1c0e

Active Site S19A Mutant of Bovine Heart Phosphotyrosyl Phosphatase

spinqualitylabelsall models 1c0e, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1c0e is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: PO4 Related: 1pnt, 5pnt Activity: Acid phosphatase, with EC number 3.1.3.2 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 bovine protein tyrosine phosphatase (BPTP) is a member of the class of low-molecular weight protein tyrosine phosphatases (PTPases) found to be ubiquitous in mammalian cells. The catalytic site of BPTP contains a CX(5)R(S/T) phosphate-binding motif or P-loop (residues 12-19) which is the signature sequence for all PTPases. Ser19, the final residue of the P-loop motif, interacts with the catalytic Cys12 and participates in stabilizing the conformation of the active site through interactions with Asn15, also in the P-loop. Mutations at Ser19 result in an enzyme with altered kinetic properties with changes in the pK(a) of the neighboring His72. The X-ray structure of the S19A mutant enzyme shows that the general conformation of the P-loop is preserved. However, changes in the loop containing His72 result in a displacement of the His72 side chain that may explain the shift in the pK(a). In addition, it was found that in the crystal, the protein forms a dimer in which Tyr131 and Tyr132 from one monomer insert into the active site of the other monomer, suggesting a dual-tyrosine motif on target sites for this enzyme. Since the activity of this PTPase is reportedly regulated by phosphorylation at Tyr131 and Tyr132, the structure of this dimer may provide a model of a self-regulation mechanism for the low-molecular weight PTPases. The structure of the bovine protein tyrosine phosphatase dimer reveals a potential self-regulation mechanism.,Tabernero L, Evans BN, Tishmack PA, Van Etten RL, Stauffacher CV Biochemistry. 1999 Sep 7;38(36):11651-8. PMID:10512620 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Tyrosine phosphatase

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