A Study on the Importance of Phenylalanine for Aurein Functionality

Author(s): Sarah R. Dennison, Frederick Harris, David A. Phoenix.

Journal Name: Protein & Peptide Letters

Volume 16 , Issue 12 , 2009

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Abstract:

Aurein 2.5 (GLFDIVKKVVGAFGSL-NH2) is an amphibian antimicrobial peptide. Here, characterisation studies showed the peptide to exhibit molecular areas at an air / water interface (1.77 - 3.1 nm2), which are in agreement with the adoption of α-helical structures. Lipid monolayer studies showed aurein 2.5 to induce maximal surface pressure changes of circa 7 mN m-1 in monolayers formed from phosphatidylglycerol (PG) and circa 6 mN m-1 in those formed from phosphatidylethanolamine (PE). These data indicate that the membrane interactions of the peptide are amphiphilicity driven with no apparent electrostatic requirement. Individually mutating the phenylalanine residues of aurein 2.5 to leucine had no major effect on the levels of PG and PE interactions, suggesting that these residues are not essential to the membrane interactions of the peptide, contrasting to other aureins where corresponding phenylalanine residues are required for efficient membrane interaction and antibacterial activity. This difference in the requirement is suggested to relate to the surface architecture as proposed by the concept of the molecular perturbation potential.

Keywords: Antimicrobial peptide, Hydrophobic groove, Peptide monolayer, Peptide-lipid interactions

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Article Details

VOLUME: 16
ISSUE: 12
Year: 2009
Page: [1455 - 1458]
Pages: 4
DOI: 10.2174/092986609789839340
Price: $58

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