Growth signalling pathways in Arabidopsis and the AGC protein kinases

Trends Plant Sci. 2003 Sep;8(9):424-31. doi: 10.1016/S1360-1385(03)00188-2.


Lipid-derived signals are central to regulating a multitude of cellular processes but, in plants, little is known of the downstream signalling pathways. The Arabidopsis 3-phosphoinositide-dependent protein kinase (PDK1) could couple lipid signals to the activation of several protein kinases of the so-called AGC kinase family. The Arabidopsis AGC kinases contain sequence motives required for the docking of PDK1 and phosphorylation of their activation loop in the kinase catalytic domain. It is becoming evident that specific members of the AGC kinases are implicated in key growth signalling pathways. For example, Arabidopsis p70(S6K) might be a nodal point able to integrate hormonal and developmental signals with nutritional inputs, together with the Arabidopsis Target of Rapamycin (TOR) protein.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • 3-Phosphoinositide-Dependent Protein Kinases
  • Amino Acid Sequence
  • Arabidopsis / classification
  • Arabidopsis / enzymology
  • Arabidopsis / growth & development*
  • Binding Sites
  • Cyclic AMP-Dependent Protein Kinases / chemistry
  • Cyclic AMP-Dependent Protein Kinases / metabolism*
  • Peptide Fragments / chemistry
  • Phylogeny
  • Protein Kinases / chemistry
  • Protein Kinases / metabolism*
  • Protein-Serine-Threonine Kinases / metabolism*
  • Signal Transduction / physiology*


  • Peptide Fragments
  • Protein Kinases
  • 3-Phosphoinositide-Dependent Protein Kinases
  • Protein-Serine-Threonine Kinases
  • Cyclic AMP-Dependent Protein Kinases