Activin A receptor, type IIB, also known as ACVR2B, is a human gene. ACVR2B is an activin type 2 receptor. 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 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. This gene encodes activin A type IIB receptor, which displays a 3- to 4-fold higher affinity for the ligand than activin A type II receptor. Activin type II receptors are highly conserved. Human, mouse and rat type II activin receptors share greater than 98% amino acid sequence homology. Recombinant soluble activin type II receptors bind activin with high affinity, and are potent activin antagonists.
>95% by SDS-PAGE and analyzed by silver stain.
<0.1 EU/µg as determined by the LAL method
Fusion Protein Tag
Fc Fusion Protein
Sf 21 Insect Cells
Protein Accession No.
Amino Acid Sequence
sg rgeaetreci yynanweler tnqsglerce geqdkrlhcy aswanssgti elvkkgcwld dfncydrqec vateenpqvy fcccegnfcn erfthlpeag gpevtyeppp taptiegrmd pkscdkthtc ppcpapellg gpsvflfppk pkdtlmisrt pevtcvvvdv shedpevkfn wyvdgvevhn aktkpreeqy nstyrvvsvl tvlhqdwlng keykckvsnk alpapiekti skakgqprep qvytlppsrd eltknqvslt clvkgfypsd iavewesngq pennykttpp vldsdgsffl yskltvdksr whhhhhh qqgnvfscsv mhealhnhyt qkslslspgk
N-terminal Sequence Analysis
State of Matter
Predicted Molecular Mass
The predicted molecular weight of Recombinant Human Act R-IIB is Mr 41 kDa. However, the actual molecular weight as observed by migration on SDS-PAGE is Mr 55-60 kDa.
This recombinant protein was 0.2 µm filtered and lyophilized from modified Dulbecco’s phosphate buffered saline (1X PBS) pH 7.2 – 7.3 with no calcium, magnesium, or preservatives.
Storage and Stability
This lyophilized protein is stable for six to twelve months when stored desiccated at -20°C to -70°C. After aseptic reconstitution, this protein may be stored at 2°C to 8°C for one month or at -20°C to -70°C in a manual defrost freezer. Avoid Repeated Freeze Thaw Cycles. See Product Insert for exact lot specific storage instructions.
Country of Origin
Next Day Ambient
NCBI Gene Bank
References & Citations
1. Voutilainen, R. et al. (2002) J Clin Endocrinol Metab. 87(9):4257-63.
IMPORTANT Use lot specific datasheet for all technical information pertaining to this recombinant protein.
Products are for research use only. Not for use in diagnostic or therapeutic procedures.