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Related Experiment Video

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Mapping the Cellular Distribution of an Optogenetic Protein Using a Light-Stimulation Grid

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Published on: January 26, 2024

Direct spatial control of Epac1 by cyclic AMP.

Bas Ponsioen¹, Martijn Gloerich, Laila Ritsma

¹Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066CX, Amsterdam, The Netherlands.

Molecular and Cellular Biology

|March 11, 2009

Summary

Cyclic AMP (cAMP) activates Epac1, a protein that regulates cell adhesion. cAMP also causes Epac1 to move to the cell membrane, enhancing its function in cell adhesion signaling.

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Area of Science:

Cell Biology
Molecular Signaling

Background:

Epac1 acts as a guanine nucleotide exchange factor (GEF) for the small G protein Rap.
Epac1 is activated by cyclic AMP (cAMP), leading to Rap activation and downstream effects like cell adhesion.

Purpose of the Study:

To investigate the effect of cAMP on Epac1 localization.
To determine the role of Epac1 translocation in Rap-mediated signaling and cell adhesion.

Main Methods:

Confocal fluorescence microscopy
Total internal reflection fluorescence (TIRF) microscopy
Fluorescent resonance energy transfer (FRET) assays

Main Results:

cAMP binding induces a rapid and reversible translocation of Epac1 to the plasma membrane.
Epac1 redistribution requires both the cAMP-induced conformational change and the DEP domain.
Epac1 activation at the plasma membrane enhances Rap activation and Rap-mediated cell adhesion.

Conclusions:

cAMP-mediated regulation of Epac1-Rap signaling involves both release from autoinhibition and plasma membrane recruitment.
Epac1 translocation to the plasma membrane is a key mechanism for enhancing Rap-mediated cell adhesion.