1z12

Crystal Structure of Bovine Low Molecular Weight PTPase Complexed with Vanadate

spinqualitylabelsall models 1z12, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1z12 is a 1 chain structure with sequence from Bos taurus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: VO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PPAC_BOVIN Acts on tyrosine phosphorylated proteins, low-MW aryl phosphates and natural and synthetic acyl phosphates. 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 early transition metal oxoanions vanadate, molybdate, and tungstate are widely used inhibitors for phosphatase enzymes. These oxoanions could inhibit such enzymes by simply mimicking the tetrahedral geometry of phosphate ion. However, in some cases, the enzyme-inhibitor dissociation constants (Ki) for these oxoanions are much lower than that for phosphate. Such observations gave rise to the hypothesis that in some cases these transition metal oxoanions may inhibit phosphomonoesterases by forming complexes that resemble the trigonal bipyramidal geometry of the SN2(P) transition state. As a test of this, the crystal structures of a low molecular weight protein tyrosine phosphatase at pH 7.5 complexed with the inhibitors vanadate and molybdate were solved at 2.2 A resolution and compared to a newly refined 1.9 A structure of the enzyme. Geometric restraints on the oxoanions were relaxed during refinement in order to minimize model bias. Both inhibitors were bound at the active site, and the overall protein structures were left unchanged, although some small but significant side chain movements at the active site were observed. Vanadate ion formed a covalent linkage with the nucleophile Cys12 at the active site and exhibited a trigonal bipyramidal geometry. In contrast, simple tetrahedral geometry was observed for the weaker molybdate complex. These studies are consistent with the conclusion that vanadate inhibits tyrosine phosphatases by acting as a transition state analog. The structure of the vanadate complex may be expected to closely resemble the transition state for reactions catalyzed by protein tyrosine phosphatases. Crystal structure of bovine low molecular weight phosphotyrosyl phosphatase complexed with the transition state analog vanadate.,Zhang M, Zhou M, Van Etten RL, Stauffacher CV Biochemistry. 1997 Jan 7;36(1):15-23. PMID:8993313 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Acid phosphatase 3D structures Tyrosine phosphatase 3D structures

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