1OES

Oxidation state of protein tyrosine phosphatase 1B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Oxidation State of the Active-Site Cysteine in Protein Tyrosine Phosphatase 1B

Van Montfort, R.L.M.Congreve, M.Tisi, D.Carr, R.Jhoti, H.

(2003) Nature 423: 773

  • DOI: 10.1038/nature01681
  • Primary Citation of Related Structures:  1OET, 1OEU, 1OEV

  • PubMed Abstract: 
  • Protein tyrosine phosphatases regulate signal transduction pathways involving tyrosine phosphorylation and have been implicated in the development of cancer, diabetes, rheumatoid arthritis and hypertension. Increasing evidence suggests that the cellu ...

    Protein tyrosine phosphatases regulate signal transduction pathways involving tyrosine phosphorylation and have been implicated in the development of cancer, diabetes, rheumatoid arthritis and hypertension. Increasing evidence suggests that the cellular redox state is involved in regulating tyrosine phosphatase activity through the reversible oxidization of the catalytic cysteine to sulphenic acid (Cys-SOH). But how further oxidation to the irreversible sulphinic (Cys-SO2H) and sulphonic (Cys-SO3H) forms is prevented remains unclear. Here we report the crystal structures of the regulatory sulphenic and irreversible sulphinic and sulphonic acids of protein tyrosine phosphatase 1B (PTP1B), an important enzyme in the negative regulation of the insulin receptor and a therapeutic target in type II diabetes and obesity. We also identify a sulphenyl-amide species that is formed through oxidation of its catalytic cysteine. Formation of the sulphenyl-amide causes large changes in the PTP1B active site, which are reversible by reduction with the cellular reducing agent glutathione. The sulphenyl-amide is a protective intermediate in the oxidative inhibition of PTP1B. In addition, it may facilitate reactivation of PTP1B by biological thiols and signal a unique state of the protein.


    Related Citations: 
    • Crystal Structure of Human Protein Tyrosine Phosphatase 1B
      Barford, D.,Flint, A.J.,Tonks, N.K.
      (1994) Science 263: 1397
    • Redox Regulation of Protein Tyrosine Phosphatase Involves a Sulfenyl-Amide Intermediate
      Salmeen, A.,Andersen, J.N.,Myers, M.P.,Meng, T.-C.,Hinks, J.A.,Tonks, N.K.,Barford, D.
      (2003) Nature 423: 769


    Organizational Affiliation

    Astex Technology Ltd, 436 Cambridge Science Park, Milton Road, Cambridge CB4 0QA, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN-TYROSINE PHOSPHATASE, NON-RECEPTOR TYPE 1
A
321Homo sapiensGene Names: PTPN1 (PTP1B)
EC: 3.1.3.48
Find proteins for P18031 (Homo sapiens)
Go to Gene View: PTPN1
Go to UniProtKB:  P18031
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.182 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 87.686α = 90.00
b = 87.686β = 90.00
c = 103.721γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-06-12
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance