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Zoekopdracht: faculteit: "ACTA" en publicatiejaar: "2009"

AuteursE.F. Haney, K. Nazmi, F. Lau, J.G.M. Bolscher, H.J. Vogel
TitelNovel lactoferrampin antimicrobial peptides derived from human lactoferrin
SamenvattingHuman lactoferrampin is a novel antimicrobial peptide found in the cationic N-terminal lobe of the iron-binding human lactoferrin protein. The amino acid sequence that directly corresponds to the previously characterized bovine lactoferrin-derived lactoferrampin peptide is inactive on its own (WNLLRQAQEKFGKDKSP, residues 269–285). However, by increasing the net positive charge near the C-terminal end of human lactoferrampin, a significant increase in its antibacterial and Candidacidal activity was obtained. Conversely, the addition of an N-terminal helix cap (sequence DAI) did not have any appreciable effect on the antibacterial or antifungal activity of human lactoferrampin peptides, even though it markedly influenced that of bovine lactoferrampin. The solution structure of five human lactoferrampin variants was determined in SDS micelles and all of the structures display a well-defined amphipathic N-terminal helix and a flexible cationic C-terminus. Differential scanning calorimetry studies indicate that this peptide is capable of inserting into the hydrophobic core of a membrane, while fluorescence spectroscopy results suggest that a hydrophobic patch encompassing the single Trp and Phe residues as well as Leu, Ile and Ala side chains mediates the interaction between the peptide and the hydrophobic core of a phospholipid bilayer.
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