Human TGF-beta  RI/ALK-5 Antibody

Recombinant Monoclonal Antibody
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Human TGF-beta  RI/ALK-5 Antibody Summary

Species Reactivity
Detects human TGF-beta RI/ALK-5 in direct ELISAs.
Recombinant Monoclonal Mouse IgG1 Clone # 854621R
Protein A or G purified from cell culture supernatant
Mouse myeloma cell line NS0-derived recombinant human TGF-beta RI/ALK-5
Accession # P36897
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


Recommended Concentration

This antibody functions as an ELISA capture antibody when paired with Goat Anti-Human TGF‑ beta  RI/ALK‑5 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF3025).

This product is intended for assay development on various assay platforms requiring antibody pairs.


Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Reconstitution Calculator

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Preparation and Storage

Reconstitute at 0.5 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: TGF-beta RI/ALK-5

TGF-beta RI, also called ALK-5, is an approximately 55 kDa type I transmembrane serine/threonine receptor kinase (1, 2). It contains a cysteine-rich extracellular domain (ECD), a transmembrane helix, and a C-terminal cytoplasmic kinase domain (3). Within the cytoplasmic domain there is also a short, conserved regulatory sequence known as the GS region that is N-terminal to the kinase domain (1). Within the ECD, human TGF-beta RI shares 90% and 88% aa sequence identity with mouse and rat TGF-beta RI, respectively. In the presence of TGF-beta, TGF-beta RI forms a complex with, and is phosphorylated by, TGF-beta RII (1). Phosphorylated TGF-beta RI can then transiently bind and phosphorylate Smad2 and Smad3 (2, 4-6). These phosphorylated Smads form heteromeric complexes with Smad4, translocate to the nucleus, and regulate target gene transcription (2, 4-6). TGF-beta RI is likely important during development, since mice deficient for TGF-beta RI die at midgestation with severe defects in vascular development of the yolk sac and placenta, and an absence of circulating red blood cells (7). Furthermore, TGF-beta RI appears to be involved in proper lymphatic network development (8). Mutations in TGF-beta RI have been identified in pancreatic, colorectal, ovarian, and head and neck cancers (9).

  1. Wrana, J.L. et al. (1994) Nature 370:341.
  2. Massagué, J. (2012) Nat. Rev. Mol. Cell Biol. 13:616.
  3. Huse, M. et al. (1999) Cell 96:425.
  4. Marcías-Silva, M. et al. (1996) Cell 87:1215.
  5. Zhang, Y. et al. (1996) Nature 383:168.
  6. Huse, M. et al. (2001) Mol. Cell 8:671.
  7. Larsson, J. et al. (2001) EMBO J. 20:1663.
  8. James, J.M. et al. (2013) Development 140:3903.
  9. Sheen, Y.Y. et al. (2013) Biomol. Ther. (Seoul) 21:323.
Long Name
Transforming Growth Factor beta Receptor I
Entrez Gene IDs
7046 (Human); 21812 (Mouse); 29591 (Rat)
Alternate Names
AAT5; activin A receptor type II-like kinase, 53kD; activin A receptor type II-like kinase, 53kDa; Activin receptor-like kinase 5; ACVRLK4; ALK-5; ALK-5ALK5; EC 2.7.11; EC; LDS1A; LDS2A; Serine/threonine-protein kinase receptor R4; SKR4; tbetaR-I; TGFB1R1; TGF-beta receptor type I; TGF-beta receptor type-1; TGF-beta RI; TGF-beta type I receptor; TGFbetaRI; TGFBR1; TGF-bRI; TGFR-1; transforming growth factor beta receptor I; transforming growth factor, beta receptor 1; transforming growth factor, beta receptor I (activin A receptor type II-likekinase, 53kD); Transforming growth factor-beta receptor type I

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Human TGF-beta  RI/ALK-5 Antibody
By Jenna Nguyen on 06/17/2019
Application: Affinity Purification Sample Tested: 3T3-L1 mouse embryonic fibroblast adipose-like cell line,4T1 mouse breast cancer cell line Species: Mouse