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Updated: Aug 24, 2026
Functional Characterization of Carboxylesterases in Insecticide Resistant House Flies, Musca Domestica
Published on: August 23, 2018
[Analysis of antibacterial-relative proteins and peptides in housefly larvae]
Chunju An1, Desen Li, Rongqian Du
1College of Life Science, Nankai University, Tianjin 300071, China.
Objective:
To study the antibacterial-relative proteins and peptides in housefly larvae.
Methods:
Third-instar larvae of housefly were treated with different methods including pricking, pricking with bacteria, heating and ultrasonication and were extracted respectively after 6 h, 16 h, 24 h, 48 h, 65 h. After liquid phase assay, the antibacterial-relative proteins and peptides were confirmed with stepwise regression analysis.
Results:
The four treatments could all induce antibacterial substances. Among these induced proteins, X17 (20 kDa), X16 (22 kDa) had activity against Staphylococcus aureus and Bacillus subtilis, but X22 (13 kDa), X20 (16 kDa), X12 (26 kDa) had activity only against either Staphylococcus aureus or Bacillus subtilis. X7 (37 kDa), X5 (44 kDa) had negative contribution to antibacterial activity.
Conclusion:
Many antibacterial-relative proteins and peptides which cooperate and establish a whole resisting system will begin to be translated or be translated more.
Insights
Housefly larvae produce antibacterial proteins and peptides in response to various stimuli. These substances, including X17 and X16, exhibit activity against bacteria like Staphylococcus aureus and Bacillus subtilis.
Area of Science:
- Insect immunology
- Antimicrobial peptides
- Larval defense mechanisms
Context:
- Housefly larvae (Musca domestica) are potential sources of novel antimicrobial compounds.
- Understanding insect immune responses is crucial for discovering new therapeutic agents.
Purpose:
- To investigate the antibacterial proteins and peptides synthesized by housefly larvae.
- To characterize the antibacterial activity of induced substances against specific bacterial pathogens.
Summary:
- Housefly larvae were subjected to pricking, bacterial challenge, heating, and ultrasonication to induce antibacterial substances.
- Proteins X17 (20 kDa) and X16 (22 kDa) demonstrated activity against Staphylococcus aureus and Bacillus subtilis.
- Other identified proteins showed selective or no antibacterial activity, indicating a complex defense system.
Impact:
- Identifies specific antibacterial proteins from housefly larvae with potential applications.
- Highlights the cooperative nature of insect immune responses for developing novel antimicrobials.
