Recombinant Human PTK7/CCK4 Fc Chimera Protein, CF

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Recombinant Human PTK7/CCK4 Fc Chimera Protein Binding Activity
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Product Details
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Recombinant Human PTK7/CCK4 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 binding ability in a functional ELISA. In a 100 µL reaction mixture containing biotinylated Recombinant Mouse Wnt-3a (Catalog # BT1324) at 50 ng/mL and Recombinant Human PTK7/CCK4 Chimera dilutions, the concentration of Recombinant Human PTK7/CCK4 Fc Chimera that produces 50% of the maximal binding response is 4-20 μg/mL.
Human embryonic kidney cell, HEK293-derived human PTK7/CCK4 protein
Human PTK7/CCK4
Accession # Q13308-1
Accession #
N-terminal Sequence
Structure / Form
Disulfide-linked homodimer
Predicted Molecular Mass
101 kDa
111-129 kDa, reducing conditions

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 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.

Scientific Data

Binding Activity Recombinant Human PTK7/CCK4 Fc Chimera Protein Binding Activity View Larger

Recombinant Human PTK7/CCK4 Fc Chimera (Catalog # 9799-TK) binds to Recombinant Biotinylated Mouse Wnt-3a (Catalog # BT1324) with an ED50 of 4-20 µg/mL.

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: PTK7/CCK4

Protein tyrosine kinase 7 (PTK7), also known as colon carcinoma kinase 4 (CCK4), is a member of the receptor tyrosine kinase superfamily (1, 2). Human PTK7 is a 1040 amino acid (aa) glycoprotein containing a 674 aa extracellular domain (ECD), a 21 aa transmembrane domain, and a 345 aa cytoplasmic tyrosine kinase homology domain. Due to the lack of the residues required for catalytic activity in the kinase domain, PTK7 is considered a pseudokinase (1, 3). The mature ECD of PTK7 contains 7 Ig-like C2 type loops and shares 92% and 91% aa identity with mouse and rat PTK7 ECD, respectively (1-4). PTK7 is expressed in a wide array of tissue types ranging from lung and liver to kidney and placenta, and has been linked to a broad range of functions (5). While originally identified as being over-expressed in colon carcinomas, PTK7 has been shown to play a role in embryogenesis, epithelial tissue organization, angiogenesis, cell motility, and survival (1, 6, 7). PTK7 has been shown to be an important regulator of the Wnt signaling pathways, both canonical and non-canonical, and is linked to the regulation of the planar cell polarity pathway (3, 6). Soluble forms of PTK7 are known to be shed from the cell surface by matrix metalloproteinases (MMPs), a disintegrin domain and metalloproteinases (ADAMs), and gamma -secretase (3, 6). The soluble form is a co-receptor for the Semaphorin/Plexin and VEGF signaling pathways (8). Deregulation of PTK7 signaling has now been observed in numerous cancers including colon, gastric, lung, and acute myeloid leukemia (1, 3). Recent studies have shown that PTK7 expression promoted increased migration and resistance to apoptosis in leukemic cells and acute myeloid leukemia (AML) blasts, while knock-down of PTK7 induced apoptosis in colorectal carcinoma cells (2, 7). Further, other studies have suggested that the ratio of full-length vs. cleaved protein, not just expression, contributes to PTK7's metastatic effects in cancer (6).

  1. Shin, W. et al. (2008) Biochem. Bioph. Res. Co. 371:793.
  2. Meng, L. et al. (2010) PLoS ONE 5:e14018.
  3. Golubkov, V. et al. (2010) J. Biol. Chem. 285:35740.
  4. Berger, H. et al. (2017) Front. Cell Dev. Biol. 5:doi:10.3389/fcell.2017.00031.
  5. Park, S. et al. (1996) J. Biochem. 119:235.
  6. Golubkov, V. et al. (2014) J. Biol. Chem. 289:24238.
  7. Prebet, T. et al. (2010) Blood. 116:2315.
  8. Peradziryi, H. et al. (2012) Arch. Biochem. Biophys. 524:71.
Long Name
Protein Tyrosine Kinase 7
Entrez Gene IDs
5754 (Human); 71461 (Mouse); 301242 (Rat)
Alternate Names
CCK4; CCK-4; CCK4Colon carcinoma kinase 4; colon carcinoma kinase-4; Protein-tyrosine kinase 7; Pseudo tyrosine kinase receptor 7; PTK7 protein tyrosine kinase 7; PTK7; Tyrosine-protein kinase-like 7

Citation for Recombinant Human PTK7/CCK4 Fc Chimera Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

1 Citation: Showing 1 - 1

  1. Senescent cells perturb intestinal stem cell differentiation through Ptk7 induced noncanonical Wnt and YAP signaling
    Authors: J Yun, S Hansen, O Morris, DT Madden, CP Libeu, AJ Kumar, C Wehrfritz, AH Nile, Y Zhang, L Zhou, Y Liang, Z Modrusan, MB Chen, CC Overall, D Garfield, J Campisi, B Schilling, RN Hannoush, H Jasper
    Nature Communications, 2023-01-11;14(1):156.
    Species: Human
    Sample Types: Protein
    Applications: ELISA Capture


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