Recombinant Human TrkA His Tagged Protein, CF Summary
Product Specifications
Ala34-Gly423, with a C-terminal 6-His tag
Analysis
Product Datasheets
9966-TK
Carrier Free
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
9966-TK
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS. |
| Reconstitution | Reconstitute at 1 mg/mL in PBS. |
| Shipping | The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. |
| Stability & Storage: |
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Scientific Data
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Recombinant Human TrkA inhibits Recombinant Human beta-NGF-induced proliferation of TF‑1 human erythroleukemic cells. The ED50 for this effect is 0.2-1.2 μg/mL.
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2 μg/lane of Recombinant Human TrkA was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® blue staining, showing bands at 86-100 kDa.
Background: TrkA
TrkA (Tyrosine kinase receptor A), also known as High affinity NGF receptor, is a member of the neurotrophic tyrosine kinase receptor family that has three members, TrkA, Trk B and Trk C, which preferentially bind NGF, NT-4 and BDNF, and NT-3, respectively (1). All Trk family proteins share a conserved complex subdomain organization consisting of a signal peptide, two cysteine-rich domains, a cluster of three leucine-rich motifs, and two immunoglobulin-like domains in the extracellular region, as well as an intracellular region that contains the tyrosine kinase domain. Two distinct TrkA isoforms that differ by virtue of a 6-amino acid insertion in their extracellular domain have been identified. The longer TrkA isoform is the only isoform expressed within neuronal tissues whereas the shorter TrkA is expressed mainly in non-neuronal tissues (1). NGF binds to TrkA with low affinity and activates its cytoplasmic kinase, initiating a signaling cascade that mediates neuronal survival and differentiation. Higher affinity binding of NGF requires the coexpression of TrkA with the p75 NGF receptor (NGFR), a member of the tumor necrosis factor receptor superfamily (2). NGFR binds all neurotrophins with low affinity and modulates Trk activity as well as alters the specificity of Trk receptors for their ligands. NGFR can also mediate cell death when being expressed independent of Trk (3).
- Shelton D.L. et al. (1995) J. Neurosci. 15:477.
- Esposito, D. et al. (2001) J. Biol. Chem. 276:32687.
- Sofroniew, M.V. et al. (2001) Annu. Rev. Neurosci. 24:1217.
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