439d | pdb_0000439d

5'-R(*CP*UP*GP*GP*GP*CP*GP*G)-3', 5'-R(*CP*CP*GP*CP*CP*UP*GP*G)-3'

spinqualitylabelsall models 439d, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 439d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.6Å Ligands: BA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The structure of the RNA duplex r(CUGGGCGG).r(CCGCCUGG) has been determined at 1.6 A resolution and refined to a final R factor of 18.3% (R(free) = 24.1%). The sequence of the RNA fragment resembles domain E of Thermus flavus 5S rRNA. A previously undescribed wobble-like G.C base-pair formation is found. Owing to the observed hydrogen-bond network, it is proposed that the cytosine is protonated at position N3. The unusual base-pair formation is presumably strained by intermolecular interactions. In this context, crystal packing and particular intermolecular contacts may have direct influence on the three-dimensional structure. Furthermore, this structure includes two G.U wobble base pairs in tandem conformation, with the purines forming a so-called 'cross-strand G stack'. Structure of an RNA duplex with an unusual G.C pair in wobble-like conformation at 1.6 A resolution.,Perbandt M, Vallazza M, Lippmann C, Betzel C, Erdmann VA Acta Crystallogr D Biol Crystallogr. 2001 Feb;57(Pt 2):219-24. PMID:11173467 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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