Title: Antibiotic activities of host defense peptides: More to it than lipid bilayer perturbation
Authors: Wilmes, M. ×
Cammue, Bruno
Sahl, H.-G.
Thevissen, Karin #
Issue Date: 2011
Publisher: Royal Society of Chemistry
Series Title: Natural Product Reports vol:28 issue:8 pages:1350-1358
Abstract: Defensins are small basic amphiphilic peptides (up to 5 kDa) which have been shown to be important effector molecules of the innate immune system of animals, plants and fungi. In addition to immune modulatory functions, they have potent direct antimicrobial activity against a broad spectrum of bacteria, fungi and/or viruses which makes them promising lead compounds for the development of next-generation antiinfectives. The mode of antibiotic action of defensins was long thought to result from electrostratic interaction between the positively charged defensins and negatively charged microbial membranes followed by unspecific membrane permeabilization or pore-formation. Microbial membranes are more negatively charged than human membranes, which may explain to some extent the specificity of defensin action against microbes and associated low toxicity for the host. However, research during the past decade has demonstrated that defensin activities can be much more targeted and that microbe-specific lipid receptors are involved in the killing activity of various defensins. In this respect, human, fungal and invertebrate defensins have been shown to bind to and sequester the bacterial cell wall building block lipid II, thereby specifically inhibiting cell wall biosynthesis. Moreover, plant and insect defensins were found to interact with fungal sphingolipid receptors, resulting in fungal cell death. This review will summarize the current knowledge on the mode of action and structure of defensins from different kingdoms, with specific emphasis on their interaction with microbial lipid receptors.
ISSN: 0265-0568
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre of Microbial and Plant Genetics
× corresponding author
# (joint) last author

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