2CNH

Structural Insights into the Design of Nonpeptidic Isothiazolidinone- Containing Inhibitors of Protein Tyrosine Phosphatase 1B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Insights Into the Design of Nonpeptidic Isothiazolidinone-Containing Inhibitors of Protein- Tyrosine Phosphatase 1B.

Ala, P.J.Gonneville, L.Hillman, M.Becker-Pasha, M.Yue, E.W.Douty, B.Wayland, B.Polam, P.Crawley, M.L.Mclaughlin, E.Sparks, R.B.Glass, B.Takvorian, A.Combs, A.P.Burn, T.C.Hollis, G.F.Wynn, R.

(2006) J.Biol.Chem. 281: 38013

  • DOI: 10.1074/jbc.M607913200
  • Primary Citation of Related Structures:  2CNE, 2CNF, 2CNG, 2CNI

  • PubMed Abstract: 
  • Structural analyses of the protein-tyrosine phosphatase 1B (PTP1B) active site and inhibitor complexes have aided in optimization of a peptide inhibitor containing the novel (S)-isothiazolidinone (IZD) phosphonate mimetic. Potency and permeability we ...

    Structural analyses of the protein-tyrosine phosphatase 1B (PTP1B) active site and inhibitor complexes have aided in optimization of a peptide inhibitor containing the novel (S)-isothiazolidinone (IZD) phosphonate mimetic. Potency and permeability were simultaneously improved by replacing the polar peptidic backbone of the inhibitor with nonpeptidic moieties. The C-terminal primary amide was replaced with a benzimidazole ring, which hydrogen bonds to the carboxylate of Asp(48), and the N terminus of the peptide was replaced with an aryl sulfonamide, which hydrogen bonds to Asp(48) and the backbone NH of Arg(47) via a water molecule. Although both substituents retain the favorable hydrogen bonding network of the peptide scaffold, their aryl rings interact weakly with the protein. The aryl ring of benzimidazole is partially solvent exposed and only participates in van der Waals interactions with Phe(182) of the flap. The aryl ring of aryl sulfonamide adopts an unexpected conformation and only participates in intramolecular pi-stacking interactions with the benzimidazole ring. These results explain the flat SAR for substitutions on both rings and the reason why unsubstituted moieties were selected as candidates. Finally, substituents ortho to the IZD heterocycle on the aryl ring of the IZD-phenyl moiety bind in a small narrow site adjacent to the primary phosphate binding pocket. The crystal structure of an o-chloro derivative reveals that chlorine interacts extensively with residues in the small site. The structural insights that have led to the discovery of potent benzimidazole aryl sulfonamide o-substituted derivatives are discussed in detail.


    Organizational Affiliation

    Incyte Corporation, Wilmington, Delaware 19880, USA. pauljala@gmail.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TYROSINE-PROTEIN 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 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
IZB
Query on IZB

Download SDF File 
Download CCD File 
A
N-[(1S)-1-(1H-BENZIMIDAZOL-2-YL)-2-{4-[(5S)-1,1-DIOXIDO-3-OXOISOTHIAZOLIDIN-5-YL]PHENYL}ETHYL]-4-METHYL-3,4-DIHYDRO-2H-1,4-BENZOXAZINE-7-SULFONAMIDE
C27 H27 N5 O6 S2
QNAGNPUNGCBSIJ-DHLKQENFSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
IZBIC50: 59 nM (100) BINDINGDB
IZBIC50: 59 nM BINDINGMOAD
IZBIC50: 59 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 66.900α = 90.00
b = 71.410β = 90.00
c = 87.580γ = 90.00
Software Package:
Software NamePurpose
CNXrefinement
CNXphasing
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-09-27
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-07-05
    Type: Data collection