A potent and selective small-molecule inhibitor for the lymphoid-specific tyrosine phosphatase (LYP), a target associated with autoimmune diseases

J Med Chem. 2013 Jun 27;56(12):4990-5008. doi: 10.1021/jm400248c. Epub 2013 Jun 6.


Lymphoid-specific tyrosine phosphatase (LYP), a member of the protein tyrosine phosphatase (PTP) family of signaling enzymes, is associated with a broad spectrum of autoimmune diseases. Herein we describe our structure-based lead optimization efforts within a 6-hydroxy-benzofuran-5-carboxylic acid series culminating in the identification of compound 8b, a potent and selective inhibitor of LYP with a K(i) value of 110 nM and more than 9-fold selectivity over a large panel of PTPs. The structure of LYP in complex with 8b was obtained by X-ray crystallography, providing detailed information about the molecular recognition of small-molecule ligands binding LYP. Importantly, compound 8b possesses highly efficacious cellular activity in both T- and mast cells and is capable of blocking anaphylaxis in mice. Discovery of 8b establishes a starting point for the development of clinically useful LYP inhibitors for treating a wide range of autoimmune disorders.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anaphylaxis / drug therapy
  • Animals
  • Autoimmune Diseases / drug therapy*
  • Carboxylic Acids / chemistry
  • Down-Regulation / drug effects
  • Female
  • Humans
  • Jurkat Cells
  • Lymphocyte Activation / drug effects
  • Mast Cells / drug effects
  • Mast Cells / immunology
  • Mice
  • Models, Molecular
  • Molecular Targeted Therapy*
  • Protein Conformation
  • Protein Kinase Inhibitors / chemistry
  • Protein Kinase Inhibitors / pharmacology*
  • Protein Kinase Inhibitors / therapeutic use
  • Protein-Tyrosine Kinases / antagonists & inhibitors*
  • Small Molecule Libraries / chemistry
  • Small Molecule Libraries / pharmacology*
  • Small Molecule Libraries / therapeutic use


  • Carboxylic Acids
  • Protein Kinase Inhibitors
  • Small Molecule Libraries
  • Protein-Tyrosine Kinases

Associated data

  • PDB/4J51