Multiple phosphorylation sites on the RegA phosphodiesterase regulate Dictyostelium development

Cell Signal. 2019 May:57:65-75. doi: 10.1016/j.cellsig.2019.02.005. Epub 2019 Feb 19.

Abstract

In Dictyostelium, the intracellular cAMP-specific phosphodiesterase RegA is a negative regulator of cAMP-dependent protein kinase (PKA), a key determinant in the timing of developmental morphogenesis and spore formation. To assess the role of protein kinases in the regulation of RegA function, this study identified phosphorylation sites on RegA and characterized the role of these modifications through the analysis of phospho-mimetic and phospho-ablative mutations. Mutations affecting residue T676 of RegA, a presumed target of the atypical MAP kinase Erk2, altered the rate of development and impacted cell distribution in chimeric organisms suggesting that phosphorylation of this residue reduces RegA function and regulates cell localization during multicellular development. Mutations affecting the residue S142 of RegA also impacted the rate developmental morphogenesis but in a manner opposite of changes at T676 suggesting the phosphorylation of the S142 residue increases RegA function. Mutations affecting residue S413 residue altered aggregate sizes and delayed developmental progression suggesting that PKA operates in a negative feedback mechanism to increase RegA function. These results suggest that the phosphorylation of different residues on RegA can lead to increased or decreased RegA function and therefore in turn regulate developmental processes such as aggregate formation, cell distribution, and the kinetics of developmental morphogenesis.

Keywords: Development; Dictyostelium; PKA; Phosphodiesterase; RegA; cAMP.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • 3',5'-Cyclic-AMP Phosphodiesterases / metabolism*
  • Animals
  • Bacterial Proteins / metabolism*
  • Cell Differentiation / physiology
  • Cyclic AMP / metabolism
  • Cyclic AMP-Dependent Protein Kinases / metabolism
  • Dictyostelium / genetics
  • Dictyostelium / metabolism*
  • Morphogenesis / physiology*
  • Mutation / genetics
  • Phosphoric Diester Hydrolases / metabolism
  • Phosphorylation / physiology
  • Protein Kinases / metabolism
  • Protozoan Proteins / metabolism

Substances

  • Bacterial Proteins
  • Protozoan Proteins
  • RegA protein, Bacteria
  • Cyclic AMP
  • Protein Kinases
  • Cyclic AMP-Dependent Protein Kinases
  • Phosphoric Diester Hydrolases
  • 3',5'-Cyclic-AMP Phosphodiesterases