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Updated: Jun 10, 2026

Assessment of Resistance to Tyrosine Kinase Inhibitors by an Interrogation of Signal Transduction Pathways by Antibody Arrays
07:42

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Activity-based high-throughput determination of PTPs substrate specificity using a phosphopeptide microarray.

Liqian Gao1, Hongyan Sun, Shao Q Yao

  • 1Department of Chemistry, Program of the Life Sciences Institute, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.

Biopolymers
|August 21, 2010
PubMed
Summary
This summary is machine-generated.

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This study developed a phosphopeptide microarray to identify novel substrates for protein tyrosine phosphatases (PTPs). This high-throughput method aids in understanding PTP roles in diseases and designing targeted inhibitors.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Protein tyrosine phosphatases (PTPs) are crucial enzymes in cellular signaling pathways.
  • Dysregulated PTP activity is implicated in various human diseases, including cancer.
  • Identifying PTP substrates is essential for understanding their biological functions.

Purpose of the Study:

  • To develop a phosphopeptide microarray for high-throughput screening of PTP substrates.
  • To identify novel substrates for different PTPs.
  • To facilitate the discovery of selective PTP inhibitors.

Main Methods:

  • Synthesis and immobilization of a library of 144 putative peptide substrates onto a glass slide.
  • Screening the phosphopeptide microarray against various PTPs.

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Last Updated: Jun 10, 2026

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Published on: September 19, 2018

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  • Utilizing a signal-decrease assay for kinetic analysis.
  • Verification of results using traditional microplate-based enzymatic assays.

    • Main Results:

    • Generation of a phosphopeptide microarray enabling comparative substrate profiling for different PTPs.
    • Identification of several novel peptide substrates for PTPs.
    • Demonstration of the microarray as an efficient platform for high-throughput kinetic analysis of peptide/PTP interactions.

    Conclusions:

    • The developed phosphopeptide microarray is a powerful tool for PTP substrate discovery.
    • New PTP substrates identified can inform the development of specific PTP inhibitors.
    • This high-throughput approach offers a facile method for characterizing PTP activity and kinetics.