Active Site S19A Mutant of Bovine Heart Phosphotyrosyl Phosphatase

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 

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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

  • DOI: https://doi.org/10.1021/bi990381x
  • Primary Citation of Related Structures:  

  • 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 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.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
157Bos taurusMutation(s): 1 
Find proteins for P11064 (Bos taurus)
Explore P11064 
Go to UniProtKB:  P11064
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11064
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PO4

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
O4 P
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.32α = 90
b = 55.47β = 90
c = 131.45γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-09-28
    Type: Initial release
  • Version 1.1: 2007-10-21
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations
  • Version 1.4: 2024-02-07
    Changes: Data collection