2bqx

Inorganic Pyrophosphatase from the Pathogenic Bacterium Helicobacter pylori-Kinetic and Structural Properties

spinqualitylabelsall models 2bqx, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2bqx is a 1 chain structure with sequence from Helicobacter pylori 26695. 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 IPYR_HELPY 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 Inorganic pyrophosphatase (PPase) catalyzes the hydrolysis of pyrophosphate (PPi) to orthophosphate (Pi) and controls the level of PPi in cells. PPase plays an essential role in energy conservation and provides the energy for many biosynthetic pathways. The Helicobacter pylori pyrophosphatase (HpPPase) gene was cloned, expressed, purified, and found to have a molecular weight of 20 kDa. The K(m) and V (max) of HpPPase were determined as 214.4 microM and 594 micromol Pi min(-1) mg(-1), respectively. PPi binds Mg(2+) to form a true substrate that activates the enzyme. However, free PPi could be a potent inhibitor for HpPPase. The effects of the inhibitors NaF, ATP, iminodiphosphate, and N-ethylmaleimide on HpPPase activity were evaluated. NaF showed the highest inhibition of the enzyme. Crystal structures of HpPPase and the PPi-HpPPase complex were determined. HpPPase comprises three alpha-helices and nine beta-strands and folds as a barrel structure. HpPPase forms a hexamer in both the solution and crystal states, and each monomer has its own PPi-binding site. The PPi binding does not cause a significant conformational change in the PPi-HpPPase complex, which might represent an inhibition state for HpPPase in the absence of a divalent metal ion. Kinetic and structural properties of inorganic pyrophosphatase from the pathogenic bacterium Helicobacter pylori.,Chao TC, Huang H, Tsai JY, Huang CY, Sun YJ Proteins. 2006 Nov 15;65(3):670-80. PMID:16988955 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Inorganic pyrophosphatase 3D structures

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