3l8f

Crystal Structure of D,D-heptose 1.7-bisphosphate phosphatase from E. Coli complexed with magnesium and phosphate

spinqualitylabelsall models 3l8f, resolution 1.79Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3l8f is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG, PO4, ZN NonStd Res: MSE Related: 3l8e, 3l8g, 3l8h Gene: b0200, gmhB, JW0196, yaeD (Escherichia coli) Resources: FirstGlance, OCA, RCSB, PDBsum Function [GMHB_ECOLI] Converts the D-glycero-beta-D-manno-heptose 1,7-bisphosphate intermediate into D-glycero-beta-D-manno-heptose 1-phosphate (HBP) by removing the phosphate group at the C-7 position. Also catalyzes the dephosphorylation of fructose-1,6-bisphosphate (Fru1,6bisP). 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 haloalkanoic acid dehalogenase (HAD) enzyme superfamily is the largest family of phosphohydrolases. In HAD members, the structural elements that provide the binding interactions that support substrate specificity are separated from those that orchestrate catalysis. For most HAD phosphatases, a cap domain functions in substrate recognition. However, for the HAD phosphatases that lack a cap domain, an alternate strategy for substrate selection must be operative. One such HAD phosphatase, GmhB of the HisB subfamily, was selected for structure-function analysis. Herein, the X-ray crystallographic structures of Escherichia coli GmhB in the apo form (1.6 A resolution), in a complex with Mg(2+) and orthophosphate (1.8 A resolution), and in a complex with Mg(2+) and d-glycero-d-manno-heptose 1beta,7-bisphosphate (2.2 A resolution) were determined, in addition to the structure of Bordetella bronchiseptica GmhB bound to Mg(2+) and orthophosphate (1.7 A resolution). The structures show that in place of a cap domain, the GmhB catalytic site is elaborated by three peptide inserts or loops that pack to form a concave, semicircular surface around the substrate leaving group. Structure-guided kinetic analysis of site-directed mutants was conducted in parallel with a bioinformatics study of sequence diversification within the HisB subfamily to identify loop residues that serve as substrate recognition elements and that distinguish GmhB from its subfamily counterpart, the histidinol-phosphate phosphatase domain of HisB. We show that GmhB and the histidinol-phosphate phosphatase domain use the same design of three substrate recognition loops inserted into the cap domain yet, through selective residue usage on the loops, have achieved unique substrate specificity and thus novel biochemical function. Structural Determinants of Substrate Recognition in the HAD Superfamily Member d-glycero-d-manno-Heptose-1,7-bisphosphate Phosphatase (GmhB) .,Nguyen HH, Wang L, Huang H, Peisach E, Dunaway-Mariano D, Allen KN Biochemistry. 2010 Jan 22. PMID:20050614 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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