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Recombinant Human Axl Fc Chimera Protein, CF

Catalog # 154-AL | R&D Systems, Inc. a Bio-Techne Brand
Catalog #
Size / Price

Key Product Details

Accession #



Structure / Form

Disulfide-linked homodimer




Binding Activity

Product Specifications


Mouse myeloma cell line, NS0-derived human Axl protein
Human Axl
Accession # AAA61243
6-His tag
N-terminus C-terminus


>90%, by SDS-PAGE under reducing conditions and visualized by silver stain.

Endotoxin Level

<0.1 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis


Predicted Molecular Mass

71.7 kDa (monomer)


100-110 kDa, reducing conditions


Measured by its binding ability in a functional ELISA.
When Recombinant Human Axl Fc Chimera is immobilized at 2 µg/mL (100 µL/well), the concentration of Recombinant Human Gas6 (Catalog # 885-GS) that produces 50% of the optimal binding response is approximately 2.5‑15 ng/mL.

Formulation, Preparation and Storage

Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitute at 100 μg/mL in sterile PBS.

Reconstitution Buffer Available:
Size / Price
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
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.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Axl

Axl, also known as Ufo and Ark, is a widely expressed 140 kDa glycoprotein in the TAM receptor tyrosine kinase family. TAM family receptors (Dtk/Tyro3, Axl, and Mer) are involved in regulation of the inflammatory response, cell survival and migration, and tumorigenesis (1). Mature human Axl consists of a 426 aa extracellular domain (ECD) that contains two Ig-like domains and two fibronectin type III domains, a 21 aa transmembrane segment, and a 422 aa cytoplasmic domain that includes the tyrosine kinase domain (2). Within the ECD, human Axl shares approximately 82% aa sequence identity with mouse and rat Axl. A short alternately spliced form of human Axl has a 9 aa deletion in the extracellular juxtamembrane region (2). Axl binds the vitamin K-dependent protein Gas6 which triggers tyrosine autophosphorylation of the Axl cytoplasmic domain (3). Activation of Axl induces a broad range of activities including platelet aggregation and thrombus formation (4), macrophage and dendritic cell phagocytosis of apoptotic cells (5), NK cell development from hematopoietic progenitor cells (6), and in vivo angiogenesis (7). Axl is highly expressed in solid cancers and promotes in vivo tumorigenesis and tumor cell invasiveness (7, 8). It contributes to vascular remodeling and inflammatory cell infiltration in response to hypertension and restricted blood flow (9). It also functions as a cellular entry receptor for Gas6-opsonized lentiviruses (10). A 70-80 kDa soluble portion of the Axl ECD can be shed by proteolytic cleavage, and this fragment retains the ability to bind Gas6 (11, 12).


  1. Linger, R.M.A. et al. (2011) Adv. Cancer Res. 100:35.
  2. O’Bryan, J.P. et al. (1991) Mol. Cell. Biol. 11:5016.
  3. Nagata, K. et al. (1996) J. Biol. Chem. 22:30022.
  4. Cosemans, J.M.E.M. et al. (2010) J. Thromb. Haemost. 8:1797.
  5. Seitz, H.M. et al. (2007) J. Immunol. 178:5635.
  6. Park, I.-K. et al. (2009) Blood 113:2470.
  7. Holland, S. et al. (2005) Cancer Res. 65:9294.
  8. Rankin, E.B. et al. (2010) Cancer Res. 70:7570.
  9. Korshunov, V.A. et al. (2006) Circ. Res. 98:1446.
  10. Morizono, K. et al. (2011) Cell Host Microbe 9:286.
  11. O’Bryan, J.P. et al. (1995) J. Biol. Chem. 270:551.
  12. Ekman, C. et al. (2010) J. Thromb. Haemost. 8:838.

Long Name

Axl Receptor Tyrosine Kinase

Alternate Names

AI323647, ARK, JTK11, Tyro7, UFO

Entrez Gene IDs

558 (Human); 26362 (Mouse); 102126361 (Cynomolgus Monkey)

Gene Symbol



Product Documents for Recombinant Human Axl Fc Chimera Protein, CF

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant Human Axl Fc Chimera Protein, CF

For research use only

Citations for Recombinant Human Axl Fc Chimera Protein, CF (12)

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