Recombinant Mouse TrkA Fc Chimera Protein, CF

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Recombinant Mouse TrkA Fc Chimera Protein Bioactivity
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Product Details

Recombinant Mouse TrkA Fc Chimera Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its ability to inhibit NGF-induced proliferation of TF‑1 human erythroleukemic cells. The ED50 for this effect is 4-24 ng/mL in the presence of 2 ng/mL of Recombinant Mouse beta ‑NGF (Catalog # 1156-NG).
Mouse myeloma cell line, NS0-derived mouse TrkA protein
Mouse TrkA
(Ala34 - Pro418)
Accession # Q3UFB7
(Glu98 - Lys330)
Accession #
N-terminal Sequence
Structure / Form
Disulfide-linked homodimer
Predicted Molecular Mass
69 kDa
100 - 125 kDa

Product Datasheets

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Carrier Free

What does CF mean?

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.

What formulation is right for me?

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.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped with polar packs. 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.

Scientific Data

Bioactivity Recombinant Mouse TrkA Fc Chimera Protein Bioactivity View Larger

Recombinant Mouse TrkA Fc Chimera (Catalog # 10235-TK) inhibits NGF-induced proliferation of TF-1 human erythroleukemic cells. The ED50 for this effect is 4-24 ng/mL in the presence of 2 ng/mL of Recombinant Mouse beta -NGF (Catalog # 1156-NG).

SDS-PAGE Recombinant Mouse TrkA Fc Chimera Protein SDS-PAGE View Larger

2 μg/lane of Recombinant Mouse TrkA Fc Chimera (Catalog # 10235-TK) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 100-125 kDa and 200-250 kDa, respectively.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: TrkA

Tropomyocin receptor kinase A (TrkA), also named Neurotrophic tyrosine kinase receptor type 1 (NTRK3) is a member of a nerve growth factor tyrosine kinase receptor family. There are three members of the Trk family, TrkA, TrkB and TrkC, and they bind a group of structurally related, secreted proteins termed neurotrophins, which play an important role in the development and function of the nervous system. The Trk family shares a conserved structural motif consisting of two cysteine-rich domains, a cluster of three leucine-rich motifs, and two immunoglobulin-like domains in the extracellular region, a single transmembrane domain and an intracellular tyrosine kinase domain (3). Natural splice variants of the different Trks, lacking the first cysteine-rich domain, the first and second or all three of the leucine-rich motifs, or the tyrosine kinase domain, have been described (4). Mature mouse TrkA consists of a 383 amino acid (aa) extracellular domain (ECD) which shares 79% and 93% aa identity with human and rat TrkA, respectively. Each Trk family member exhibits different ligand specificities: TrkA binds NGF and NT-3, TrkB binds BDNF, NT-3 and NT-4/5, and TrkC only binds NT-3 (1, 2). The biological activities of the neurotrophins are mediated by binding to and activating two unrelated receptor types: the p75 neurotrophin receptor (p75NTR) and the Trk family receptors (1, 2). P75NTR is a member of the tumor necrosis factor receptor superfamily (TNFRSF) and has been designated TNFRSF16. It binds all neurotrophins with low-affinity to transduce cellular signaling pathways that synergize or antagonize those activated by the Trk receptors. Several TrkA isoforms exist, two of which differ only by a 6-amino acid insertion in their extracellular domain (3). The longer TrkA isoform is the only isoform expressed within neuronal tissues whereas the shorter TrkA is expressed mainly in non-neuronal tissues (3). Trk receptor interactions with NGF play major roles in the development of the sympathetic nervous system, and TrkA, specifically, is essential to the survival of sympathetic neurons in vivo (4). NGF activates retrograde transport of TrkA endosomes for association with actin-modulatory proteins to promote F-actin disassembly, enabling their maturation into transport-competent signaling endosomes (1). Inhibition of the Trk receptors may have several therapeutic implications (5). Injection of a TrkA inhibitor in patients with knee osteoarthritis resulted in sustained pain improvement in a single center trial (6). Another inhibitor showed a significant reduction in psoriatic pruritus, which occurs via a Trka-dependent mechanism (7).

  1. Harrington, A. et al. (2011) Cell. 146(3):421.
  2. Smeyne, R. et al. (1994) 368(6468):246.
  3. Barker, P. et al. (1992) 268(20):15150.
  4. Fagan, A. et al. (1996) J Neurosci. 16(19):6208.
  5. Yan, W. et al. (2019) J Med. Chem. 62(4):1731.
  6. Krupka, E. et al. (2019) Osteoarthr Cartil. DOI: 10:1016.
  7. Yosipovitch, R. et al. (2015) Acta Derm Venereol. 95.
Long Name
Neurotrophic Tyrosine Kinase Receptor A
Entrez Gene IDs
4914 (Human); 18211 (Mouse); 59109 (Rat)
Alternate Names
DKFZp781I14186; EC 2.7.10; EC; MTChigh affinity nerve growth factor receptor; Neurotrophic tyrosine kinase receptor type 1; neurotrophic tyrosine kinase, receptor, type 1; NTRK1; NTRK-1; p140-TrkA; TRK1-transforming tyrosine kinase protein; TrkA; Trk-A; TRKAOncogene TRK; TRKTRK1; tyrosine kinase receptor A


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