Upon binding Activin A (INHBA:INHBA), Activin AB (INHBA:INHBB), or Activin B (INHBB:INHBB), the type II component of the activin receptor (ACVR2A or ACVR2B) phosphorylates the type I component ACVR1B (ALK4) at multiple serine and threonine residues within the GS domain (Attisano et al. 1996, Willis et al. 1996, Willis and Mathews 1997, Zhou et al. 2000).
Donaldson, C, Gray, PC, Vale, W, Choe, S, Fischer, WH, Harrison, CA
Willis, SA, Mathews, LS
Zhang, X, Klibanski, A, Zhou, Y, Sigai, DP, Danila, DC, Sun, H, Johnson, SR
Willis, SA, Mathews, LS, Zimmerman, CM, Li, LI
Massague, J, Wrana, JL, Attisano, L, Montalvo, E
protein serine/threonine kinase activity of Activin A,AB,B:ACVR2A,B:ACVR1B [plasma membrane]
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