Binds to lipopolysaccharides (LPS) present on the cell walls of Gram-negative bacteria, behaving as a pattern recognition receptor (PRR) (PubMed:16849495). Induces bacterial aggregation and enhances their subsequent clearance by the innate immune response (PubMed:16849495). Binds to the inner core oligosaccharides region of rough-type bacterial LPS (PubMed:16849495). Displays activity against the Gram-negative bacterium E.coli (PubMed:16849495). Does not display any activity against the Gram-positive bacterium S.aureus or the fungi C.albicans (PubMed:16849495). Detected in larval plasma. In mouse bone marrow-derived mast cells (BMMC), inhibits LPS-induced expression of the inflammatory cytokine Interleukin-6 (IL-6).