2o6i

Structure of an Enterococcus Faecalis HD Domain Phosphohydrolase

spinqualitylabelsall models 2o6i, resolution 2.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2o6i is a 2 chain structure with sequence from Entfa. This structure supersedes the now removed PDB entry 2hon. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, HED, ZN Gene: EF-1143 (ENTFA) Resources: FirstGlance, OCA, RCSB, PDBsum, TOPSAN 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 EF1143 protein from Enterococcus faecalis is a distant homolog of deoxynucleotide triphosphate triphosphohydrolases (dNTPases) from Escherichia coli and Thermus thermophilus. These dNTPases are important components in the regulation of the dNTP pool in bacteria. Biochemical assays of the EF1143 dNTPase activity demonstrated nonspecific hydrolysis of all canonical dNTPs in the presence of Mn(2+). In contrast, with Mg(2+) hydrolysis required the presence of dGTP as an effector, activating the degradation of dATP and dCTP with dGTP also being consumed in the reaction with dATP. The crystal structure of EF1143 and dynamic light scattering measurements in solution revealed a tetrameric oligomer as the most probable biologically active unit. The tetramer contains four dGTP specific allosteric regulatory sites and four active sites. Examination of the active site with the dATP substrate suggests an in-line nucleophilic attack on the alpha-phosphate center as a possible mechanism of the hydrolysis and two highly conserved residues, His-129 and Glu-122, as an acid-base catalytic dyad. Structural differences between EF1143 apo and holo forms revealed mobility of the alpha3 helix that can regulate the size of the active site binding pocket and could be stabilized in the open conformation upon formation of the tetramer and dGTP effector binding. Characterization of the deoxynucleotide triphosphate triphosphohydrolase (dNTPase) activity of the EF1143 protein from Enterococcus faecalis and crystal structure of the activator-substrate complex.,Vorontsov II, Minasov G, Kiryukhina O, Brunzelle JS, Shuvalova L, Anderson WF J Biol Chem. 2011 Sep 23;286(38):33158-66. Epub 2011 Jul 13. PMID:21757692 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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