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Lentivirus lytic peptide 1 perturbs both outer and inner membranes of Serratia marcescens
Shruti M Phadke1, Vanja Lazarevic, Caroline C Bahr
1Department of Pediatrics, Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.
Abstract:
Bis-lentivirus lytic protein 1 (Bis-LLP1) and polymyxin B exhibited similar killing activities against Serratia marcescens. By electron microscopy, bis-LLP1 interacted with the outer and cytoplasmic bacterial membranes, while polymyxin B affected only the outer membrane. The results of standard biochemical probes supported the findings of the electron microscopy studies, suggesting that these antimicrobial peptides have different mechanisms of action.
Insights
Bis-lentivirus lytic protein 1 (Bis-LLP1) and polymyxin B show similar antibacterial effects against Serratia marcescens. However, Bis-LLP1 targets both outer and cytoplasmic membranes, unlike polymyxin B which only affects the outer membrane, indicating distinct antimicrobial mechanisms.
Area of Science:
- Microbiology
- Biochemistry
- Molecular Biology
Background:
- Antimicrobial peptides are crucial in combating bacterial infections.
- Serratia marcescens is an opportunistic pathogen requiring effective treatment strategies.
- Understanding the mechanisms of action of antimicrobial agents is vital for developing new therapies.
Purpose of the Study:
- To compare the antibacterial activity and mechanisms of action of Bis-lentivirus lytic protein 1 (Bis-LLP1) and polymyxin B against Serratia marcescens.
Main Methods:
- Comparative analysis of killing activities against Serratia marcescens.
- Electron microscopy to visualize bacterial membrane interactions.
- Biochemical probes to confirm membrane targeting.
Main Results:
- Bis-LLP1 and polymyxin B demonstrated comparable killing efficacy against Serratia marcescens.
- Electron microscopy revealed Bis-LLP1 interacts with both outer and cytoplasmic membranes.
- Polymyxin B was observed to affect only the outer membrane of Serratia marcescens.
- Biochemical probes corroborated the distinct membrane interaction sites.
Conclusions:
- Bis-lentivirus lytic protein 1 and polymyxin B possess different mechanisms of action against Serratia marcescens.
- Bis-LLP1's dual membrane targeting suggests a broader spectrum or different mode of action compared to polymyxin B.