Abstract
Peptidoglycan recognition proteins (PGRPs) are non-specific immune molecules of insects, and vertebrates etc., but are not present in plants and nematodes. In the current experiment, a PGRP DNA sequence (2,910 bp containing four exons) was identified from genomic DNA library of Asian corn borer, Ostrinia furnacalis, and a full-length cDNA programming PGRP was cloned (designed as OfPGRP-S) with an open reading frame of 579 bp, having 192 amino acid. This inferred amino acid sequence showed maximum similarity to known lepidopteran PGRPs. Quantitative real-time PCR investigation disclosed the level of mRNA of OfPGRP-S to be constitutively expressed in the whole developmental stages and with higher expression in the mature larvae. Even more the OfPGRP-S was mainly expressed in immune capable organs i.e., fat body and midgut, and was strongly induced by injecting gram-positive bacteria i.e., Staphylococus aureus. Recombinant protein OfPGRP-S could bind to S. aureus and Bacillus thuringiensis which enhance proPO activation in the presence of these microbes. The results indicated that OfPGRP-S is an inducible protein acting as a receptor-type PGRP for enhancing the proPO activation on exposure to bacteria.
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This work was supported by grant from the National Natural Science Foundation of China (31071734; 30900943) and the National Postdoctoral Foundation of China (20080430838).
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Qiang Sun and Xiao-Xia Xu have contributed equally to this work.
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Sun, Q., Xu, XX., Freed, S. et al. Molecular characterization of a short peptidoglycan recognition protein (PGRP-S) from Asian corn borer (Ostrinia furnacalis) and its role in triggering proPO activity. World J Microbiol Biotechnol 30, 263–270 (2014). https://doi.org/10.1007/s11274-013-1449-3
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DOI: https://doi.org/10.1007/s11274-013-1449-3