3I80

Protein Tyrosine Phosphatase 1B - Transition state analog for the second catalytic step


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Insights into the reaction of protein-tyrosine phosphatase 1B: crystal structures for transition state analogs of both catalytic steps.

Brandao, T.A.Hengge, A.C.Johnson, S.J.

(2010) J Biol Chem 285: 15874-15883

  • DOI: https://doi.org/10.1074/jbc.M109.066951
  • Primary Citation of Related Structures:  
    3I7Z, 3I80

  • PubMed Abstract: 

    Catalysis by protein-tyrosine phosphatase 1B (PTP1B) occurs through a two-step mechanism involving a phosphocysteine intermediate. We have solved crystal structures for the transition state analogs for both steps. Together with previously reported crystal structures of apo-PTP1B, the Michaelis complex of an inactive mutant, the phosphoenzyme intermediate, and the product complex, a full picture of all catalytic steps can now be depicted. The transition state analog for the first catalytic step comprises a ternary complex between the catalytic cysteine of PTP1B, vanadate, and the peptide DADEYL, a fragment of a physiological substrate. The equatorial vanadate oxygen atoms bind to the P-loop, and the apical positions are occupied by the peptide tyrosine oxygen and by the PTP1B cysteine sulfur atom. The vanadate assumes a trigonal bipyramidal geometry in both transition state analog structures, with very similar apical O-O distances, denoting similar transition states for both phosphoryl transfer steps. Detailed interactions between the flanking peptide and the enzyme are discussed.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322-0300, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosine-protein phosphatase non-receptor type 1321Homo sapiensMutation(s): 0 
Gene Names: PTP1BPTPN1
EC: 3.1.3.48
UniProt & NIH Common Fund Data Resources
Find proteins for P18031 (Homo sapiens)
Explore P18031 
Go to UniProtKB:  P18031
PHAROS:  P18031
GTEx:  ENSG00000196396 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP18031
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.84α = 90
b = 87.84β = 90
c = 103.79γ = 120
Software Package:
Software NamePurpose
d*TREKdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
d*TREKdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-03-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description