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Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
Published on: May 4, 2018
Hp1404, a new antimicrobial peptide from the scorpion Heterometrus petersii
Zhongjie Li1, Xiaobo Xu1, Lanxia Meng1
1State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, PR China.
Abstract:
Antimicrobial peptides have attracted much interest as a novel class of antibiotics against a variety of microbes including antibiotics resistant strains. In this study, a new cationic antimicrobial peptide Hp1404 was identified from the scorpion Heterometrus petersii, which is an amphipathic α-helical peptide and has a specific inhibitory activity against gram-positive bacteria including methicillin-resistant Staphylococcus aureus. Hp1404 can penetrate the membrane of S. aureus at low concentration, and disrupts the cellular membrane directly at super high concentration. S. aureus does not develop drug resistance after multiple treatments with Hp1404 at sub MIC concentration, which is possibly associated with the antibacterial mechanism of the peptide. In addition, Hp1404 has low toxicity to both mammalian cells (HC₅₀ = 226.6 µg/mL and CC₅₀ > 100 µg/mL) and balb-c mice (Non-toxicity at 80 mg/Kg by intraperitoneal injection and LD₅₀ = 89.8 mg/Kg by intravenous injection). Interestingly, Hp1404 can improve the survival rate of the MRSA infected balb-c mice in the peritonitis model. Taken together, Hp1404 may have potential applications as an antibacterial agent.
Insights
A novel scorpion-derived antimicrobial peptide, Hp1404, effectively targets Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA). This peptide shows low toxicity and prevents resistance development, indicating its potential as a new antibiotic agent.
Area of Science:
- Biochemistry
- Pharmacology
- Microbiology
Background:
- Antimicrobial peptides (AMPs) are a promising class of antibiotics against resistant microbial strains.
- Scorpion venom is a rich source of bioactive compounds, including potential antimicrobial agents.
Purpose of the Study:
- To identify and characterize a novel antimicrobial peptide from the scorpion Heterometrus petersii.
- To evaluate the efficacy and safety of the identified peptide, Hp1404, against Gram-positive bacteria, particularly methicillin-resistant Staphylococcus aureus (MRSA).
Main Methods:
- Identification and structural analysis of Hp1404 from scorpion venom.
- In vitro assays to determine antibacterial activity, membrane disruption, and drug resistance potential.
- In vitro toxicity assays on mammalian cells and in vivo toxicity and efficacy studies in mice.
Main Results:
- Hp1404 is an amphipathic α-helical peptide with specific inhibitory activity against Gram-positive bacteria, including MRSA.
- The peptide disrupts the bacterial membrane and does not induce drug resistance in S. aureus.
- Hp1404 exhibits low toxicity to mammalian cells and mice, and improves survival rates in a murine peritonitis model.
Conclusions:
- Hp1404 demonstrates potent antibacterial activity against MRSA with a unique mechanism of action.
- The peptide's low toxicity and lack of resistance development suggest its potential as a therapeutic agent.
- Hp1404 represents a promising candidate for the development of novel antibacterial drugs.
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