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Recombinant Human CD9-LEL Fc Chimera Protein, CF

Bio-Techne includes R&D Systems | Catalog # 10015-CD

Catalog #
Size / Price

Key Product Details



Accession #

Structure / Form

Disulfide-linked homodimer





Product Specifications


Chinese Hamster Ovary cell line, CHO-derived human CD9 protein
Human IgG1
MD + (Pro100-Lys330)
Accession # P21926
N-terminus C-terminus


>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.

N-terminal Sequence Analysis

MD + Pro100

Predicted Molecular Mass

36.3 kDa


38-42 kDa, reducing conditions


Measured by its binding ability in a functional ELISA.
When Recombinant Human CD9 Fc Chimera is immobilized at 1 µg/mL (100 µL/well), Biotinylated Recombinant Human CD81 Fc Chimera binds with an ED50 of 2-10 μg/mL.

Scientific Data Images for Recombinant Human CD9-LEL Fc Chimera Protein, CF

Recombinant Human CD9-LEL Fc Chimera Protein Binding Activity

Recombinant Human CD9-LEL Fc Chimera Protein Binding Activity

When Recombinant Human CD9 Fc Chimera (Catalog # 10015-CD) is immobilized at 1 µg/mL, Biotinylated Recombinant CD81 Fc Chimera binds with an ED50 of 2-10 μg/mL.
Recombinant Human CD9-LEL Fc Chimera Protein SDS-PAGE

Recombinant Human CD9-LEL Fc Chimera Protein SDS-PAGE

2 μg/lane of Recombinant Human CD9 was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 38-42 kDa and 75-85 kDa, respectively.

Formulation, Preparation and Storage

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 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, ≤ -20 °C under sterile conditions after reconstitution.

Background: CD9

CD9, also known as Tspan29, is a 24-27 kDa cell surface protein belonging to the tetraspanin family (1). Common to other tetraspanins, CD9 is composed of four transmembrane domains, short N- and C-terminal cytoplasmic domains, and two extracellular loops. The larger extracellular loop, referred to as the LEL or EC2, contains highly conserved CCG and PXSC motifs (2, 3). The LEL mediates noncovalent protein-protein interactions, allowing tetraspanins to associate with each other as well as signaling molecules, structural proteins, and G-protein coupled receptors (4-6). Human CD9 is expressed in multiple cell and tissue types and has been identified in diverse biological roles due to its involvement in the formation of tetraspanin-enriched microdomains (TEMs). TEMs are associated with numerous processes ranging from cell adhesion and fusion, membrane trafficking, and endocytosis to leukocyte adherence and motility (4-7). These tetraspanin-enriched microdomains (TEMs) are associated with a wide range of functions from cell adhesion and fusion, membrane trafficking and endocytosis, and eukocyte adherence and motility. The LEL of human CD9 shares 77% and 84% amino acid sequence identity with mouse and rat CD9, respectively.  CD9 can form homodimers or interact with other proteins including CD117, CD29, CD46, CD49c, CD81, CD315, Tspan4, TGF-alpha, and HBEGF (1, 4, 8-13). Increased expression of CD9 has been shown to enhance transmembrane TGF-alpha -induced EGFR stimulation (1), and injection of human CD9 mRNA into CD9 knock-out mouse oocytes restored sperm-egg fusion (14). CD9-LEL may also be involved in the inhibition of multinucleated giant cell formation (3) as well as possess anti-adhesive effects against bacteria trying to invade mammalian cells (6, 15). CD9 interacts with integrins to regulate cell adhesion and motility (16-18). CD9 has been implicated in platelet activation and aggregation (17, 19). It may act as the terminal signal of myelination in the peripheral nervous system and can regulate the formation of paranodal junctions (20). Also, it has been suggested CD9 plays an important role both in the self-antigen and recall antigen-induced T cell activation (21).


  1. Shi, W. et al. (2000) J. Cell Biol. 148:591.
  2. Hemler, M. (2003) Annu Rev Cell Biol. 19:397.
  3. Hulme, R. et al. (2014) PLoS One 9:e116289.
  4. Stipp, C. et al. (2003) Trends Biochem Sci. 28:106.
  5. Barreiro, O. et al. (2005) Blood 105:2852.
  6. Ventress, J. et al. (2016) PLoS One 11:e0160387.
  7. Rubinstein, E. (2011) Biochem Soc Trans. 39:501.
  8. Anzai, N. et al. (2002) Blood 99:4413.
  9. Radford, K. et al. (1996) Biochem. Biophys. Res. Commun. 222:13.
  10. Lozahic, S. et al. (2000) Eur. J. Immunol. 30:900.
  11. Park, K. et al. (2000) Mol. Hum. Reprod. 6:252.
  12. Charrin, S. et al. (2001) J. Biol. Chem. 276:14329.
  13. Tachibana, I. et al. (1997) J. Biol. Chem. 272:29181.
  14. Zhu, G. et al. (2002) Development 129:1995.
  15. Green, L. et al. (2011) Infect Immun. 79:2241.
  16. Powner, D. et al. (2011) Biochem. Soc. Trans. 39:563.
  17. Detchokul, S. et al. (2014) British Journal of Pharmacology 171:5462.
  18. Reyes, R. et al. (2018) Front. Immunol. 9:863.
  19. Slupsky, J. et al. (1989) J Biol chem. 264:12289.
  20. Ishibashi, T. et al. (2004) J. Neuroscience 24:96.
  21. Kobayashi, H. et al. (2004) Clin Exp Immunol. 137:101.

Alternate Names

CD9, DRAP-27, MIC3, p24, TSPAN29

Entrez Gene IDs

928 (Human); 12527 (Mouse)

Gene Symbol



Additional CD9 Products

Product Documents for Recombinant Human CD9-LEL Fc Chimera Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant Human CD9-LEL Fc Chimera Protein, CF

For research use only

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.