3mk1

Refinement of placental alkaline phosphatase complexed with nitrophenyl

spinqualitylabelsall models 3mk1, resolution 1.57Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3mk1 is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, CA, MG, NA, NAG, NPO, PO4, ZN NonStd Res: SEP Related: 1zed, 3mk0, 3mk2 Activity: Alkaline phosphatase, with EC number 3.1.3.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The activity of human placental alkaline phosphatase (PLAP) is downregulated by a number of effectors such as l-phenylalanine, an uncompetitive inhibitor, 5'-AMP, an antagonist of the effects of PLAP on fibroblast proliferation and by p-nitrophenyl-phosphonate (PNPPate), a non-hydrolysable substrate analogue. For the first two, such regulation may be linked to its biological function that requires a reduced and better-regulated hydrolytic rate. To understand how such disparate ligands are able to inhibit the enzyme, we solved the structure of the complexes at 1.6A, 1.9A and 1.9A resolution, respectively. These crystal structures are the first of an alkaline phosphatase in complex with organic inhibitors. Of the three inhibitors, only l-Phe and PNPPate bind at the active site hydrophobic pocket, providing structural data on the uncompetitive inhibition process. In contrast, all three ligands interact at a remote peripheral site located 28A from the active site. In order to extend these observations to the other members of the human alkaline phosphatase family, we have modelled the structures of the other human isozymes and compared them to PLAP. This comparison highlights the crucial role played by position 429 at the active site in the modulation of the catalytic process, and suggests that the peripheral binding site may be involved in the functional specialization of the PLAP isozyme. Structural studies of human placental alkaline phosphatase in complex with functional ligands.,Llinas P, Stura EA, Menez A, Kiss Z, Stigbrand T, Millan JL, Le Du MH J Mol Biol. 2005 Jul 15;350(3):441-51. PMID:15946677 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Alkaline phosphatase

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