PTP1B complexed with Isoxazole Carboxylic Acid

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.211 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Isoxazole carboxylic acids as protein tyrosine phosphatase 1B (PTP1B) inhibitors.

Zhao, H.Liu, G.Xin, Z.Serby, M.D.Pei, Z.Szczepankiewicz, B.G.Hajduk, P.J.Abad-Zapatero, C.Hutchins, C.W.Lubben, T.H.Ballaron, S.J.Haasch, D.L.Kaszubska, W.Rondinone, C.M.Trevillyan, J.M.Jirousek, M.R.

(2004) Bioorg Med Chem Lett 14: 5543-5546

  • DOI: https://doi.org/10.1016/j.bmcl.2004.08.063
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Guided by X-ray crystallography, we have extended the structure-activity relationship (SAR) study on an isoxazole carboxylic acid-based PTP1B inhibitor (1) and more potent and equally selective (>20-fold selectivity over the highly homologous T-cell PTPase, TCPTP) PTP1B inhibitors were identified. Inhibitor 7 demonstrated good cellular activity against PTP1B in COS 7 cells.

  • Organizational Affiliation

    Metabolic Disease Research, Global Pharmaceutical Research and Development, Abbott Laboratories, Abbott Park, IL 60064-6098, USA. hongyu.zhao@abbott.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein-tyrosine phosphatase, non-receptor type 1321Homo sapiensMutation(s): 0 
Gene Names: PTPN1PTP1B
UniProt & NIH Common Fund Data Resources
Find proteins for P18031 (Homo sapiens)
Explore P18031 
Go to UniProtKB:  P18031
GTEx:  ENSG00000196396 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP18031
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IX1

Download Ideal Coordinates CCD File 
C22 H19 N O8
Binding Affinity Annotations 
IDSourceBinding Affinity
IX1 PDBBind:  1XBO Ki: 920 (nM) from 1 assay(s)
BindingDB:  1XBO Ki: 920 (nM) from 1 assay(s)
IC50: 920 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.211 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.44α = 90
b = 88.44β = 90
c = 104.47γ = 120
Software Package:
Software NamePurpose
MAR345data collection
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-19
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2023-08-23
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description