1C0E

Active Site S19A Mutant of Bovine Heart Phosphotyrosyl Phosphatase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structure of the bovine protein tyrosine phosphatase dimer reveals a potential self-regulation mechanism.

Tabernero, L.Evans, B.N.Tishmack, P.A.Van Etten, R.L.Stauffacher, C.V.

(1999) Biochemistry 38: 11651-11658


  • PubMed Abstract: 
  • 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 mot ...

    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.


    Related Citations: 
    • Structure of Bovine Heart Phosphotyrosyl Phosphatase at 2.2 Angstroms Resolution
      Zhang, M.,Van Etten, R.L.,Stauffacher, C.V.
      (1994) Biochemistry 33: 11097


    Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (TYROSINE PHOSPHATASE (ORTHOPHOSPHORIC MONOESTER PHOSPHOHYDROLASE))
A, B
157Bos taurusGene Names: ACP1
EC: 3.1.3.48, 3.1.3.2
Find proteins for P11064 (Bos taurus)
Go to Gene View: ACP1
Go to UniProtKB:  P11064
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 43.320α = 90.00
b = 55.470β = 90.00
c = 131.450γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-09-28
    Type: Initial release
  • Version 1.1: 2007-10-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance