Identification of Bacterial Proteins in the Gut of Sunn pest, Eurygaster integriceps

Proteomics is a powerful tool to identify effective proteins in the biochemical reactions of the insect body. Many proteins were reported in the gut lumen and tissues which are essential to complete the physiological role of the alimentary canal of Sunn pest. The gut microbiome of insects has a key role in the digestive process. In this study, for the first time, gut proteins of adult Sunn pest were extracted. These proteins were visualized and identified with two-dimensional polyacrylamide gel electrophoresis and mass spectrometry, respectively. Newly identified proteins include pyruvate dehydrogenase, oxidoreductase FAD-binding protein, hypothetical proteins, glycerol-3 phosphate dehydrogenase, conserved hypothetical proteins, ABC excinucleases, ABC-type transport systems and molecular chaperones. The accumulation of these metabolism proteins in the gut of Sunn pest indicates the importance of symbiotic proteins in the improvement of digestive activities and insect-bacteria interactions. Results suggest that the identified bacterial proteins can be considered as effective proteins in the process of nutrition and provide more gut-derived targets for enzyme engineering and development of biopesticides