Genes encoding three proteins (McPPAD1-3) with peritrophin A chitin-binding domains (PADs) were identified from a Mamestra configurata larval midgut cDNA library. In addition to midgut, McPPAD1-3 and a previously identified gene encoding the peritrophin, McPM1, were expressed in foregut, hindgut, Malpighian tubules, tracheae, fat body and cuticle; however, the corresponding McPPAD proteins exhibited different localization patterns. McPPAD1 was restricted to the digestive tract and Malpighian tubules, McPPAD2 to Malpighian tubules, and McPPAD3 to the foregut, midgut, hindgut, tracheae and cuticle. Protein fold recognition analysis using tachycitin as a guide structure modelled the McPPAD1 PADs, but not McPPAD2 or McPPAD3 PADs. The McPPAD1 PADs were predicted to contain three anti-parallel β-sheets and a hevein-like fold that form a chitin-binding pocket containing two hydrophobic R-groups in a sandwich-like orientation.
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