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Qiao Peitong,Mei Xianghan,Li Ruixiang,Zhao Qiaoling,Xia Dingguo,Qiu Zhiyong,Shen Dongxu 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.4
Peptidoglycan recognition proteins (PGRPs) discriminate and bind peptidoglycans by acting as pattern recog nition receptors (PRRs) in insects, and function pivotal roles in innate immune response. In the present study, we cloned a full-length PGRP gene designed as OfPGRP8 from the Asian corn borer, Ostrinia furnacalis (Guenée). Its mRNA exhibited the highest abundance in fat body, and its expression level upregulated dramatically after bacterial challenges. Purified recombinant OfPGRP8 exhibited intensive binding capacity to peptidoglycans from Staphylococcus aureus and Micrococcus luteus. Additionally, recombinant OfPGRP8 could inhibit the growth of S. aureus, M. luteus. However, recombinant OfPGRP8 could not cause agglutination of S. aureus, M. luteus or Escherichia coli. Furthermore, we also demonstrated that OfPGRP8 may be involved in modulating the signaling pathway of antimicrobial peptides (AMPs) synthesis. In sum, our results provided evidence that OfPGRP8 dis criminates peptidoglycans from microbes and acts as a PRR to initiate downstream immune signaling pathways.