251. Characterization of PGRP-S1 from the oriental armyworm, Mythimna separata.
- Author
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Yang PJ, Zhan MY, Yang LL, Liu QQ, Xu Y, Pan YM, and Rao XJ
- Subjects
- Animals, Anti-Bacterial Agents metabolism, Carrier Proteins metabolism, Cloning, Molecular, Immunity, Innate, Insect Proteins metabolism, Lepidoptera immunology, Peptidoglycan metabolism, Receptors, Pattern Recognition metabolism, Recombinant Proteins genetics, Bacillus subtilis physiology, Carrier Proteins genetics, Hemocytes physiology, Insect Proteins genetics, Receptors, Pattern Recognition genetics, Staphylococcal Infections immunology, Staphylococcus aureus physiology
- Abstract
Peptidoglycan is the key component forming the backbone of bacterial cell wall. It can be recognized by a group of pattern recognition receptors, known as peptidoglycan recognition proteins (PGRPs) in insects and higher animals. PGRPs may serve as immune receptors or N-acetylmuramoyl-L-alanine amidases (EC 3.5.1.28). Here, we report the characterization of a short PGRP, PGRP-S1, from the oriental armyworm, Mythimna separata. MsePGRP-S1 cDNA encodes a protein of 197 amino acids (aa) with a PGRP domain of about 150 aa. MsePGRP-S1 was expressed in several tissues of naïve larvae, including hemocytes, midgut, fat body and epidermis. Bacterial challenges caused variable changes in different tissues at the mRNA level. The recombinant protein bound strongly to Staphylococcus aureus and purified peptidoglycans from Staphylococcus aureus and Bacillus subtilis. It can inhibit the growth of gram-negative and gram-positive bacteria by disrupting bacterial surface. It can degrade peptidoglycans from Escherichia coli and Staphylococcus aureus. Taken together, these data demonstrate that M. separata PGRP-S1 is involved in defending against bacteria., (Copyright © 2018 Elsevier Ltd. All rights reserved.)
- Published
- 2019
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