Proteomic Analysis of the Peritrophic Matrix from the Midgut of Third Instar Larvae,Musca domestica

Key words: 
• Musca domestica /
• Peritrophic matrix /
• Proteome

Abstract: ObjectiveTo better comprehend the molecular structure and physiological functionof the housefly larval peritrophic matrix (PM), a mass spectrometry approach wasused to investigate the PM protein composition. MethodsThe PM was dissected from the midgut of the third instar larvae,and protein extracted from the PM wasevaluated using SDS-PAGE. A 1D-PAGE lane containing all protein bandswascut fromtop to bottom, the proteins in-geltrypsinised and analysedvia shotgun liquid chromatography- tandem mass spectrometry (LC-MS/MS). ResultsIn total, 374 proteins, with molecular weightsvarying from 8.225 kD to996.065 kD and isoelectric points ranging from 3.83 to 11.24 were successfully identified, most identified proteins were mainly related to immunity, digestion,nutrient metabolism and PM structure. Furthermore, many of these proteins were functionally associated with pattern binding, polysaccharide binding, structural constituent of peritrophic membrane and chitin binding, according to Gene Ontology annotation. ConclusionThe PM protein composition, which provides a basis for further functional investigations of the identified proteins,will be useful for understanding the housefly larval gut immune system and may help to identify potential targets and exploit new bioinsecticides.