TLR9 Antibody (1138D) [Alexa Fluor® 647]


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Product Details

Reactivity MuSpecies Glossary
Applications Flow
Alexa Fluor 647

TLR9 Antibody (1138D) [Alexa Fluor® 647] Summary

Additional Information
Recombinant Monoclonal Antibody.
Chinese hamster ovary cell line CHO-derived recombinant mouse TLR9
Accession # AAK29625
Detects mouse TLR-9 in direct ELISAs.
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  • Flow Cytometry 0.25-1 ug/10^6 cells

Packaging, Storage & Formulations

Store the unopened product at 2 - 8 °C. Do not use past expiration date.
Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.


This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for TLR9 Antibody (1138D) [Alexa Fluor® 647]

  • CD289 antigen
  • CD289
  • TLR9
  • toll-like receptor 9


TLR9 (Toll‑like receptor 9), designated CD289, is a member of the TLR family of innate immune receptors that is mainly expressed by colonic epithelium, CD123+ plasmacytoid predendritic cells (pDC), and splenic transitional B cells (1‑9). TLR9 responds to unmethylated DNA CpG motifs that occur mainly in bacteria and viruses (1, 2). Mouse TLR9 cDNA encodes a 1032 amino acid (aa) type I transmembrane glycoprotein with a 793 aa extracellular domain (ECD) that contains 26 leucine‑rich repeats (LRRs, aa 26‑818), and a 193 aa cytoplasmic domain with a TIR sequence that dimerizes with signaling adaptors such as MyD88 (1). The mouse TLR9 ECD shares 87% aa sequence identity with rat and 71‑74% with human, feline, canine, equine, porcine, bovine and ovine TLR9. Predicted splice forms vary at the N‑terminus by initiating either upstream or downstream of the standard site. The full-length 150 kDa form, which is ligand‑binding but nonsignaling, is found in the endoplasmic reticulum. It undergoes accessory protein-mediated translocation either to the cell membrane or to lysosomes (1‑3). TLR9 is cleaved to remove LRR1‑14, producing an 80 kDa signaling fragment within acidic endolysosomes where it encounters microbial CpG DNA rather than self-DNA (2, 10, 11). However, immune complexes of self‑DNA with lupus erythematosus anti‑DNA antibodies can induce TLR9 activation and IFN‑ alpha production in pDC (4). A soluble form also found in endosomes includes all 26 LRRs and negatively regulates active TLR9 (12). Activation of TLR9 contributes to splenocyte proliferation, pDC maturation, macrophage inflammatory cytokine production, Th1 inflammatory responses, NK cell activation and recruitment, B cell surface MHC class II up‑regulation and immunoglobulin production, and generation and maintenance of memory B cells (1, 5‑9).

  1. Hemmi, H. et al. (2000) Nature 408:740.
  2. Barton, G.M. et al. (2006) Nat. Immunol. 7:49.
  3. Latz, E. et al. (2004) Nat. Immunol. 5:190.
  4. Barrat, F.J. et al. (2005) J. Exp. Med. 202:1131.
  5. Krieg, A.M. et al. (1995) Nature 374:546.
  6. Aranburu, A. et al. (2010) J. Immunol. 185:7293.
  7. Guerrier, T. et al. (2012) J. Autoimmun. 39:173.
  8. Guillerey, C. et al. (2012) Blood 120:90.
  9. Cunningham-Rundles, C. et al. (2006) J. Immunol. 176:1978.
  10. Ewald, S.E. et al. (2008) Nature 456:658.
  11. Park, B. et al. (2008) Nat. Immunol. 9:1407.
  12. Chockalingam, A. et al. (2011) Eur. J. Immunol. 41:2176.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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Blogs on TLR9.

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MHC Class I and the Herpes Simplex Virus
MHC molecules (also known as major histocompatibility complex molecules) assist in the presentation of antigens to T cells in order to eradicate foreign pathogens.  These molecules are highly polymorphic, meaning that they exist in multiple varian...  Read full blog post.

The role of TLR4 in breast cancer
Toll like receptors (TLRs) are highly conserved proteins that are first known for their role in pathogen recognition and immune response activation.  In order to elicit the necessary immune response in reaction to a foreign pathogen, TLRs trigger cy...  Read full blog post.

IRAK4: The "master IRAK" critical for initiating immune responses
IRAK4, also known as Interleukin-1 receptor-associated kinase 4, is a serine/threonine-protein kinase that plays a critical role in initiating innate and adaptive immune responses against foreign pathogens. It activates NF-kappaB in both Toll-like rec...  Read full blog post.

TLR9: For Whom the Cell Tolls
The Toll-like receptor 9 (TLR9) protein, also known as CD289, belongs to the family of Toll-like receptor (TLR) proteins which play a large role in pathogen recognition and the activation of innate immunity. Scientists using TLR9 antibodies have found...  Read full blog post.

TLR9: Tollgate to Immunity
Toll-like receptors (TLRs) play an essential role in the activation of innate immunity, and TLRs are expressed in a large number of immune cells as well as in epithelial cells. TLR9 recognizes synthetic oligodeoxynucleotides (ODN) containing unmethyla...  Read full blog post.

TLR9, Infectious Disease and Cancer
Toll-like receptor 9 (TLR9) is a protein encoded by TLR9 gene in humans. It is also known as cluster of differentiation 289 (CD289) and is a member of TLR family. Proteins from TLR family are transmembrane proteins that expressed in both antigen-resen...  Read full blog post.

TLR9 Antibodies in Immunity Research
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