Participates in the innate immune response to microbial agents. Acts via MYD88 and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response (By similarity). Does not respond to LPS and responds with less ability than TLR2-2 to mycoplasmal macrophage-activating lipopeptide-2kD (MALP-2). Binds MYD88 (via TIR domain). Highly expressed in ovary. Detected at lower levels in heart, lung, gizzard and testis. N-glycosylated. TLR2-1 is more heavily glycosylated than TLR2-2. Belongs to the Toll-like receptor family. In some plant proteins and in human SARM1, the TIR domain has NAD(+) hydrolase (NADase) activity (By similarity). However, despite the presence of the catalytic Asp residue, the isolated TIR domain of human TLR4 lacks NADase activity (By similarity). Based on this, it is unlikely that Toll-like receptors have NADase activity.