Recombinant Mouse EphA3 Fc Chimera Protein, CF

R&D Systems, part of Bio-Techne | Catalog # 640-A3

R&D Systems, part of Bio-Techne
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640-A3-200
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Key Product Details

Source

NS0

Accession #

Q8BRB1

Structure / Form

Disulfide-linked homodimer

Conjugate

Unconjugated

Applications

Binding Activity

View all EphA3 Proteins and Enzymes »

Product Specifications

Source

Mouse myeloma cell line, NS0-derived mouse EphA3 protein
Mouse EphA3
Glu21 - His541 (Thr323Ala & Glu476Gln)
Accession # Q8BRB1		 IEGRMD Human IgG1
(Pro100 - Lys330)		 6-His tag
N-terminus C-terminus

Purity

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

Endotoxin Level

<1.0 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Glu21

Predicted Molecular Mass

86 kDa (monomer)

SDS-PAGE

110 kDa, reducing conditions

Activity

Measured by its binding ability in a functional ELISA.
Immobilized rmEphA3/Fc Chimera at 2 µg/mL (100 µL/well) can bind rhEphrin A5 Fc Chimera with a linear range of 0.08-5 ng/mL. Optimal dilutions should be determined by each laboratory for each application.

Formulation, Preparation and Storage

640-A3
Formulation Lyophilized from a 0.2 μm filtered solution in Tris.
Reconstitution
Reconstitute at 100 μg/mL in sterile PBS.

Reconstitution Buffer Available:
Size / Price
Qty
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: EphA3

EphA3, also known as Cek4, Mek4, Hek, Tyro4, and Hek4, is a 135 kDa glycosylated member of the transmembrane Eph receptor tyrosine kinase family. The A and B classes of Eph proteins are distinguished by Ephrin ligand binding preference but have a common structural organization. EphA3 preferentially binds to Ephrin-A5. Eph-Ephrin interactions are widely involved in the regulation of cell migration, tissue morphogenesis, and cancer progression (1, 2). The 520 amino acid (aa) extracellular domain (ECD) of mouse EphA3 contains an N-terminal Ephrin binding region, a cysteine-rich region, and two fibronectin type II domains. The 419 aa cytoplasmic domain contains the tyrosine kinase domain and a sterile alpha motif (SAM) (3, 4). Within the ECD, mouse EphA3 shares 96% and 98% aa sequence identity with human and rat EphA3, respectively. Alternate splicing generates a secreted isoform that consists of nearly the entire ECD. EphA3 is expressed in the developing forebrain, retinal axons, some spinal cord motor neurons, and the heart where it plays an important role in axonal repulsion and organ morphogenesis (5 ‑ 8). It is upregulated on some hematopoietic and solid tumor cells and on astrocytes surrounding injured nervous tissue (5, 9 - 11). EphA3 ligation inhibits cellular adhesion to fibronectin as well as cellular migration (9, 10). Transmembrane EphA3 associates in cis with ADAM10 which then promotes the cleavage in trans of Ephrin-A5 (12). It also associates in cis with Ephrin-A5 on retinal axons, thereby preventing the activation of EphA3 by Ephrin-A (13). Multiple tyrosine residues within the cytoplasmic region of EphA3 become phosphorylated during ligand-induced signaling (14, 15).

References

  1. Pasquale, E.B. (2005) Nat. Rev. Mol. Cell Biol. 6:462.
  2. Merlos-Suarez, A. and E. Batlle (2008) Curr. Opin. Cell Biol. 20:194.
  3. Sajjadi, F.G. et al. (1991) New Biol. 3:769.
  4. Lackmann, M. et al. (1998) J. Biol. Chem. 273:20228.
  5. Chiari, R. et al. (2000) Cancer Res. 60:4855.
  6. Kudo, C. et al. (2005) J. Comp. Neurol. 487:255.
  7. Kilpatrick, T.J. et al. (1996) Mol. Cell. Neurosci. 7:62.
  8. Stephen, L.J. et al. (2007) Dev. Biol. 302:66.
  9. Smith, L.M. et al. (2004) Exp. Cell Res. 292:295.
  10. Clifford, N. et al. (2008) J. Cell. Biochem. 105:1250.
  11. Irizarry-Ramirez, M. et al. (2005) J. Neurotrauma 22:929.
  12. Janes, P.W. et al. (2005) Cell 123:291.
  13. Carvalho, R.F. et al. (2006) Nat. Neurosci. 9:322.
  14. Shi, G. et al. (2010) Cell Res. June epub.
  15. Hu, T. et al. (2009) Biochemistry 48:6369.

Long Name

Eph Receptor A3

Alternate Names

Cek4, Hek4, Tyro4

Entrez Gene IDs

2042 (Human); 13837 (Mouse)

Gene Symbol

EPHA3

UniProt

Q8BRB1

Additional EphA3 Products

Product Documents for Recombinant Mouse EphA3 Fc Chimera Protein, CF

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