonical base pairs are observed in the middle of a 14 base-pair (bp) duplex having 5'-dangling GU residues. Both structures contain sulphate anions interacting with the G-G bp stabilizing G in its syn conformation and bridging the two RNA strands. In both cases the interactions take place in the major groove, although the anions are accommodated within different helix geometries, most pronounced in the changing width of the major groove. In one structure, where a single sulphate spans both G-G pairs, the major groove is closed around the anion, while in the other structure, where each of the two G-G pairs is associated with a separate sulphate, the groove is open. This work provides the first examples of a G-G pair in syn-anti conformation, which minimizes the purine-purine clash in the center of the duplex, while utilizing its residual hydrogen bonding potential in specific interactions with sulphate anions. Noncanonical G(syn)-G(anti) base pairs stabilized by sulphate anions in two X-ray structures of the (GUGGUCUGAUGAGGCC) RNA duplex.,Rypniewski W, Adamiak DA, Milecki J, Adamiak RW RNA. 2008 Sep;14(9):1845-51. Epub 2008 Jul 24. PMID:18658118 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribozyme 3D structures

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