The immunogen is a synthetic peptide directed towards the middle region of human ACVR2B
Alternative Synonym:
HTX4, ACTRIIB, ActR-IIB
Activin receptors are all transmembrane proteins, composed of a ligand-binding extracellular domain with cysteine-rich region, a transmembrane domain, and a cytoplasmic domain with predicted serine/threonine specificity. Type I receptors are essential for signaling, and type II receptors are required for binding ligands and for expression of type I receptors. Type I and II receptors form a stable complex after ligand binding, resulting in phosphorylation of type I receptors by type II receptors. Type II receptors are considered to be constitutively active kinases. ACVR2B is activin A type IIB receptor, which displays a 3- to 4-fold higher affinity for the ligand than activin A type II receptor.