Involved in the recognition of invading microorganisms. Binds specifically to beta-1,3-glucan and lipoteichoic acid and causes aggregation of invading microorganisms. Binding to beta-1,3-glucan activates the phenoloxidase cascade. Monomer. Cuticle and fat body. Expression levels are low during larval feeding stages and increase dramatically at the start of the wandering stage. By bacterial and yeast infection. N-glycosylated. Belongs to the insect beta-1,3-glucan binding protein family.