Skip to main content

Novus Biologicals products are now on

Better as one

Recombinant Human TLR3 Protein, CF

Catalog # 1487-TR | R&D Systems, Inc. a Bio-Techne Brand
Catalog #
Size / Price

Key Product Details



Accession #





Product Specifications


Mouse myeloma cell line, NS0-derived human TLR3 protein
Lys27-Ser711, with a C-terminal 10-His tag


>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.

Endotoxin Level

<0.10 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis


Predicted Molecular Mass

79.2 kDa


110-120 kDa, reducing conditions


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.

Formulation, Preparation and Storage

Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitute at 400 μg/mL in sterile PBS.

Reconstitution Buffer Available:
Size / Price
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.

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

Alternate Names


Entrez Gene IDs

7098 (Human); 142980 (Mouse); 364594 (Rat)

Gene Symbol



Additional TLR3 Products

Product Documents for Recombinant Human TLR3 Protein, CF

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant Human TLR3 Protein, CF

For research use only

Citations for Recombinant Human TLR3 Protein, CF (6)

Showing  1 - 6 of 6 publications Showing All
Filter By:
Search Title:

Citations are publications that use Bio-Techne products. Selected citations for Recombinant Human TLR3 Protein, CF include:

There are no citations that match your criteria.

Showing  1 - 6 of 6 publications Showing All

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.

Setting the standard in quality research reagents