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Related Experiment Videos

The RdeA-RegA system, a eukaryotic phospho-relay controlling cAMP breakdown.

P A Thomason1, D Traynor, J B Stock

  • 1Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, United Kingdom. thomason@mrc-lmb.cam.ac.uk

The Journal of Biological Chemistry
|September 17, 1999
PubMed
Summary

Dictyostelium development relies on cAMP signaling regulated by RegA and RdeA proteins. Genetic and biochemical evidence shows RdeA transfers phosphates to RegA, activating its phosphodiesterase activity for proper development.

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Area of Science:

  • Cellular signaling pathways
  • Molecular mechanisms of development
  • Eukaryotic signal transduction

Background:

  • The regA and rdeA genes in Dictyostelium encode proteins crucial for regulating cyclic AMP (cAMP) signaling.
  • RegA is a response regulator with a receiver domain and a cAMP-phosphodiesterase domain.
  • RdeA is hypothesized to be a phospho-transfer protein supplying phosphates to RegA.

Purpose of the Study:

  • To investigate the functional relationship between RegA and RdeA in Dictyostelium.
  • To determine the role of protein phosphorylation in RegA activity.
  • To elucidate the mechanism of phospho-transfer between RdeA and RegA.

Main Methods:

  • Genetic analysis in Dictyostelium.
  • Biochemical assays for protein-protein interaction and phospho-transfer.

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  • Site-directed mutagenesis to identify key amino acid residues.

    • Main Results:

    • Phosphorylated RegA (phospho-RegA) is the active form of the enzyme in vivo, with aspartate phosphorylation at position 212 being critical.
    • RdeA and RegA directly interact and transfer phosphates in vitro, dependent on histidine 65 of RdeA and aspartate 212 of RegA.
    • Phosphorylation by RdeA or a heterologous donor significantly enhances RegA's phosphodiesterase activity (at least 20-fold).

    Conclusions:

    • RegA and RdeA form a eukaryotic His-Asp phospho-relay system regulating Dictyostelium development.
    • This signaling network is essential for Dictyostelium development and fruiting body maturation.
    • The findings reveal a novel mechanism for signal transduction in eukaryotes.