Abstract
The release of granulysin, a 9-kDa cationic protein, from lysosomal granules of cytotoxic T lymphocytes and natural killer cells plays an important role in host defense against microbial pathogens. Granulysin is endocytosed by the infected target cell via lipid rafts and kills subsequently intracellular bacteria. The mechanism by which granulysin binds to eukaryotic and prokaryotic cells but lyses only the latter is not well understood. We have studied the effect of granulysin on large unilamellar vesicles (LUVs) and supported bilayers with prokaryotic and eukaryotic lipid mixtures or model membranes with various lipid compositions and charges. Binding of granulysin to bilayers with negative charges, as typically found in bacteria and lipid rafts of eukaryotic cells, was shown by immunoblotting. Fluorescence release assays using LUV revealed an increase in permeability of prokaryotic, negatively charged and lipid raft-like bilayers devoid of cholesterol. Changes in permeability of these bilayers could be correlated to defects of various sizes penetrating supported bilayers as shown by atomic force microscopy. Based on these results, we conclude that granulysin causes defects in negatively charged cholesterol-free membranes, a membrane composition typically found in bacteria. In contrast, granulysin is able to bind to lipid rafts in eukaryotic cell membranes, where it is taken up by the endocytotic pathway, leaving the cell intact.
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Acknowledgement
We are grateful to A. Vogetseder and M. Le Hir for critical discussion of the manuscript, G. Barmettler for excellent technical help and M. Scott of the Functional Genomics Center at the University of Zurich for help during experiments using a Biacore (Uppsala, Sweden). We thank the Rudolf and Fridl Buck Foundation for financial support.
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Barman, H., Walch, M., Latinovic-Golic, S. et al. Cholesterol in Negatively Charged Lipid Bilayers Modulates the Effect of the Antimicrobial Protein Granulysin. J Membrane Biol 212, 29–39 (2006). https://doi.org/10.1007/s00232-006-0040-3
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DOI: https://doi.org/10.1007/s00232-006-0040-3