Issue 10, 2015

Charting the interactome of PDE3A in human cells using an IBMX based chemical proteomics approach

Abstract

In the cell the second messenger cyclic nucleotides cAMP and cGMP mediate a wide variety of external signals. Both signaling molecules are degraded by the superfamily of phosphodiesterases (PDEs) consisting of more than 50 different isoforms. Several of these PDEs are implicated in disease processes inspiring the quest for and synthesis of selective PDE inhibitors, that unfortunately have led to very mixed successes in clinical trials. This may be partially caused by their pharmacological action. Accumulating data suggests that small differences between different PDE isoforms may already result in specific tissue distributions, cellular localization and different involvement in higher order signal protein complexes. The role of PDEs in these higher order signal protein complexes has only been marginally addressed, as no screening methodology is available to address this in a more comprehensive way. Affinity based chemical proteomics is a relatively new tool to identify specific protein–protein interactions. Here, to study the interactome of PDEs, we synthesized a broad spectrum PDE-capturing resin based on the non-selective PDE inhibitor 3-isobutyl-1-methylxanthine (IBMX). Chemical proteomics characterization of this resin in HeLa cell lysates led to the capture of several different PDEs. Combining the IBMX-resin with in-solution competition with the available more selective PDE inhibitors, cilostamide and papaverine, allowed us to selectively probe the interactome of PDE3A in HeLa cells. Besides known interactors such as the family of 14-3-3 proteins, PDE3A was found to associate with a PP2A complex composed of a regulatory, scaffold and catalytic subunit.

Graphical abstract: Charting the interactome of PDE3A in human cells using an IBMX based chemical proteomics approach

Supplementary files

Article information

Article type
Paper
Submitted
19 févr. 2015
Accepted
16 juil. 2015
First published
17 juil. 2015

Mol. BioSyst., 2015,11, 2786-2797

Charting the interactome of PDE3A in human cells using an IBMX based chemical proteomics approach

E. Corradini, G. Klaasse, U. Leurs, A. J. R. Heck, N. I. Martin and A. Scholten, Mol. BioSyst., 2015, 11, 2786 DOI: 10.1039/C5MB00142K

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