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Antimicrobial and conformational studies of the active and inactive analogues of the protegrin-1 peptide
The natural antimicrobial cationic peptide protegrin-1 displays a broad spectrum of antimicrobial activity and rapidly kills pathogens by interacting with their cell membrane. We investigated the structure-activity relationships of three protegrin-1 analogues: IB-367 (RGGLCYCRGRFCVCVGR-NH₂), BM-1 (R...
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Published in: | The FEBS journal 2010-02, Vol.277 (4), p.1010-1022 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The natural antimicrobial cationic peptide protegrin-1 displays a broad spectrum of antimicrobial activity and rapidly kills pathogens by interacting with their cell membrane. We investigated the structure-activity relationships of three protegrin-1 analogues: IB-367 (RGGLCYCRGRFCVCVGR-NH₂), BM-1 (RGLCYCRGRFCVCVG-NH₂) and BM-2 (RGLCYRPRFVCVG-NH₂). Our antimicrobial and antifungal activity studies of these peptides showed that BM-1 was much more active than IB-367 against Gram-positive bacteria and fungi, whereas BM-2 was inactive. The BM-1 peptide showed fourfold reduced haemolysis relative to IB-367, an additional advantage of this peptide. In addition, BM-1 was about 15% cheaper than IB-367 to synthesize. The absence of two cysteine residues in the BM-2 sequence could be the main reason for its unstable conformation and antimicrobial inactivity. The solution structures of these peptides were determined in dimethyl sulphoxide using two-dimensional NMR and restrained molecular dynamics calculations. IB-367 and BM-1 formed short, antiparallel, β-hairpin structures connected by a type II′β-turn. The shorter, inactive BM-2 analogue exhibited major and minor conformations (predominantly unordered) in the NMR spectra and was much more flexible. |
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ISSN: | 1742-464X 1742-4658 |
DOI: | 10.1111/j.1742-4658.2009.07544.x |