Related Experiment Video
Updated: Mar 12, 2026
07:30
Homogeneous Time-resolved Förster Resonance Energy Transfer-based Assay for Detection of Insulin Secretion
Published on: May 10, 2018
9.8K
Temporal Analysis of PP2A Phosphatase Activity During Insulin Stimulation Using a Direct Activity Probe
Jon R Beck1, Tiffany Truong1, Cliff I Stains1
1Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States.
ACS Chemical Biology
|November 3, 2016
Summary
We developed a fluorescent probe to measure protein phosphatase 2A (PP2A) activity in cells. This tool reveals how PP2A rapidly responds to insulin stimulation in liver cells, offering new insights into cellular signaling.
Area of Science:
- Biochemistry
- Cell Biology
- Chemical Biology
Background:
- Protein serine/threonine phosphatases (PSPs) are crucial for cellular signaling.
- Protein phosphatase 2A (PP2A) is abundant and plays a significant role, but its activity dynamics during insulin stimulation are poorly understood.
Discussion:
- Developed a novel, direct fluorescent activity probe for quantifying global PP2A enzymatic activity in unfractionated cell lysates.
- Applied the probe to profile PP2A activity in liver hepatocytes following insulin stimulation.
- Observed a rapid and significant response of PP2A catalytic activity to extracellular insulin signaling.
Key Insights:
- Provides direct evidence for the rapid modulation of PP2A catalytic activity by extracellular stimuli.
- Illuminates the complex interplay between kinase and phosphatase activities in regulating cellular phosphorylation.
- Establishes a new chemical biology tool for studying PSPs.
Outlook:
- The developed fluorescent probe enables further investigation into the role of PSPs in various cellular processes.
- Facilitates deeper understanding of signaling pathways regulated by PP2A.
- Opens avenues for exploring PP2A dysregulation in disease states.
