2o5f

Crystal Structure of DR0079 from Deinococcus radiodurans at 1.9 Angstrom Resolution

spinqualitylabelsall models 2o5f, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2o5f is a 2 chain structure with sequence from Deinococcus radiodurans R1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Y079_DEIRA Hydrolase that converts various nucleotide triphosphates (NTPs) to the corresponding nucleotide monophosphates and diphosphate, and nucleotide diphosphates to nucleotide monophosphates and inorganic phosphate. Has a marked preference for cytosine ribonucleoside 5'-diphosphate (CDP) and cytosine ribonucleoside 5'-triphosphate (CTP). Has lower activity towards the deoxyribose nucleotides dCDP and dCTP, and towards dGDP, TDP and UDP. 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 The genome of the extremely radiation resistant bacterium Deinococcus radiodurans encodes 21 Nudix hydrolases, of which only two have been characterized in detail. Here we report the activity and crystal structure for DR_0079, the first Nudix hydrolase observed to have a marked preference for cytosine ribonucleoside 5'-diphosphate (CDP) and cytosine ribonucleoside 5'-triphosphate (CTP). After CDP and CTP, the next most preferred substrates for DR_0079, with a relative activity of <50%, were the corresponding deoxyribose nucleotides, dCDP and dCTP. Hydrolase activity at the site of the phosphodiester bond was corroborated using (31)P NMR spectroscopy to follow the phosphorus resonances for three substrates, CDP, IDP, and CTP, and their hydrolysis products, CMP + P i, IMP + P i, and CMP + PP i, respectively. Nucleophilic substitution at the beta-phosphorus of CDP and CTP was established, using (31)P NMR spectroscopy, by the appearance of an upfield-shifted P i resonance and line-broadened PP i resonance, respectively, when the hydrolysis was performed in 40% H 2 (18)O-enriched water. The optimal activity for CDP was at pH 9.0-9.5 with the reaction requiring divalent metal cation (Mg (2+) > Mn (2+) > Co (2+)). The biochemical data are discussed with reference to the crystal structure for DR_0079 that was determined in the metal-free form at 1.9 A resolution. The protein contains nine beta-strands, three alpha-helices, and two 3 10-helices organized into three subdomains: an N-terminal beta-sheet, a central Nudix core, and a C-terminal helix-turn-helix motif. As observed for all known structures of Nudix hydrolases, the alpha-helix of the "Nudix box" is one of two helices that sandwich a "four-strand" mixed beta-sheet. To identify residues potentially involved in metal and substrate binding, NMR chemical shift mapping experiments were performed on (15)N-labeled DR_0079 with the paramagnetic divalent cation Co (2+) and the nonhydrolyzable substrate thymidine 5'- O-(alpha,beta-methylenediphosphate) and the results mapped onto the crystal structure. Functional and Structural Characterization of DR_0079 from Deinococcus radiodurans, a Novel Nudix Hydrolase with a Preference for Cytosine (Deoxy)ribonucleoside 5'-Di- and Triphosphates.,Buchko GW, Litvinova O, Robinson H, Yakunin AF, Kennedy MA Biochemistry. 2008 May 31;. PMID:18512963 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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