Molecular interactions of peptides with phospholipid vesicle membranes as studied by fluorescence correlation spectroscopy - PubMed (original) (raw)
Molecular interactions of peptides with phospholipid vesicle membranes as studied by fluorescence correlation spectroscopy
A Pramanik et al. Chem Phys Lipids. 2000 Jan.
Abstract
Interactions of the peptides melittin and magainin with phospholipid vesicle membranes have been studied using fluorescence correlation spectroscopy. Molecular interactions of melittin and magainin with phospholipid membranes are performed in rhodamine-entrapped vesicles (REV) and in rhodamine-labelled phospholipid vesicles (RLV), which did not entrap free rhodamine inside. The results demonstrate that melittin makes channels into vesicle membranes since exposure of melittin to vesicles causes rhodamine release only from REV but not from RLV. It is obvious that rhodamine can not be released from RLV because the inside of RLV is free of dye molecules. In contrast, magainin breaks vesicles since addition of magainin to vesicles results in rhodamine release from both REV and RLV. As the inside of RLV is free of rhodamine, the appearance of rhodamine in solution confirms that these vesicles are broken into rhodamine-labelled phospholipid fragments after addition of magainin. This study is of pharmaceutical significance since it will provide insights that fluorescence correlation spectroscopy can be used as a rapid protocol to test incorporation and release of drugs by vesicles.
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