Membrane-bound basic peptides sequester multivalent (PIP2), but not monovalent (PS), acidic lipids.

Biophysical Journal
Urszula GolebiewskaStuart McLaughlin

Abstract

Several biologically important peripheral (e.g., myristoylated alanine-rich C kinase substrate) and integral (e.g., the epidermal growth factor receptor) membrane proteins contain clusters of basic residues that interact with acidic lipids in the plasma membrane. Previous measurements demonstrate that the polyvalent acidic lipid phosphatidylinositol 4,5-bisphosphate is bound electrostatically (i.e., sequestered) by membrane-adsorbed basic peptides corresponding to these clusters. We report here three experimental observations that suggest monovalent acidic lipids are not sequestered by membrane-bound basic peptides. 1), Binding of basic peptides to vesicles does not decrease when the temperature is lowered below the fluid-to-gel phase transition. 2), The binding energy of Lys-13 to lipid vesicles increases linearly with the fraction of monovalent acidic lipids. 3), Binding of basic peptides to vesicles produces no self-quenching of fluorescent monovalent acidic lipids. One potential explanation for these results is that membrane-bound basic peptides diffuse too rapidly for the monovalent lipids to be sequestered. Indeed, our fluorescence correlation spectroscopy measurements show basic peptides bound to phosphatidylcholine/phos...Continue Reading

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Citations

Oct 13, 2006·Pflügers Archiv : European journal of physiology·Tibor Rohacs
Jan 28, 2012·Journal of the American Chemical Society·Yu-Hsiu WangPaul A Janmey
Jul 22, 2008·Nature Chemical Biology·Rémi LasserreHai-Tao He
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Feb 8, 2008·Molecular Biology of the Cell·Urszula GolebiewskaStuart McLaughlin
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