Studies of the mechanism of an antibacterial peptide (cecropinA-magainin) on methicillin-resistantStaphylococcus aureusmembranes
| Autor: | Xiangjun Chen, Mingxing Zhu, Erqiang Liu, Tiantian Yang, Longmei Yu, Xiuqing Wang |
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| Rok vydání: | 2015 |
| Předmět: |
0301 basic medicine
030106 microbiology Biomedical Engineering Bioengineering Peptide Bioinformatics medicine.disease_cause Applied Microbiology and Biotechnology Bacterial cell structure Microbiology Cell membrane 03 medical and health sciences chemistry.chemical_compound Minimum inhibitory concentration Drug Discovery medicine Peptide sequence chemistry.chemical_classification Chemistry Process Chemistry and Technology Magainin General Medicine medicine.anatomical_structure Staphylococcus aureus Molecular Medicine Bacterial outer membrane Biotechnology |
| Zdroj: | Biotechnology and Applied Biochemistry. 63:805-811 |
| ISSN: | 0885-4513 |
| DOI: | 10.1002/bab.1429 |
| Popis: | As bacterial resistance becomes increasingly common, a new hybrid peptide, cecropinA-magainin (KWALSKEGPGKFLGKKKKF), has been developed that can kill a broad spectrum of bacteria without damaging human cells. The mechanism of antibacterial toxicity for the hybrid peptides is unknown. Herein, we investigate the localization of the hybrid peptide in methicillin-resistant Staphylococcus aureus (MRSA). The minimum inhibitory concentration was 64 µg/mL. The hybrid peptides could enhance the hydrophobicity of MRSA. Dye leakage experiments showed that the hybrid peptides caused dye leakage from liposomes. The hybrid peptides influenced the permeability of the outer membrane and plasma membrane of MRSA. After cecropinA-magainin treatment of MRSA, the membrane ultrastructure was damaged and the concentration of K+ increased. Ultimately, the peptide destroyed the integrity of the bacterial cell membrane, allowing the dye propidium iodide to enter the cytoplasm. Therefore, the hybrid antibacterial peptide can kill MRSA. |
| Databáze: | OpenAIRE |
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