5pnt

CRYSTAL STRUCTURE OF A HUMAN LOW MOLECULAR WEIGHT PHOSPHOTYROSYL PHOSPHATASE. IMPLICATIONS FOR SUBSTRATE SPECIFICITY

spinqualitylabelsall models 5pnt, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5pnt 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: MES Activity: Acid phosphatase, with EC number 3.1.3.2 Resources: FirstGlance, OCA, RCSB, PDBsum Function [PPAC_HUMAN] Acts on tyrosine phosphorylated proteins, low-MW aryl phosphates and natural and synthetic acyl phosphates. Isoform 3 does not possess phosphatase activity. 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 low molecular weight phosphotyrosine phosphatases (PTPases) constitute a distinctive class of phosphotyrosine phosphatases that is widely distributed among vertebrate and invertebrate organisms. In vertebrates, two isoenzymes of these low molecular weight PTPases are commonly expressed. The two human isoenzymes, HCPTPA and HCPTPB, differ in an alternatively spliced sequence (residues 40-73) referred to as the variable loop, resulting in isoenzymes that have different substrate specificities and inhibitor/activator responses. We present here the x-ray crystallographic structure of a human low molecular weight PTPase solved by molecular replacement to 2.2 A. The structure of human low molecular weight PTPase is compared with a structure representing the other isoenzyme in this PTPase class, in each case with a sulfonate inhibitor bound to the active site. Possible aromatic residue interactions with the phosphotyrosine substrate are proposed from an examination of the binding site of the inhibitors. Differences are observed in the variable loop region, which forms one wall and the floor of a long crevice leading from the active-site loop. A set of residues lying along this crevice (amino acids 49, 50, and 53) is suggested to be responsible for differences in substrate specificity in these two enzymes. Crystal structure of a human low molecular weight phosphotyrosyl phosphatase. Implications for substrate specificity.,Zhang M, Stauffacher CV, Lin D, Van Etten RL J Biol Chem. 1998 Aug 21;273(34):21714-20. PMID:9705307 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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