Temporal Analysis of PP2A Phosphatase Activity During Insulin Stimulation Using a Direct Activity Probe

Jon R. Beck, Tiffany Truong, Cliff I. Stains

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Protein serine/threonine phosphatases (PSPs) are ubiquitously expressed in mammalian cells. In particular, PP2A accounts for up to 1% of the total protein within cells. Despite clear evidence for the role of PP2A in cellular signaling, there is a lack of information concerning the magnitude and temporal dynamics of PP2A catalytic activity during insulin stimulation. Herein, we describe the development of a direct, fluorescent activity probe capable of reporting on global changes in PP2A enzymatic activity in unfractionated cell lysates. Utilizing this new probe, we profiled the magnitude as well as temporal dynamics of PP2A activity during insulin stimulation of liver hepatocytes. These results provide direct evidence for the rapid response of PP2A catalytic activity to extracellular stimulation, as well as insight into the complex regulation of phosphorylation levels by opposing kinase and phosphatase activities within the cell. This study provides a new tool for investigating the chemical biology of PSPs.

Original languageEnglish (US)
Pages (from-to)3284-3288
Number of pages5
JournalACS chemical biology
Volume11
Issue number12
DOIs
StatePublished - Dec 16 2016

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine

Fingerprint Dive into the research topics of 'Temporal Analysis of PP2A Phosphatase Activity During Insulin Stimulation Using a Direct Activity Probe'. Together they form a unique fingerprint.

  • Cite this