Shows antibacterial activity against Gram-positive bacterium M.luteus but shows no activity against Gram-negative bacterium E.coli (PubMed:25098233). Likely to play a role in the eradication of ingested pathogens during their passage through the intestine (Probable). Expressed only in the midgut where it is restricted to the first half in all larval stages (PubMed:25098233). Expression initiates at the base of the caeca, proceeds throughout the first half of the midgut and gradually stops at the middle of the midgut (PubMed:25098233). Belongs to the glycosyl hydrolase 22 family. Although it belongs to the glycosyl hydrolase 22 family, Gly-51 is present instead of the conserved Glu which is an active site residue. It is therefore expected that this protein lacks hydrolase activity.