Recombinant Human TLR3 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Recombinant Human TLR3 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 poly I:C induced IL-8 secretion by HEK293 human embryonic kidney cells transfected with TLR3. The ED50 for this effect is 2-12 µg/mL in the presence of 0.2 µg/mL of poly I:C.
Mouse myeloma cell line, NS0-derived human TLR3 protein
Lys27-Ser711, with a C-terminal 10-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
79.2 kDa
110-120 kDa, reducing conditions

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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 400 μg/mL in sterile 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.
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Background: TLR3

Human TLR3 is a 116 kDa type I transmembrane glycoprotein that belongs to the mammalian Toll-Like Receptor family of pathogen pattern recognition molecules (1, 2). There are at least eleven mouse and ten human members that activate the innate immune system following exposure to a variety of microbial species (3). The human TLR3 cDNA encodes a 904 amino acid (aa) precursor that contains a 23 aa signal sequence, a 681 aa extracellular domain (ECD), a 21 aa transmembrane segment, and a 179 aa cytoplasmic region (4). The horseshoe shaped ECD (5, 6) contains 23 leucine rich repeats, and the cytoplasmic domain contains one Toll/IL-1 receptor (TIR) domain. The ECD of human TLR3 shares 80%, 79%, and 77% aa sequence identity with the ECD of rat, mouse, and bovine TLR3, respectively. TLR3 is found in phagosomes (7), where the acidic pH enables binding of internalized double stranded RNA and mRNA from viruses, parasites, and necrotic virally-infected cells (8-11). Ligand binding by TLR3 induces receptor dimerization (5, 6, 8) leading to the release of inflammatory cytokines and dendritic cell maturation (9, 11-13). TLR3 is expressed in dendritic cells, macrophages, microglia, and astrocytes (13-15) and is upregulated by IFN-beta and LPS (9, 14). TLR3 expression is also induced by lung fibroblasts and epithelial cells by respiratory syncytial virus infection (12).

  1. Sen, G.C. and S.N. Sarkar (2005) Cytokine Growth Factor Rev. 16:1.
  2. Schroder, M. and A.G. Bowie (2005) Trends Immunol. 26:462.
  3. Hopkins, P.A. and S. Sriskandan (2005) Clin. Exp. Immunol. 140:395.
  4. Rock, F.L. et al. (1998) Proc. Natl. Acad. Sci. 95:588.
  5. Choe, J. et al. (2005) Science 309:581.
  6. Bell, J.K. et al. (2005) Proc. Natl. Acad. Sci. 102:10976.
  7. Nishiya, T. et al. (2002) J. Biol. Chem. 280:37107.
  8. de Bouteiller, O. et al. (2005) J. Biol. Chem. 280:38133.
  9. Alexopoulou, L. et al. (2001) Nature 413:732.
  10. Aksoy, E. et al. (2005) J. Biol. Chem. 280:277.
  11. Kariko, K. et al. (2004) J. Biol. Chem. 279:12542.
  12. Rudd, B.D. et al. (2005) J. Virol. 79:3350.
  13. Farina, C. et al. (2005) J. Neuroimmunol. 159:12.
  14. Heinz, S. et al. (2003) J. Biol. Chem. 278:21502.
  15. Wang, T. et al. (2004) Nat. Med. 10:1366.
Long Name
Toll-like Receptor 3
Entrez Gene IDs
7098 (Human); 142980 (Mouse); 364594 (Rat)
Alternate Names
CD283 antigen; CD283; TLR3; toll-like receptor 3

Citations for Recombinant Human TLR3 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.

6 Citations: Showing 1 - 6
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  1. Toll-like Receptor 2 Antagonists Identified through Virtual Screening and Experimental Validation
    Authors: P Durai, HJ Shin, A Achek, HK Kwon, RG Govindaraj, S Panneersel, D Yesudhas, J Choi, KT No, S Choi
    FEBS J., 2017;0(0):.
    Species: N/A
    Sample Types: Recombinant Protein
    Applications: Surface Plasmon Resonance
  2. Cleaved/associated TLR3 represents the primary form of the signaling receptor.
    Authors: Toscano F, Estornes Y, Virard F, Garcia-Cattaneo A, Pierrot A, Vanbervliet B, Bonnin M, Ciancanelli M, Zhang S, Funami K, Seya T, Matsumoto M, Pin J, Casanova J, Renno T, Lebecque S
    J Immunol, 2013;190(2):764-73.
    Species: Mouse
    Sample Types: In Vivo
    Applications: Antibody Production
  3. dsRNA induces apoptosis through an atypical death complex associating TLR3 to caspase-8.
    Cell Death Differ., 2012;19(9):1482-94.
    Species: Mouse
    Sample Types: In Vivo
    Applications: In Vivo
  4. TLR3 and Rig-like receptor on myeloid dendritic cells and Rig-like receptor on human NK cells are both mandatory for production of IFN-gamma in response to double-stranded RNA.
    Authors: Perrot I, Deauvieau F, Massacrier C
    J. Immunol., 2010;185(4):2080-8.
    Species: Human
    Sample Types: Complex Sample Type
    Applications: Surface Plasmon Resonance
  5. Oxidative stress enhances toll-like receptor 3 response to double-stranded RNA in airway epithelial cells.
    Authors: Koarai A, Sugiura H, Yanagisawa S
    Am. J. Respir. Cell Mol. Biol., 2010;42(6):651-60.
    Applications: Western Blot
  6. Activation of Toll-like receptor 3 augments myofibroblast differentiation.
    Authors: Sugiura H, Ichikawa T, Koarai A, Yanagisawa S, Minakata Y, Matsunaga K, Hirano T, Akamatsu K, Ichinose M
    Am. J. Respir. Cell Mol. Biol., 2009;40(6):654-62.
    Species: N/A
    Sample Types: N/A
    Applications: Western Blot


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