Abstract
Myelin basic protein derived from bovine spinal cord has been interacted with liposomes of varying brain lipid compositions. The effects of salt and protein concentration on liposome cross linking has been investigated. It appears that myelin basic protein cannot link liposomes composed of brain-derived phosphatidyl choline. Myelin basic protein can link liposomes composed of phosphatidyl serine; phosphatidyl serine + cholesterol; phosphatidyl serine + cholesterol + cerebroside sulphate. Linking of liposomes occurs at protein concentrations lower than those required for myelin basic protein dimers to be formed. Therefore, it seems that the monomeric form of myelin basic protein links lipid bilayers. The presence of cholesterol in the bilayer increases the ability of myelin basic protein to aggregate such liposomes compared with the linking ability of the polycationic polypeptide, poly-l-lysine.
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