1udq

Crystal structure of the tRNA processing enzyme RNase PH T125A mutant from Aquifex aeolicus

spinqualitylabelsall models 1udq, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1udq is a 1 chain structure with sequence from "aquifex_aeolicus"_huber_and_stetter_2001 "aquifex aeolicus" huber and stetter 2001. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: PO4, SO4 Related: 1udn, 1udo, 1uds Activity: tRNA nucleotidyltransferase, with EC number 2.7.7.56 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT, TOPSAN Function [RNPH_AQUAE] Phosphorolytic exoribonuclease that removes nucleotide residues following the -CCA terminus of tRNA and adds nucleotides to the ends of RNA molecules by using nucleoside diphosphates as substrates (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed RNase PH is one of the exoribonucleases that catalyze the 3' end processing of tRNA in bacteria. RNase PH removes nucleotides following the CCA sequence of tRNA precursors by phosphorolysis and generates mature tRNAs with amino acid acceptor activity. In this study, we determined the crystal structure of Aquifex aeolicus RNase PH bound with a phosphate, a co-substrate, in the active site at 2.3-A resolution. RNase PH has the typical alpha/beta fold, which forms a hexameric ring structure as a trimer of dimers. This ring structure resembles that of the polynucleotide phosphorylase core domain homotrimer, another phosphorolytic exoribonuclease. Four amino acid residues, Arg-86, Gly-124, Thr-125, and Arg-126, of RNase PH are involved in the phosphate-binding site. Mutational analyses of these residues showed their importance in the phosphorolysis reaction. A docking model with the tRNA acceptor stem suggests how RNase PH accommodates substrate RNAs. Crystal structure of the tRNA processing enzyme RNase PH from Aquifex aeolicus.,Ishii R, Nureki O, Yokoyama S J Biol Chem. 2003 Aug 22;278(34):32397-404. Epub 2003 May 12. PMID:12746447 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease 3D structures

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