1LQF

Structure of PTP1b in Complex with a Peptidic Bisphosphonate Inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

The structure of PTP-1B in complex with a peptide inhibitor reveals an alternative binding mode for bisphosphonates.

Asante-Appiah, E.Patel, S.Dufresne, C.Roy, P.Wang, Q.Patel, V.Friesen, R.W.Ramachandran, C.Becker, J.W.Leblanc, Y.Kennedy, B.P.Scapin, G.

(2002) Biochemistry 41: 9043-9051

  • DOI: https://doi.org/10.1021/bi0259554
  • Primary Citation of Related Structures:  
    1LQF

  • PubMed Abstract: 

    Inhibitors of PTP-1B could be therapeutically beneficial in the treatment of type 2 diabetes. Owing to the large number of phosphatases in the cell, inhibitors against PTP-1B must not only be potent but selective as well. N-Benzoyl-L-glutamyl-[4-phosphono(difluoromethyl)]-L-phenylalanine-[4-phosphono(difluoro-methyl)]-L-phenylalanineamide (BzN-EJJ-amide) is a low nanomolar inhibitor of PTP-1B that shows selectivity over several protein tyrosine phosphatases. To gain an insight into the basis of its potency and selectivity, we evaluated several analogues of the inhibitor and introduced amino acid substitutions into PTP-1B by site-directed mutagenesis. We also determined the crystal structure of PTP-1B in complex with BzN-EJJ-amide at 2.5 A resolution. Our results indicate that the high inhibitory potency is due to interactions of several of its chemical groups with specific protein residues. An interaction between BzN-EJJ-amide and Asp48 is of particular significance, as substitution of Asp48 to alanine resulted in a 100-fold loss in potency. The crystal structure also revealed an unexpected binding orientation for a bisphosphonate inhibitor on PTP-1B, where the second difluorophosphonomethyl phenylalanine (F(2)PMP) moiety is bound close to Arg47 rather than in the previously identified second aryl phosphate site demarked by Arg24 and Arg254. Our results suggest that potent and selective PTP-1B inhibitors may be designed by targeting the region containing Arg47 and Asp48.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Merck Frosst Center for Therapeutic Research, Pointe-Claire - Dorval H9R 4P8, Canada. Ernest_Asanteappiah@Merck.com


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
protein-tyrosine phosphatase, non-receptor type 1
A, B, C, D
295Homo sapiensMutation(s): 0 
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
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 186.866α = 90
b = 154.421β = 94.56
c = 64.598γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
MAR345data collection
X-GENdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-07-24
    Type: Initial release
  • Version 1.1: 2008-04-28
    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: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description