4ohf | pdb_00004ohf

Crystal structure of cytosolic nucleotidase II (LPG0095) in complex with GMP from Legionella pneumophila, NORTHEAST STRUCTURAL GENOMICS CONSORTIUM TARGET LGR1

spinqualitylabelsall models 4ohf, resolution 2.53Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ohf is a 4 chain structure with sequence from Legph. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 5GP, MG, PO4 Related: 4g63 Gene: lpg0095 (LEGPH) Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Cytosolic nucleotidase II (cN-II) from Legionella pneumophila (Lp) catalyzes the hydrolysis of GMP and dGMP displaying sigmoidal curves, whereas catalysis of IMP hydrolysis displayed a biphasic curve in the initial rate versus substrate concentration plots. Allosteric modulators of mammalian cN-II did not activate LpcN-II although GTP, GDP and the substrate GMP were specific activators. Crystal structures of the tetrameric LpcN-II revealed an activator-binding site at the dimer interface. A double mutation in this allosteric-binding site abolished activation, confirming the structural observations. The substrate GMP acting as an activator, partitioning between the allosteric and active site, is the basis for the sigmoidicity of the initial velocity versus GMP concentration plot. The LpcN-II tetramer showed differences in subunit organization upon activator binding that are absent in the activator-bound human cN-II structure. This is the first observation of a structural change induced by activator binding in cN-II that may be the molecular mechanism for enzyme activation. DATABASE: The coordinates and structure factors reported in this paper have been submitted to the Protein Data Bank under the accession numbers 2BDE and 4G63. The accession number of GMP complexed LpcN-II is 4OHF. Allosteric regulation and substrate activation in cytosolic nucleotidase II from Legionella pneumophila.,Srinivasan B, Forouhar F, Shukla A, Sampangi C, Kulkarni S, Abashidze M, Seetharaman J, Lew S, Mao L, Acton TB, Xiao R, Everett JK, Montelione GT, Tong L, Balaram H FEBS J. 2014 Jan 24. doi: 10.1111/febs.12727. PMID:24456211 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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