Abstract
Gloverin restricted to Lepidoptera is known to be a glycine-rich and heat stable antimicrobial protein. The current research reports a 650 bp full-length cDNA encoding gloverin from Plutella xylostella (PxGlo) by reverse transcription polymerase chain reaction and rapid amplification of cDNA ends. PxGlo transcript was detected in both developmental stages and several tissues of 4th instar naïve larvae of P. xylostella with higher levels in the fat bodies. The mRNA levels of PxGlo increased appreciably in fat bodies after injection of Escherichia coli K12. The recombinant PxGlo expressed in S2 cells was purified by Anti-V5 M2 agarose beads which showed high activity against E. coli K12, while low activity against Bacillus thuringiensis, Staphylococcus aureus and E. coli D31. The analysis of transmission electron microscope and scan electron microscope showed PxGlo to cause significant morphological alteration in the E. coli K12 cell surface. Knockdown of PxGlo expression by RNAi increased the larval susceptibility towards the pathogenic bacteria i.e., Serratia marcescens and B. thuringiensis. Our results showed that PxGlo is an inducible antibacterial peptide which exhibits high activity mainly against E. coli K12, and PxGlo performs vital roles against the infection of pathogenic bacteria.
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This work was supported by grant from the National Natural Science Foundation of China (31071734; 31371989; 30900943). We also thank editors, anonymous referees for their invaluable comments and suggestions.
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X. X. Xu and F. L. Jin have contributed equally to this work.
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Xu, X.X., Jin, F.L., Wang, Y.S. et al. Molecular cloning and characterization of gloverin from the diamondback moth, Plutella xylostella L. and its interaction with bacterial membrane. World J Microbiol Biotechnol 31, 1529–1541 (2015). https://doi.org/10.1007/s11274-015-1901-7
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DOI: https://doi.org/10.1007/s11274-015-1901-7