Protein interactome of 3′,5′-cAMP reveals its role in regulating the actin cytoskeleton

Nicolás E. Figueroa, Peter Franz, Marcin Luzarowski, Federico Martinez-Seidel, Juan C. Moreno, Dorothee Childs, Aleksandra Ziemblicka, Arun Sampathkumar, Tonni Grube Andersen, Georgios Tsiavaliaris, Monika Chodasiewicz*, Aleksandra Skirycz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Identification of protein interactors is ideally suited for the functional characterization of small molecules. 3′,5′-cAMP is an evolutionary ancient signaling metabolite largely uncharacterized in plants. To tap into the physiological roles of 3′,5′-cAMP, we used a chemo-proteomics approach, thermal proteome profiling (TPP), for the unbiased identification of 3′,5′-cAMP protein targets. TPP measures shifts in the protein thermal stability upon ligand binding. Comprehensive proteomics analysis yielded a list of 51 proteins significantly altered in their thermal stability upon incubation with 3′,5′-cAMP. The list contained metabolic enzymes, ribosomal subunits, translation initiation factors, and proteins associated with the regulation of plant growth such as CELL DIVISION CYCLE 48. To functionally validate obtained results, we focused on the role of 3′,5′-cAMP in regulating the actin cytoskeleton suggested by the presence of actin among the 51 identified proteins. 3′,5′-cAMP supplementation affected actin organization by inducing actin-bundling. Consistent with these results, the increase in 3′,5′-cAMP levels, obtained either by feeding or by chemical modulation of 3′,5′-cAMP metabolism, was sufficient to partially rescue the short hypocotyl phenotype of the actin2 actin7 mutant, severely compromised in actin level. The observed rescue was specific to 3′,5′-cAMP, as demonstrated using a positional isomer 2′,3′-cAMP, and true for the nanomolar 3′,5′-cAMP concentrations reported for plant cells. In vitro characterization of the 3′,5′-cAMP–actin pairing argues against a direct interaction between actin and 3′,5′-cAMP. Alternative mechanisms by which 3′,5′-cAMP would affect actin dynamics, such as by interfering with calcium signaling, are discussed. In summary, our work provides a specific resource, 3′,5′-cAMP interactome, as well as functional insight into 3′,5′-cAMP-mediated regulation in plants.

Original languageEnglish (US)
Pages (from-to)1214-1230
Number of pages17
JournalPlant Journal
Issue number5
StatePublished - Sep 2023


  • 3′,5′-cAMP
  • actin
  • calcium signaling
  • cytoskeleton
  • ribosome
  • thermal proteome profiling

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology


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