Epidermal growth factor induces serine phosphorylation of actin

Abstract
Stimulation of cells by epidermal growth factor induces a rapid polymerisation of actin in the cortical skeleton. Activation of the EGF‐receptor leads to autophosphorylation and to phosphorylation of specific intracellular substrates. Here we show that actin is phosphorylated in vitro and in vivo upon EGF stimulation. Two‐dimensional phospho‐amino acid analysis shows that phosphorylation occurs on serine, not on tyrosine residues.