1q9a

Crystal structure of the sarcin/ricin domain from E.coli 23S rRNA at 1.04 resolution

spinqualitylabelsall models 1q9a, resolution 1.04Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1q9a is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1msy, 483d, 1jbs, 1jbr, 480d, 1q93, 1q96 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Bulged-G motifs are ubiquitous internal RNA loops that provide specific recognition sites for proteins and RNAs. To establish the common and distinctive features of the motif we determined the structures of three variants and compared them with related structures. The variants are 27-nt mimics of the sarcin/ricin loop (SRL) from Escherichia coli 23S ribosomal RNA that is an essential part of the binding site for elongation factors (EFs). The wild-type SRL has now been determined at 1.04 A resolution, supplementing data obtained before at 1.11 A and allowing the first calculation of coordinate error for an RNA motif. The other two structures, having a viable (C2658U*G2663A) or a lethal mutation (C2658G*G2663C), were determined at 1.75 and 2.25 A resolution, respectively. Comparisons reveal that bulged-G motifs have a common hydration and geometry, with flexible junctions at flanking structural elements. Six conserved nucleotides preserve the fold of the motif; the remaining seven to nine vary in sequence and alter contacts in both grooves. Differences between accessible functional groups of the lethal mutation and those of the viable mutation and wild-type SRL may account for the impaired elongation factor binding to ribosomes with the C2658G*G2663C mutation and may underlie the lethal phenotype. The common and the distinctive features of the bulged-G motif based on a 1.04 A resolution RNA structure.,Correll CC, Beneken J, Plantinga MJ, Lubbers M, Chan YL Nucleic Acids Res. 2003 Dec 1;31(23):6806-18. PMID:14627814 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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