Abstract |
Peptidoglycan recognition proteins (PGRPs) specifically bind to peptidoglycan and play an important role in the innate immune responses as pattern recognition receptors ( PRRs). Here we identified and characterized two PGRPs (HaPGRP-B and HaPGRP-C) from the cotton bollworm, Helicoverpa armigera. The comparative analysis indicated that five amino acids which are required for T7 lysozyme Zn(2+) binding and amidase activity are conserved in HaPGRP-B and HaPGRP-C, suggesting that the two PGRPs are members of the amidase-type PGRPs. HaPGRP-B and HaPGRP-C mRNA increased in both the fat bodies and the hemocytes after an injection of Gram-negative Escherichia coli or Gram-positive Staphylococcus aureus. Recombinant HaPGRP-B and HaPGRP-C could agglutinate E. coli and S. aureus in a zinc-dependent manner. More importantly, both rHaPGRP-B and rHaPGRP strongly inhibited the growth of E. coli and S. aureus in the presence of Zn(2+). Moreover, the HaPGRP-B mRNA showed up-regulation post hormones (20E and methoprene) injection. Our results indicate that the two PGRPs of H. armigera may play an important role in defending against bacteria as amidase-type PGRPs and the hormones can function in regulating the expressions of PGRPs.
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Authors | Dai-Qun Yang, Zhen-Lin Su, Chuan Qiao, Zan Zhang, Jia-Lin Wang, Fei Li, Xu-Sheng Liu |
Journal | Developmental and comparative immunology
(Dev Comp Immunol)
Vol. 39
Issue 4
Pg. 343-51
(Apr 2013)
ISSN: 1879-0089 [Electronic] United States |
PMID | 23295246
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2013 Elsevier Ltd. All rights reserved. |
Chemical References |
- Anti-Bacterial Agents
- Carrier Proteins
- RNA, Messenger
- Recombinant Proteins
- peptidoglycan recognition protein
- Amidohydrolases
- N-Acetylmuramoyl-L-alanine Amidase
- amidase
- Zinc
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Topics |
- Amidohydrolases
(metabolism)
- Amino Acid Sequence
- Animals
- Anti-Bacterial Agents
(metabolism)
- Base Sequence
- Carrier Proteins
(chemistry, genetics, immunology, metabolism)
- Escherichia coli
(drug effects)
- Immunity, Innate
- Microbial Sensitivity Tests
- Moths
(metabolism)
- N-Acetylmuramoyl-L-alanine Amidase
(metabolism)
- RNA, Messenger
(genetics)
- Recombinant Proteins
- Sequence Alignment
- Sequence Analysis, DNA
- Staphylococcus aureus
- Zinc
(metabolism)
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