Toll-like receptor 2–Toll-like receptor 1 heterodimer (TLR2–TLR1 heterodimer)

Toll-like receptor 2–Toll-like receptor 1 heterodimer is a cell-surface pattern recognition receptor complex composed of TLR2 and TLR1 subunits. This heterodimer, primarily located on immune cells such as macrophages and dendritic cells, recognizes specific microbial components, notably triacylated lipopeptides from bacteria, leading to activation of the innate immune response[3][4][6]. Ligand binding induces the formation of an “m”-shaped extracellular domain arrangement, driving close apposition of intracellular TIR (Toll/interleukin-1 receptor) domains and triggering downstream signaling involving the adapter protein MyD88, resulting in production of pro-inflammatory cytokines and type I interferons[4][5][6]. This receptor complex is crucial for early defense against pathogens but is also implicated in inflammatory and autoimmune pathology when dysregulated[3][7][8]. Experimental agonists like Pam3CSK4 and CU-T12-9 specifically activate the TLR2/1 dimer, and its modulation is under investigation for various infectious, inflammatory, and oncological conditions[6][8].

Other names

TLR2/1 heterodimerTLR1/2 complexTLR1–TLR2 receptor complex

Agonists or ligands induce dimerization, triggering downstream signaling via MyD88 and activation of NF-κB and inflammatory cytokine production; Recognition of triacylated lipopeptides and subsequent immune activation