Serine/threonine protein kinase which forms a receptor complex on ligand binding. The receptor complex consisting of 2 type II and 2 type I transmembrane serine/threonine kinases. Type II receptors phosphorylate and activate type I receptors which autophosphorylate, then bind and activate SMAD transcriptional regulators, SMAD2 and SMAD3. Receptor for activin AB, activin B and NODAL. Plays a role in cell differentiation, growth arrest and apoptosis.
Bondestam J., Cytogenet. Cell Genet. 95:157-162(2001).
Roberts H.J., Biol. Reprod. 68:1719-1726(2003).
Hillier L.W., Nature 434:724-731(2005).