1prz

Crystal structure of pseudouridine synthase RluD catalytic module

spinqualitylabelsall models 1prz, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1prz is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT, TOPSAN Function RLUD_ECOLI Responsible for synthesis of pseudouridine from uracil at positions 1911, 1915 and 1917 in 23S ribosomal RNA. Isomerization occurs as a late step during the assembly of the large ribosomal subunit. 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 Pseudouridine (5-beta-D-ribofuranosyluracil, Psi) is the most commonly found modified base in RNA. Conversion of uridine to Psi is performed enzymatically in both prokaryotes and eukaryotes by pseudouridine synthases (EC 4.2.1.70). The Escherichia coli Psi-synthase RluD modifies uridine to Psi at positions 1911, 1915 and 1917 within 23S rRNA. RluD also possesses a second function related to proper assembly of the 50S ribosomal subunit that is independent of Psi-synthesis. Here, we report the crystal structure of the catalytic module of RluD (residues 68-326; DeltaRluD) refined at 1.8A to a final R-factor of 21.8% (R(free)=24.3%). DeltaRluD is a monomeric enzyme having an overall mixed alpha/beta fold. The DeltaRluD molecule consists of two subdomains, a catalytic subdomain and C-terminal subdomain with the RNA-binding cleft formed by loops extending from the catalytic sub-domain. The catalytic sub-domain of DeltaRluD has a similar fold as in TruA, TruB and RsuA, with the location of the RNA-binding cleft, active-site and conserved, catalytic Asp residue superposing in all four structures. Superposition of the crystal structure of TruB bound to a T-stem loop with RluD reveals that similar RNA-protein interactions for the flipped-out uridine base would exist in both structures, implying that base-flipping is necessary for catalysis. This observation also implies that the specificity determinants for site-specific RNA-binding and recognition likely reside in parts of RluD beyond the active site. Crystal structure of the RluD pseudouridine synthase catalytic module, an enzyme that modifies 23S rRNA and is essential for normal cell growth of Escherichia coli.,Sivaraman J, Iannuzzi P, Cygler M, Matte A J Mol Biol. 2004 Jan 2;335(1):87-101. PMID:14659742 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Guide-independent Pseudouridine synthase Pseudouridine synthase 3D structures

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