1wpp

Structure of Streptococcus gordonii inorganic pyrophosphatase

spinqualitylabelsall models 1wpp, resolution 2.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1wpp is a 2 chain structure with sequence from Strgc. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, SO4, ZN Related: 1wpm, 1wpn Activity: Inorganic diphosphatase, with EC number 3.6.1.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 Family II inorganic pyrophosphatases (PPases) constitute a new evolutionary group of PPases, with a different fold and mechanism than the common family I enzyme; they are related to the "DHH" family of phosphoesterases. Biochemical studies have shown that Mn(2+) and Co(2+) preferentially activate family II PPases; Mg(2+) partially activates; and Zn(2+) can either activate or inhibit (Zyryanov et al., Biochemistry, 43, 14395-14402, accompanying paper in this issue). The three solved family II PPase structures did not explain the differences between the PPase families nor the metal ion differences described above. We therefore solved three new family II PPase structures: Bacillus subtilis PPase (Bs-PPase) dimer core bound to Mn(2+) at 1.3 A resolution, and, at 2.05 A resolution, metal-free Bs-PPase and Streptococcus gordonii (Sg-PPase) containing sulfate and Zn(2+). Comparison of the new and old structures of various family II PPases demonstrates why the family II enzyme prefers Mn(2+) or Co(2+), as an activator rather than Mg(2+). Both M1 and M2 undergo significant changes upon substrate binding, changing from five-coordinate to octahedral geometry. Mn(2+) and Co(2+), which readily adopt different coordination states and geometries, are thus favored. Combining our structures with biochemical data, we identified M2 as the high-affinity metal site. Zn(2+) activates in the M1 site, where octahedral geometry is not essential for catalysis, but inhibits in the M2 site, because it is unable to assume octahedral geometry but remains trigonal bipyramidal. Finally, we propose that Lys205-Gln81-Gln80 form a hydrophilic channel to speed product release from the active site. Structural studies of metal ions in family II pyrophosphatases: the requirement for a Janus ion.,Fabrichniy IP, Lehtio L, Salminen A, Zyryanov AB, Baykov AA, Lahti R, Goldman A Biochemistry. 2004 Nov 16;43(45):14403-11. PMID:15533045 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Inorganic pyrophosphatase

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