1JF7

HUMAN PTP1B CATALYTIC DOMAIN COMPLEXED WITH PNU177836


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Synthesis and biological activity of a novel class of small molecular weight peptidomimetic competitive inhibitors of protein tyrosine phosphatase 1B.

Larsen, S.D.Barf, T.Liljebris, C.May, P.D.Ogg, D.O'Sullivan, T.J.Palazuk, B.J.Schostarez, H.J.Stevens, F.C.Bleasdale, J.E.

(2002) J.Med.Chem. 45: 598-622


  • PubMed Abstract: 
  • Protein tyrosine phosphatase 1B (PTP1B) negatively regulates insulin signaling in part by dephosphorylating key tyrosine residues within the regulatory domain of the beta-subunit of the insulin receptor (IR), thereby attenuating receptor tyrosine kin ...

    Protein tyrosine phosphatase 1B (PTP1B) negatively regulates insulin signaling in part by dephosphorylating key tyrosine residues within the regulatory domain of the beta-subunit of the insulin receptor (IR), thereby attenuating receptor tyrosine kinase activity. Inhibition of PTP1B is therefore anticipated to improve insulin resistance and has recently become the focus of discovery efforts aimed at identifying new drugs to treat type II diabetes. We previously reported that the tripeptide Ac-Asp-Tyr(SO(3)H)-Nle-NH(2) is a surprisingly effective inhibitor of PTP1B (K(i) = 5 microM). With the goal of improving the stability and potency of this lead, as well as attenuating its peptidic character, an analogue program was undertaken. Specific elements of the initial phase of this program included replacement of the N- and C-termini with non-amino acid components, modification of the tyrosine subunit, and replacement of the tyrosine sulfate with other potential phosphate mimics. The most potent analogue arising from this effort was triacid 71, which inhibits PTP1B competitively with a K(i) = 0.22 microM without inhibiting SHP-2 or LAR at concentrations up to 100 microM. Overall, the inhibitors generated in this work showed little or no enhancement of insulin signaling in cellular assays. However, potential prodrug triester 70 did induce enhancements in 2-deoxyglucose uptake into two different cell lines with concomitant augmentation of the tyrosine phosphorylation levels of insulin-signaling molecules. Key elements of the overall SAR reported herein include confirmation of the effectiveness and remarkable PTP1B-specificity of the novel tyrosine phosphate bioisostere, O-carboxymethyl salicylic acid; demonstration that the tyrosine skeleton is optimal relative to closely related structures; replacement of the p-1 aspartic acid with phenylalanine with little effect on activity; and demonstration that inhibitory activity can be maintained in the absence of an N-terminal carboxylic acid. An X-ray cocrystal structure of an analogue bearing a neutral N-terminus (69) bound to PTP1B is reported that confirms a mode of binding similar to that of peptidic substrates.


    Organizational Affiliation

    Department of Medicinal Chemistry, Pharmacia Corporation, Kalamazoo, Michigan 49007, USA. scott.d.larsen@pharmacia.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN-TYROSINE PHOSPHATASE 1B
A, B
298Homo 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
TBH
Query on TBH

Download SDF File 
Download CCD File 
B
5-(2-{2-[(TERT-BUTOXY-HYDROXY-METHYL)-AMINO]-1-HYDROXY-3-PHENYL-PROPYLAMINO}-3-HYDROXY-3-PENTYLAMINO-PROPYL)-2-CARBOXYMETHOXY-BENZOIC ACID
PNU177836
C31 H47 N3 O9
WVFJFYADATXBBE-JIFQQKSFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 60.595α = 90.00
b = 88.266β = 107.38
c = 65.786γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-02-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance