Plays a role in the recognition of invading microorganisms activating the phenoloxidase cascade (By similarity). Binds specifically to beta-1,3-glucan (By similarity). Binds the Aspergillus niger cell wall component alpha-1,3-glucan, a fungal pathogen-associated molecular pattern (PAMP) that activates the host immune response (PubMed:34443685). Monomer. Secreted in the hemolymph. Hemolymph. Belongs to the insect beta-1,3-glucan binding protein family.