Characterization of EVL-I as a protein kinase D substrate

Cell Signal. 2009 Feb;21(2):282-92. doi: 10.1016/j.cellsig.2008.10.012. Epub 2008 Oct 29.

Abstract

EVL-I is a splice variant of EVL (Ena/VASP like protein), whose in vivo function and regulation are still poorly understood. We found that Protein Kinase D (PKD) interacts in vitro and in vivo with EVL-I and phosphorylates EVL-I in a 21 amino acid alternately-included insert in the EVH2 domain. Following knockdown of the capping protein CPbeta and spreading on laminin, phosphorylated EVL-I can support filopodia formation and the phosphorylated EVL-I is localized at filopodial tips. Furthermore, we found that the lamellipodial localization of EVL-I is unaffected by phosphorylation, but that impairment of EVL-I phosphorylation is associated with ruffling of lamellipodia upon PDBu stimulation. Besides the lamellipodial and filopodial localization of phosphorylated EVL-I in fibroblasts, we determined that EVL-I is hyperphosphorylated and localized in the cell-cell contacts of certain breast cancer cells and mouse embryo keratinocytes. Taken together, our results show that phosphorylated EVL-I is present in lamellipodia, filopodia and cell-cell contacts and suggest the existence of signaling pathways that may affect EVL-I via phosphorylation of its EVH2 domain.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alternative Splicing
  • Amino Acid Sequence
  • Animals
  • Cell Adhesion Molecules / metabolism*
  • Cell Line
  • Cells, Cultured
  • Cytoskeleton
  • Fibroblasts / metabolism
  • Humans
  • Immunoprecipitation
  • Mice
  • Phorbol Esters / pharmacology
  • Phosphorylation
  • Protein Kinase C / metabolism*
  • Pseudopodia / metabolism
  • Pseudopodia / ultrastructure

Substances

  • Cell Adhesion Molecules
  • Evl protein, mouse
  • Phorbol Esters
  • protein kinase D
  • Protein Kinase C