lmmol · Proteins

Toll-like receptor 2

UniProt O60603 Organism Homo sapiens Gene TIL4, TLR2

Also known as: TIL4, TLR2

Function

Cooperates with LY96 to mediate the innate immune response to bacterial lipoproteins and other microbial cell wall components. Cooperates with TLR1 or TLR6 to mediate the innate immune response to bacterial lipoproteins or lipopeptides. Acts via MYD88 and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response. May also activate immune cells and promote apoptosis in response to the lipid moiety of lipoproteins. Recognizes mycoplasmal macrophage-activating lipopeptide-2kD (MALP-2), soluble tuberculosis factor (STF), phenol-soluble modulin (PSM) and B.burgdorferi outer surface protein A lipoprotein (OspA-L) cooperatively with TLR6. Stimulation of monocytes in vitro with M.tuberculosis PstS1 induces p38 MAPK and ERK1/2 activation primarily via this receptor, but also partially via TLR4. MAPK activation in response to bacterial peptidoglycan also occurs via this receptor. Acts as a receptor for M.tuberculosis lipoproteins LprA, LprG, LpqH and PstS1, some lipoproteins are dependent on other coreceptors (TLR1, CD14 and/or CD36); the lipoproteins act as agonists to modulate antigen presenting cell functions in response to the pathogen. M.tuberculosis HSP70 (dnaK) but not HSP65 (groEL-2) acts via this protein to stimulate NF-kappa-B expression. Recognizes M.tuberculosis major T-antigen EsxA (ESAT-6) which inhibits downstream MYD88-dependent signaling (shown in mouse) (By similarity). Forms activation clusters composed of several receptors depending on the ligand, these clusters trigger signaling from the cell surface and subsequently are targeted to the Golgi in a lipid-raft dependent pathway. Forms the cluster TLR2:TLR6:CD14:CD36 in response to diacylated lipopeptides and TLR2:TLR1:CD14 in response to triacylated lipopeptides. Required for normal uptake of M.tuberculosis, a process that is inhibited by M.tuberculosis LppM (By similarity).

Classification

Family (Pfam)
PF00560 LRR_1, PF13855 LRR_8, PF01463 LRRCT, PF01582 TIR
InterPro
Cys-rich_flank_reg_C, Leu-rich_rpt, Leu-rich_rpt_typical-subtyp, LRR_dom_sf, TIR_dom, Toll-like_receptor, Toll_tir_struct_dom_sf
Functional cluster
Immunoglobulin & Immune-Response Proteins

Experimental structures · PDB · 7

A predicted model is available from AlphaFold.

Gene Ontology · 59

Disease associations

Drugs targeting this protein · 1

Related proteins · sequence + function similarity

Co-cited proteins · studied together in the literature

Literature · 28 cited papers

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