2b4p | pdb_00002b4p

Structure of the D223N mutant of Selenomonas ruminantium PTP-like phytase

spinqualitylabelsall models 2b4p, resolution 1.81Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2b4p is a 2 chain structure with sequence from "ancyromonas_ruminantium"_certes_1889 "ancyromonas ruminantium" certes 1889. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, MLI Related: 1u24, 1u25, 1u26, 2b40, 2b4u Gene: phyasr_R252K ("Ancyromonas ruminantium" Certes 1889) Activity: 5-phytase, with EC number 3.1.3.72 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 PhyA from Selenomonas ruminantium (PhyAsr), is a bacterial protein tyrosine phosphatase (PTP)-like inositol polyphosphate phosphatase (IPPase) that is distantly related to known PTPs. PhyAsr has a second substrate binding site referred to as a standby site and the P-loop (HCX5R) has been observed in both open (inactive) and closed (active) conformations. Site-directed mutagenesis and kinetic and structural studies indicate PhyAsr follows a classical PTP mechanism of hydrolysis and has a broad specificity toward polyphosphorylated myo-inositol substrates, including phosphoinositides. Kinetic and molecular docking experiments demonstrate PhyAsr preferentially cleaves the 3-phosphate position of Ins P6 and will produce Ins(2)P via a highly ordered series of sequential dephosphorylations: D-Ins(1,2,4,5,6)P5, Ins(2,4,5,6)P4, D-Ins(2,4,5)P3, and D-Ins(2,4)P2. The data support a distributive enzyme mechanism and suggest the PhyAsr standby site is involved in the recruitment of substrate. Structural studies at physiological pH and high salt concentrations demonstrate the "closed" or active P-loop conformation can be induced in the absence of substrate. These results suggest PhyAsr should be reclassified as a D-3 myo-inositol hexakisphosphate phosphohydrolase and suggest the PhyAsr reaction mechanism is more similar to that of PTPs than previously suspected. Kinetic and structural analysis of a bacterial protein tyrosine phosphatase-like myo-inositol polyphosphatase.,Puhl AA, Gruninger RJ, Greiner R, Janzen TW, Mosimann SC, Selinger LB Protein Sci. 2007 Jul;16(7):1368-78. Epub 2007 Jun 13. PMID:17567745 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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