Immunogen sequence: SGPRGVQALL CACTSCLQAN YTCETDGACM VSIFNLDGME HHVRTCIPKV ELVPAGKPFY CLSSEDLRNT HCCYTDYCNR IDLRVPSGHL KEPEHPSMWG PVE; Positive Samples: SW480, Mouse kidney; Cellular Location: Cell membrane, Single-pass type I membrane protein
Activins are dimeric growth and differentiation factors which belong to the transforming growth factor-beta (TGF-beta) superfamily of structurally related signaling proteins. Activins signal through a heteromeric complex of receptor serine kinases which include at least two type I (I and IB) and two type II (II and IIB) receptors. These receptors are all transmembrane proteins, composed of a ligand-binding extracellular domain with a 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. This gene encodes activin A type IB receptor, composed of 11 exons. Alternative splicing and alternative polyadenylation result in 3 fully described transcript variants. The mRNA expression of variants 1, 2, and 3 is confirmed, and a potential fourth variant contains an alternative exon 8 and lacks exons 9 through 11, but its mRNA expression has not been confirmed.
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Protein Aliases: activin A receptor type IB; activin A receptor, type IB; activin A receptor, type II-like kinase 4; Activin receptor type IB; Activin receptor type-1B; Activin receptor-like kinase 4; ACTR-IB; ACTRI; ACVR1A; ACVRLK2; ALK-4; ALK2; FOP; Serine/threonine-protein kinase receptor R2; SKR2; TSRI
Gene Aliases: 6820432J04; ActR-IB; ACTRIB; ACVR1B; ACVRLK4; ALK4; SKR2
Molecular Function: serine/threonine protein kinase receptor