Design and synthesis of fluorescent activity probes for protein phosphatases

Garrett R. Casey, Jon R. Beck, Cliff I. Stains

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Scopus citations


Protein phosphatases act in concert with protein kinases to regulate and maintain the phosphoproteome. However, the catalog of chemical tools to directly monitor the enzymatic activity of phosphatases has lagged behind their kinase counterparts. In this chapter, we provide protocols for repurposing the phosphorylation-sensitive sulfonamido-oxine fluorophore known as Sox to afford direct activity probes for phosphatases. With validated activity probes in-hand, inhibitor screens can be conducted with recombinant enzyme and the role of phosphatases in cell signaling can be investigated in unfractionated cell lysates.

Original languageEnglish (US)
Title of host publicationChemical and Synthetic Biology Approaches To Understand Cellular Functions - Part B
EditorsArun K. Shukla
PublisherAcademic Press Inc.
Number of pages25
ISBN (Print)9780128181195
StatePublished - 2019

Publication series

NameMethods in Enzymology
ISSN (Print)0076-6879
ISSN (Electronic)1557-7988


  • Biosensor
  • Cell signaling
  • Fluorescent probes
  • Phosphatase
  • Sensor

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology


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