TLR9 Antibody – Mouse Monoclonal

The protein encoded by this gene is a member of the Toll-like receptor (TLR) family which plays a fundamental role in pathogen recognition and activation of innate immunity. TLRs are highly conserved from Drosophila to humans and share structural and functional similarities. They recognize pathogen-associated molecular patterns (PAMPs) that are expressed on infectious agents, and mediate the production of cytokines necessary for the development of effective immunity. The various TLRs exhibit different patterns of expression. This gene is preferentially expressed in immune cell rich tissues, such as spleen, lymph node, bone marrow and peripheral blood leukocytes. Studies in mice and human indicate that this receptor mediates cellular response to unmethylated CpG dinucleotides in bacterial DNA to mount an innate immune response. [provided by RefSeq, Jul 2008]

TLR9: Key component of innate and adaptive immunity. TLRs (Toll-like receptors) control host immune response against pathogens through recognition of molecular patterns specific to microorganisms. TLR9 is a nucleotide-sensing TLR which is activated by unmethylated cytidine-phosphate-guanosine (CpG) dinucleotides. Acts via MYD88 and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response. Controls lymphocyte response to Helicobacter infection. Interacts with MYD88 via their respective TIR domains. Interacts (via transmembrane domain) with UNC93B1. Interacts with CD300LH; the interaction may promote full activation of TLR9-triggered innate responses. Interacts with BTK. Interacts with CNPY3 and HSP90B1; this interaction is required for proper folding in the endoplasmic reticulum. Highly expressed in spleen, lymph node, tonsil and peripheral blood leukocytes, especially in plasmacytoid pre- dendritic cells. Levels are much lower in monocytes and CD11c+ immature dendritic cells. Also detected in lung and liver. Belongs to the Toll-like receptor family. 5 isoforms of the human protein are produced by alternative splicing.

Protein type: Membrane protein, integral; Receptor, misc.

Chromosomal Location of Human Ortholog: 3p21.3

Cellular Component: Golgi membrane; endoplasmic reticulum membrane; basolateral plasma membrane; lysosome; endoplasmic reticulum; apical plasma membrane; cytoplasm; plasma membrane; integral to membrane; extracellular region; endosome membrane; endosome

Molecular Function: interleukin-1 receptor binding; siRNA binding; transmembrane receptor activity

Biological Process: positive regulation of JNK activity; regulation of cytokine secretion; positive regulation of interleukin-12 production; maintenance of gastrointestinal epithelium; positive regulation of JNK cascade; positive regulation of NF-kappaB import into nucleus; positive regulation of interferon-alpha biosynthetic process; defense response to Gram-negative bacterium; positive regulation of interleukin-18 production; positive regulation of interleukin-10 production; activation of NF-kappaB transcription factor; positive regulation of interleukin-8 production; response to molecule of bacterial origin; positive regulation of interferon-beta production; negative regulation of interleukin-6 production; negative regulation of interleukin-8 production; inflammatory response; positive regulation of I-kappaB kinase/NF-kappaB cascade; positive regulation of interleukin-6 production; positive regulation of tumor necrosis factor production; positive regulation of toll-like receptor signaling pathway; positive regulation of chemokine production; MyD88-dependent toll-like receptor signaling pathway; inhibition of NF-kappaB transcription factor; positive regulation of interferon-beta biosynthetic process; defense response to bacterium; toll-like receptor signaling pathway; insulin receptor signaling pathway; negative regulation of toll-like receptor signaling pathway; innate immune response; positive regulation of transcription from RNA polymerase II promoter; toll-like receptor 9 signaling pathway; I-kappaB phosphorylation; positive regulation of interferon-gamma biosynthetic process; positive regulation of nitric-oxide synthase biosynthetic process; positive regulation of inflammatory response