3dpc

Structure of E.coli Alkaline Phosphatase Mutant in Complex with a Phosphorylated PeptideStructure of E.coli Alkaline Phosphatase Mutant in Complex with a Phosphorylated Peptide

Structural highlights 3dpc is a 3 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.3Å Ligands: , , Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PPB_ECOLI 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 This study describes the development of a universal phosphorylated peptide-binding protein designed to simultaneously detect serine, threonine and tyrosine kinases. The Escherichia coli alkaline phosphatase (EAP) is a well-defined nonspecific phosphated monoesterase and Ser-, Thr- or Tyr-phosphorylated peptides served as substrates for EAP in preliminary experiments. Based on the known catalytic mechanism of EAP, the recombinant site-directed mutant EAP-S102L was generated, whose catalytic activity was blocked, but its binding ability was preserved. For EAP-S102L the catalytic rate constant, k(cat), was reduced by a factor of 1000, while the Michaelis-Menten constant, K(m), remained almost unchanged. Crystallographic analysis of the EAP-S102L/phophorylated peptide complex revealed that EAP-S102L could bind the phosphate group of the phosphorylated peptide but lacked nucleophilic attack potential which was essential for the catalytic ability of EAP. Finally, by combining the fluorescence-labeled EAP-S102L with non-phophorylated peptide chips, kinases could be detected from tumor cell samples. The recombinant EAP-S102L construct is perhaps the first functional binding protein derived from a native enzyme, illustrating how one single mutation tremendously alters protein function. Development of a universal phosphorylated peptide-binding protein for simultaneous assay of kinases.,Li W, Bi L, Wang W, Li Y, Zhou Y, Wei H, Jiang T, Bai L, Chen Y, Zhang Z, Yuan X, Xiao J, Zhang XE Biosens Bioelectron. 2009 May 15;24(9):2871-7. Epub 2009 Mar 3. PMID:19349157 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Alkaline phosphatase 3D structures

spinqualitylabelsall models 3dpc, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image