2p89

Solution structure of the 3' pseudouridyation pocket of U65 snoRNA with bound substrate

spinqualitylabelsall models 2p89 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2p89 is a 2 chain structure with sequence from Homo sapiens. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed During the biogenesis of eukaryotic ribosomal RNA (rRNA) and spliceosomal small nuclear RNA (snRNA), uridines at specific sites are converted to pseudouridines by H/ACA ribonucleoprotein particles (RNPs). Each H/ACA RNP contains a substrate-specific H/ACA RNA and four common proteins, the pseudouridine synthase Cbf5, Nop10, Gar1, and Nhp2. The H/ACA RNA contains at least one pseudouridylation (psi) pocket, which is complementary to the sequences flanking the target uridine. In this article, we show structural evidence that the psi pocket can form the predicted base pairs with substrate RNA in the absence of protein components. We report the solution structure of the complex between an RNA hairpin derived from the 3' psi pocket of human U65 H/ACA small nucleolar RNA (snoRNA) and the substrate rRNA. The snoRNA-rRNA substrate complex has a unique structure with two offset parallel pairs of stacked helices and two unusual intermolecular three-way junctions, which together organize the substrate for docking into the active site of Cbf5. The substrate RNA interacts on one face of the snoRNA in the complex, forming a structure that easily could be accommodated in the H/ACA RNP, and explains how successive substrate RNAs could be loaded onto and unloaded from the H/ACA RNA in the RNP. H/ACA small nucleolar RNA pseudouridylation pockets bind substrate RNA to form three-way junctions that position the target U for modification.,Wu H, Feigon J Proc Natl Acad Sci U S A. 2007 Apr 17;104(16):6655-60. Epub 2007 Apr 5. PMID:17412831 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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